Guide Numbers and Watt Seconds - Flash Photography Tutorial #3
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- เผยแพร่เมื่อ 11 ก.ค. 2024
- In this Part 2 of the Speedlights vs. Monolights battle, we are going to compare Guide Number and Watt Seconds as a way of rating the power of your off camera flash. We are also going to discuss the recycle times of speedlights and monolights.
Monolights are routinely much more powerful than speedlights, because they are larger and able to generate and use more power. Unfortunately, it is VERY difficult to compare them accurately. The reason for that is that Speedlight manufacturers use a method of comparison called guide number which tells you very little about the actual power of your flash and monolight manufacturers use watt seconds for comparison.
Guide number measures the light that is reaching your subject. And watt seconds measures the power that the unit is able to deliver to the flash tube. Two completely different measurements.
But that’s just the beginning of the difficulty… Let’s start with Guide Numbers.
The way to calculate a flash's Guide Number is to multiply the distance x the f/stop. This of course is based on a manual setting at full power and an ISO of 100. Here is an example…. If your flash is 10 feet from your subject and you need an aperture of f/8 to get a properly exposed image - the flash's guide number is 80.
The problem with Guide numbers is that a lot manufacturers measure their guide number with the flash zoomed out to its tightest angle of view - which indeed does measure the most amount of light that the flash can create. But in practice - you probably won’t use your flash nearly as much zoomed in as you will zoomed out and since different strobes zoom to different lens equivalents you wind up comparing apples - to apples - to apples.
Monolight manufacturers don’t make it any easier to compare. Monolights and studio strobes are compared by a metric called watt seconds.
This number is even more unreliable because the measurement of watt seconds is simply how much energy the flash stores and makes available to the capacitor to power the flash tube. It is an unreliable number because different flash tubes have different energy efficiencies as do different reflectors.
In my opinion, the recycle time of a flash is the second most important factor for most people in deciding to go with a Speedlite or monolight.
In this video, I will use a Flashpoint320M Monolight and a LumoPro 180R Speedlight to show you the basic differences between the two types of flash units.
PRODUCTS MENTIONED
Flashpoint 320M 150ws Monolight - amzn.to/2bJASeQ
LumoPro 180R Speedlight - amzn.to/2bEsxu2
Flashpoint Zoom TTL R2 Flash With Integrated R2 Radio Transceiver amzn.to/2bIFwKV
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#GuideNumber #WattSeconds #flashphotography - แนวปฏิบัติและการใช้ชีวิต
I love how you refuse to pick the best. It's what you need. Finally. A sensible discussion.
Thanks for noticing that Robert Miller!
I spent a year planning out my camera upgrade based on the ability to have better high iso performance, better frame rate, and all the stuff other photographers I was following seemed to care about., What I really needed was better glass and a better lighting system. Found you a little too late .Glad to have this channel as a resource.
Finally I found a simple explanation about the watt per seconds from studio strobes. Great video, as a lot of your videos are. I learn a lot from them. So remember, your next video is your best video. So keep filming, keep posting and stay teaching.
LOL - thank you pdebie1982!
I've just find your channel. It is exactly what I was looking for, clear explanations, good examples; very useful. Thank you so much!
The best instructor I found on youtube!!
Thank you so much for the very kind words pp pp!
Great as always. Lots of information, easily understood, and helpful for making decisions on equipment. Thanks so much!
Joe, you are the best :) Thanks again, each and every video of yours is always simple yet informative.
Joe, love your videos, clear concise and to the point. I think your style is awesome and your way of conveying the details and facts about Speedlite flash units and monolights are spot on. Will watch all your videos. Great work!
Thanks Pieter Roelofse and THANKS for subscribing - great to have you along for the ride!
I've loved the Off-camera flash series, Joe! Thanks so much!
Thanks Joe
I really appreciate your straight forward approach - I’ve learned a lot from you- keep up the great work
I watched parts one and two and I found them very helpful -- even though I have been researching lights for many weeks! You present a clarity of thought and decision making that clears the fog. Thanks!
Thank you Art Altman! I really appreciate the kind words!
Another well produced video with all the essential info for anyone starting out with speedlights/speedlite or strobes!
Thank you for the kind words Abe .M. Essack ! Be sure to subscribe so that you don't miss any videos!
When I started photography back in the early 90s, the feature that most persuaded me to buy studio/mono lights was the modelling light where you could see where the light and shadows would fall. Those were the days where we still used 35mm film cameras and could not accurately check of how the photos would turn out before you had your film developed and printed unless you owned an expensive medium format camera with a Polaroid back. Today with digital cameras were you can instantly check your result does not make modelling light a necessity, in fact some reviewers of monolights don't seem to give this feature any importance anymore. In view of this I do think that for starting photographers, speedlights work just fine, they are inexpensive and relatively easy to use and a great way to experiment and understand how light and shadow work.
Thanks for commenting Stephen Cutajar!
This is way way way tooooo helpful... I was looking to understand monolights and speedlights better, and this series of videos have helped me get a pretty good understanding of it... Thanks a ton!!!!...
Hands down. You are one of the best. Precision, clarity and facts. I love you man. Live long and pass such rich knowledge and experience. Greetings from Ghana - Africa
Thank you so much for the kind words Gideon Highlander Studios ! I really appreciate it!
Good info. Don't forget to factor in your modifier of choice when determining your power needs.
So far you have the best explanations for these things in this media. pls do more lessons. thanks
Wow!!! Your videos are so detailed and easy to understand. One of the best videos on lights. Love it! Thank you so much!
Joe, once more: Awesome!
And certainly an unbelievably huge pre-production workload scraping out all the specs, then breaking them down to/pouring into a no-fluff concept, then outlining a concise (and meaningful) presentation. Plus recording a few takes. Plus editing & imposing work.
In short: THANK YOU!
Dan Hostettler are you implying I am not capable of getting it right in the first take? 😜😎
LOL. At least me when doing some shots (with a prompter!) I need a few takes. But you, being such an experienced pro, I am sure this works like a charm in one shot for you :)
Keep them coming 8)
Love your videos Joe. Your plain and simple explaination of the topics you cover is awesome!!
Thank you for the kind words David Blocher and THANKS for subscribing - great to have you along for the ride!
Thank you, this is one of the best videos on this subject!
Wow!!! Thank you for the very thorough, understandable and useful information, Joe.
Thank you for the kind words blueridgepics ! Be sure to subscribe so that you don't miss any videos!
Most of the things explained in this tutorial are new to me. It's all so interesting. I always wondered what "GN" meant for my Yongnuo 565EX and I am sure that even if I had Googled it... I wouldn't have understood like I did with this tutorial. I will definitely try adjusting my exposure according to the GM and will try to learn how it is done. I do own a Yongnuo TTL flash and a set of radio triggers, but I find it so difficult to understand how "correct" flash exposure should be set and also...the "uselessness" of a direct bare flash makes it well...useless. I can't carry around soft boxes and umbrellas. All that is for pros. I am just a hobbyist and the science of current digital photography fascinates me.
Thank you so very much for another brilliant tutorial. I have learnt a lot from it.
Always love your videos, particularly your instructions, easy to follow and full of knowledge. Thanks!
Glad you enjoy them Peter Kaltoft! Thank you so much for the kind words!
thank you for your words sir, I have been so hesitant on purchasing any sort of lighting. you are amazing.
Thank you Kyle! I really appreciate the kind words!
Really good tutorial, you explain things so naturally :)
Thank you MrDeetay25! I really appreciate the kind words!
Your stuff is great, Joe. I'm an older guy (43yo) and I'm trying to get serious about this and turn it into a business. The expense of some of the equipment is rather daunting, and I came to see if I really need to invest in monolights at this point. I've learned to accomplish quite a bit with speedlights. After your advice, I think I'll stick with them for the time being. I really appreciate your tutorials and all the information you share. I am a fan.
Joe, this shit is indispensable. It's clear, comprehensive and entertainingly delivered. Top marks.
Thanks for the breakdown regarding the specs surrounding moonlights vs speed lights. Great tutorial.
Glad you enjoyed it Jacqueline Hotard! I appreciate the comment!
Thanks for this series it's been very informative and useful to me. Nearly 2 yrs ago I bought 4 cheap yongnuo 560-III speed lights along with the 560 TX trigger and I haven't looked back. I've not had a single misfire in over 1000 shots with one exception the operator (me) had the wrong group set. They're perfect for what I do and if I need more power I just mount 2 or 4 together to pick up an extra stop or two. I've added a couple of cheap battery packs and while I've never counted the shots I can get it has to be way up there since I seldom shoot at full power. I know I've never run out battery power.
Anyway thank you for sharing your expertise and knowledge of photography.
Thanks Jack and THANKS for subscribing - great to have you along for the ride!
the whole chunnel, great bite sized tips, I'm gonna try basically everyone of them, cheera Joe, great job
Thank you for the kind words Vittorio Sergi ! Be sure to subscribe so that you don't miss any videos!
Great advice, as always. Thanks Joe.
Thanks for this video, Joe! I have 1 Godox 300 ws strobe with Bowens Mount which I rarely use in my small studio. It is just too powerful even on the lowest setting. But the 2 Youngnou YN568 exII ETTL speedlights(Gn58) with 622c tx radiotriggers(ETTL/Manual) and the YN560(Gn58?) and YN460 (Gn30?) manual speedlights with the YN603c manual triggers are used all the time. The 2 first speedlights also follow me on travels. So I know for sure that it's very easy to buy too big and expensive for your needs if you are new to strobes.
Hey. Great review, both parts are really informative, easy to understand when you trying to decide what type of flash is possible to buy, what do you need to consider and all other stuff. I was totally newbie about flash units, now after found your videos, I can decide and understand what do I need. Thanks a lot!
Thank you Tomas Ivoška! I really appreciate the kind words!
Wow, a proper video series worth watching and subscribing, one that is not "all about me"... but goes straight to the message and provides solid information. If I ever want to start a youtube channel yours would be the one I emulate, I am Impressed and offer my gratitude by swiping over to patreon.
Thank you so much for your support T White (Porthos) and THANKS for subscribing - great to have you along for the ride!
Great lesson Joe. Now I know what really need to me. I save money to very expensive strobe but now I could save buying a half cheep for my needs. Thumbs up
Thank you Skirmantas Rinkevicius!
Good stuff as always, Joe.
I found these two videos regarding Speedlight vs Strobe extremely helpful and enlightening (pun intended). Thanks, Joe!
Awesome! Gad they helped Michael Ellingson and THANKS for subscribing - great to have you along for the ride!
Very much enjoy all your videos. Thank you for producing them, much to be learned from them.
FYI fun fact: The etymology of anxious is from the Latin word angere, anguere "choke, squeeze", thus the word anxious has a scary beginning. Also, Latin anxius refers to "uneasy, troubled in mind, anxiety, and the like". In addition, anxiety ultimately comes from the Latin angō, which means “I cause physical pain” or “I torment, trouble, vex, or distress. Thus anxious and eager are at polar opposites. Hope you enjoyed the anxious fun fact.
Oh, enjoyed your egg video as well, and I am looking forward to seeing your next video.
Cordially and respectfully submitted.
Glad you enjoyed it Ric Donato! Thanks for sharing the "UselessKnowledge"! I appreciate the comment! Now here is my fun fact... look up UselessKnowledge on Amazon.com and see what you find...
Love it! Now I must order one of those books adding it to my collection! In that genre I own numerous books, such as Horsefeathers & other curious words, Everything you know is wrong, Fabulous Fallacies, Why do we say it, and many others. To me stuff as that is funny, informative, interesting, and sometimes challenges what we have been taught. Sharing "Uselessknowldge" gets camera shy clients laughing, and thinking of something other than their nervousness. Often they share their own Uselessknowledge; helps make a good rapport.
Thank you for sharing the UselessKnowledge books; oh-my they must be a hoot. Pleased to hear back from you.
Cordially,
RicD
Your tips are simply awesome!
Thanks Gabriel Galvão and THANKS for subscribing - great to have you along for the ride!
+Joe Edelman You can count on me, Joe! I'm a fan of your work!
This was a very good educational tutorial. and Thank You!
Thank you for the kind words Divus iulius ! Be sure to subscribe so that you don't miss any videos!
oh & i truly appreciate your passion which comes across !
Thanks for commenting Dhiraj Shetty!
EXCELLENT presentation and VERY Informative!
I appreciate your kind words and comments Jose Aragon!
Thanks Joe, big help. Thumbs up...
Love your work!
Thanks estebanisswimming and THANKS for subscribing - great to have you along for the ride!
I love your video's and the fantastic information you provide. Thank you so much!!
Thanks Ken Dunlop and THANKS for subscribing - great to have you along for the ride!
You're a great educator! Relevant, succinct, info packed, clear presentations!
You should issue books! Have a writer transcribe points from your videos, you then fill in the gaps, add more info and structure the flow of the book.
Leave legacies for the photography community!
lol - thank you puny punny. Books are soooo last century. Videos will last longer. 😎
I'd say flash triggers are a must. I certainly feel as those my photography has improved greatly very recently because I took more control of my lighting (I've also been shooting much more regularly which helps too). If you're just starting out and can't afford flashes, triggers, soft boxes and the rest of it, you can still achieve great images just by being creative with natural lighting and something to reflect light like foil or white card.
Great video Joe, I think this should definitely assist in the purchase process of either strobes or flash.
Thanks Dale Brown and THANKS for subscribing - great to have you along for the ride!
You solved all my problems! Thank you soooooo much man!
Glad you enjoyed it Dani VM! I appreciate the comment!
Hey there Joe !! love your videos ! thanks a bunch !
You're very welcome Dhiraj Shetty! Thank you so much for the kind words!
What a great video and channel!!!! Subscribed!!
Thanks Tuzaflip and THANKS for subscribing - great to have you along for the ride!
Awesome Video....... Day by day I am becoming a bigger fan of u....... Wish to learn from u at least once ......
Thank you for the kind words Avijit Roy Chowdhury!
The most useful video on flashes
Awesome Sainadh Nani! Glad you enjoyed it!
Thanks for your video. I use Flashpoint Monoligths (2 620M and 1 320M) for portraits and I am very happy with them, great value for the price. I also use speedligths for outdoors with a DIY power supply made with a 6v gel battery in a very low budget fix
Thanks for sharing Ramón Enrique Méndez Yáñez!
as alway`s it is fun to watch and learn from youre video`s......thank you
Thanks Aiden Beuker and THANKS for subscribing - great to have you along for the ride!
THANK you so much for this amazing comparison ,and all this data very helpful to me and your way to advice is so amazing , happy to find amazing source like you , thank you thank you thank you (Y)
You're very welcome Omar Elkady! Thank you so much for the kind words!
All good educational information Joe.
Thanks Nicholas Fox!
Thanks again Joe great videos and info!
You're very welcome Ronald Rocheleau!
Joe you are a life saver!
Glad it helped Nikesh Murali!
So dope and informative. Thank you very much for your insight!!
You're very welcome HW Photography! Thanks for the kind words!
Thanks for the awesome video Joe!
Just wanted to chime in that as an inexperienced photographer wanting to set up some studio lights for tabletop work, and maybe some portraits at some point, I decided to buy some Pocket Wizards and speedlights.
There are a whack of film camera speedlights that may not be TTL-able at all or with modern cameras for cheap. I bought 4 older flash units - identical, electronic - that let me adjust the power easily, and some older PW Plus II triggers - I think I paid an average of $50CDN for each. Soft umbrellas and stands from the world's internet marketplace, and I have a pretty respectable kit assembled over a period of time. Probably into it for $600 CDN or so now total. That's for 4 speedlights, the PW radio triggers, stands, boxes, umbrellas, brackets etc.... I paid the same for my one OEM dedicated speedlight. Just saying... It is an economical way to get started.
Awesome learning session!!
Thanks for commenting Ismail El-Shalh!
Great tutorials, many thanks! Subscribed indeed :-)
Thanks. Concise and on point.
Many thanks; How helpful and well presented 👏🤗
You're very welcome Isabelle Cleroux! I am glad you enjoyed it!
i love your videos THANK YOU
Glad to have you as a subscriber Nebula Twins Myles and Matthew! Thanks for commenting!
very informative and helpful thank you for your videos.
Thank you ali Alhayaly! I really appreciate the kind words!
Nice video, I enjoy a lot your style, thanks for sharing
You're very welcome Eugenio! I am glad you enjoyed it!
yet another excellent tutorial !! thank you +Joe Edelman
Glad you enjoyed it Dhiraj Shetty! I appreciate the comment!
Thank you Joe... very cool tutorial. I am a strobist very seldom I am in a situation where I use ambient light. My setup includes 3 manual flashes YN560-3 with their controller and a YN468 TTL with a set of ttl transceivers just when i use a single light and im in a hurry ;-)
Thank you for the kind words Frank Nazario ! Be sure to subscribe so that you don't miss any videos!
thumbs up, for this top tips
Thanks Joe for been so informative and entertaining , only recently discovered your Utube channel ,and was amazed at the real amount of useful content freely give compare to other utubers pushing there own products and image, I started using radio controlled yongnuo yn560 for a canon camera , as its my first step into lighting ,I love the freedom and effects I'm getting with my growing understanding of light. my friends are the same so it makes it easier and fun to try different effects and ideas , the only problem I would like to over come is to have my friends with Nikons join in , so my question is, if I get one of those little off camera hot shoes with the old style pc sink cord ,is it possible to use canon controller with Nikon just to fire the flashes and not damage anything. Thanks Henry
Still an excellent video... Good work!
Thank you! Alex Biserchich Glad you enjoyed it!
Thanks for the help
Great info Joe. I recently discovered you and subscribed. Going through your other videos now.
Thanks Dex Pyran and THANKS for subscribing - great to have you along for the ride!
You da man, Joe!
LOL - Thank you! William Fitch Glad you enjoyed it!
Thank you for this video
Thank you for the kind words cain Kuri ! Be sure to subscribe so that you don't miss any videos!
I already subscribe ! your videos are among the best videos of photography... I like your approach of keep shooting... and your style. ^_^ We learn a lot here. Thank you for sharing.
Another great video! Love the how to part! Will you be doing a a video on using gels and colour balance to create warmer or cooler light?
Thank you for the kind words Don Lefresne ! I will be talking about color correction down the road.
Great explanation Joe. I already have 3 Speedlights and wondering whether to invest a monolight. No getting into the research over which brand. BTW.......SUBSCRIBED!
Thanks Paul Humphries and THANKS for subscribing - great to have you along for the ride!
Great Video
Thank you! Caleb Hiers Glad you enjoyed it!
Good information to think about.
Thanks David Centifanto and THANKS for subscribing - great to have you along for the ride!
Thanks a lot for your time and explanation , could you pls make comparisons between Elinchrom light and modifiers vs
Paulcbuff
The brand name and the cost Bilal Izaddin! Glad to have you as a subscriber!
Great video. I would love you to develop more the HSS and what are the advantage of the monolights in HSS.
Thanks Leroy Grégory and THANKS for subscribing - great to have you along for the ride!
Again, great content Joe. Your videos are strong enough to stand on their own (too many tag lines at the end IMHO). Your next shot, could be your best shot! Adios.
Thanks for the feedback dance2jam!
i've used a 320m since 2008. Lotta bang for the buck. My only critique about your vid would be how the different bits of kit work with modifiers.
That one was just part 2 Cecil Sharps - more to come!
Amazing video, thank you Joe. It's January 2018, is there any change in your perception, or your recommendations, in light of new technologies so far?
Another good video. I miss spanish subtitles like the anteriors parts about this topic. But I understood most.
Thanks Emmanuel Peña and THANKS for subscribing - great to have you along for the ride! Subtitles are coming slowly but surely to all my videos. This one is being translated right now - stop back next week and it will be all set-up.
its really helpful
Glad you enjoyed it Vishweshwar Kandalgaonkar! I appreciate the comment!
So guide number can be translated into power of a speed light such as GN60 > than GN 30 that's all i wanted to know & thanks for explaining so much info without wasting a sec
Ok. I've watched a bunch of your vids now and loving them and mentioned them rekindling my interest. Where are you getting your shirts, I love them, lol. You must have a hell of a wardrobe, nearly a new shirt in each video. Are they English Laundry or tailor made perhaps, they seem to be the same brand. Sorry to go off topic, still a compliment all the same.
LOL Tony Bennett - not exactly a new short in each video but I do have a few. Unfortunately the company no longer makes them so I am looking for a new source.
That's why I went with Alien Bee's Digi Bee's cause Paul C Buff has always been very reserved in their power output. So for the money, yeah it's hard for me to justify a ProFoto B1 or D1 setup. Even though I know they are pretty powerful as well if you want the absolute best.
Thanks for commenting Crewchief 227! Please be sure to subscribe so that you don't miss any videos!
thank you very much translate spanish. greetings from Argentina
de nada Alejandro Fernandez! Thank you for watching!
I love the video - very, very clear. Can you help me understand something about my Elinchrom monolight? I have a 400 w/s monolight, and it offers a "5-stop power variability" - on the back of the unit, I can dial in from as low as 2.0 up to 6.0. I'm assuming that's the number of stops of light it provides. But if I get their 100 w/s moonlight, it says it also offers a "5-stop power variability." I was under the impression that stops weren't relative. I understand that the 400 monolight is not necessarily producing a flash that is 4 times stronger than the 100 w/s, given what you've said here - plus there are some other factors, including recycling time. Ultimately, I just need to know, if I had both lights, and set the digital reading to 2.0 on the back, should I expect the same results from each monolight in terms of light output? Is there another factor that I'm missing? Also, if I have the light set to 2.0 and put two stops of diffusion material in front of it, does that neutralize the light? Thanks!!
Thank you Daniel Corey! The variability is within each strobe. So a setting of 2 on the 100ws is not the same as a setting of 2 on the 400ws. If you put a diffuser in front of the 400ws strobe - you could bring it down to the 100ws level or you could just turn down the power. My sincere advice - watch more of my videos - you are approaching lighting like an engineer, Forget the numbers - learn to SEE light and you will find success,
Would you say the flash power of a speedlight is somewhat equal to the flash power of the Flashpoint 150w monolight? I've been using speedlights in softboxes for quite sometime with great results but I wanted to have modeling lights for a more professional appearance. I bought a pair of 400w monolights but they're just too bright for my needs even at their lowest power setting.
Buen día Sr. Joe tendra algún conocimiento del funcionamiento de las Mtl 900 ii? gracias.
Like tutorial btw
oh wow, you are super good in this. Question: I've using somewhat mediocre strobes like Jinbei HD600, I really curious what the real differences is to Profoto which is like 7 times more expensive, everybody says quality of light, but to be honest the times I shot with it, I don't see real differences. So why the heck are people paying those big brands when the differences are subtle.
LOL - it is because they are Zombie Photographers minh tang! Watch this video: th-cam.com/video/V6nuR20hyJU/w-d-xo.html Profoto delivers really pure light in a well built strobe that is grossly overpriced. With the color balancing abilities we have today - if you are not shooting something that requires precision color - there is no reason to use Profoto in my opinion.
As the track photographer for the local NASCAR short track, I"ve been using my Nikon D7000, 18-300 lens, SB910 and a pixel td-382 flash pack. the trouble I'm encountering is at night, even with the high end rechargeable batteries and flash pack, the 910 can't seem to keep up with even the 6fps of the D7000. I'm upgrading to the D500, and am curious as to whether or not you feel that a monolight might offer better performance in keeping up with the 10fps of the D500?
If a monolight might be better suited to my needs, is there one that you can recommend as a starting point? I'd prefer something more portable, as well as suitable for outdoor use.