It's like it's not even there!😯
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- เผยแพร่เมื่อ 16 ก.ค. 2024
- This is my review of the 2x Barlow from Tele Vue. It's my favorite Barlow lens and I think that it’s one of the best you can get. It is compatible with almost every 1.25” eyepiece and telescopes out there and helps get bright and contrast rich views of the night sky.
⬇️ More Information down below ⬇️
More information about this Barlow:
televue.com/engine/TV3b_page....
Buy here (affl): amzn.to/3Q3LnMc
Understanding Eyepieces:
• Understanding Eyepiece...
Thank you for your support! - วิทยาศาสตร์และเทคโนโลยี
I had the televue big barlow and panoptic interface lens back in the day, which made it like a 2x ppwermate. I also had the 2x and 3x, the 2.5x powermate and the 2x powermate. I sold the big barlow a long time ago. I would still have the rest but all my gear was stolen in 2018. They are really nice.
I did find the 2" gso ED barlow to perform close to the big barlow so that is what i have now. I also have a celestron ultima 3 element japanese barlow, an older parks japanese barlow, and a couple gso made shorties for the 1.5x trick, one is an older celestron, and the other is a more recent high point branded one. And also a japanese meade 140 3 element long telenegative amplifier (fancy way to say barlow)
I do have to say thay the 1.25" gso 3x ED barlows are very close to the televue 3x. I had them in my old outreach kit.
My favorite non tv barlow is the ultima, but it does vignette with 23-24mm wide fields, and the tv was long enough not to. My 140 is long enough to not have that problem so I am good. I should probably pick up another 3x ED barlow, but i am in no rush nor am i watching the classifieds.
Between 2006 and 2011 I could get any gso accessories really.cheap since where i worked had our own branding on them, and the wholesale cost was dirt cheap.
I took your advice and picked one up for my telescopes! Thank you Bohdan.
@Leonid Cechmistro That is great! I hope you are going to enjoy the new addition to your collection 🙂
Great Review! Thank you! After watching what you had to say I felt totally confident in purchasing a TeleVue 2x Barlow 1.25" Thank you again Bogdan for sharing your knowledge and options. I enjoy watching your reviews on so many different Astronomy products.
My Tele Vue 2x is the best one I ever tried. I bought a telescope at a pawn shop and the Barlow came with it, it was worth more than the old telescope. I had a Luminos 2x from Celestron already and it is pretty good, but the Tele Vue is a little better, absolutely no dimming and very sharp if seeing conditions are good.
I got this item last year but haven't had an opportunity to use it yet. I'm thinking of getting the Delite 18.2mm to give me 2 useful focal lengths for my C9.25 SCT. I notice the price of this Barlow has gone up over £20 since I bought it so it was a good investment, too.
Televue always make the very best Astronomy-related stuff!
I have just bought a TeleVue 2.0x secondhand and a few months earlier bought a TeleVue 1.8x
I also have a Klee 2.8x and an AstroEngineering 4.0x Imagemate.
The Televue 2x Barlows are the very best barlows!
Love your videos
Ok, I am convinced. I going to pick up the Televue Barlow. If it will truly help my subpar eyepieces look a bit better without darkening, that seems like a great buy!
@Chris Kendrick I believe that's a good choice. Let me know how it works in combination with your eyepieces. Clear skies!
It won't make the eyepiece look better, it just won't degrade the image further. But if you have a fast scope, any decent barlow will improve the edges, since it slows down your scopes focal ratio
If you like your Eyepiece collection, but want to buy a new telescope, a Barlow is the key to not being stuck shopping for scopes of the same f-ratio (ie. 1/2 the f-ratio + 2x Barlow = Comparable views)
Unscrew the bottom of a 2X Barlow lens and screw it to the bottom of any eyepiece and get 1.5X.
But the televue barlows use a different thread, at least they used to when I had them. I always kept a couple gso shorties for this reason
Hi all, have anybody experience with Artesky Telecentric Barlow lens 2x 2" - APO - 4 Element Design?
Call mad but I use a 5x Powermate. I originally bought it for imaging but I found that it combines well with my 24mm and 14mm to give me closeups of the moon and planets. I found along with my 6.7 I have effective lengths of 24, 14, 6.7, 4.8 and 2.8mm. I used the 5x PM to take my profile picture of Saturn :)
@Ishan You are not mad at all 🙂 By the sound of it, it allows for a good focal length spread. It's all that counts. Enjoy using your Powermate. And the picture of Saturn is just awesome 🤩
As long as you aren't using it on eyepieces shorter than 14mm it isn't mad, if your focal ratio is fast enough
Do you think a 5x Barlow/Power lens is worth it if you can just buy an equivalent eyepiece? Just wondering about image integrity as the magnification factor of the Powerlens increases as the limiting factor on image quality is the eyepiece
@Lindile Manzingana If you have a choice whether to reach a certain magnification by using a Barlow lens or just the eyepiece, than always go with the eyepiece. Adding lenses to an optical system will in theory degrade the image. This effect gets stronger the lower the quality of the Barlow/eyepiece is.
Hello, I have a Televue 2x too, but the manual instructions, that usually come with Televue barlows, didn´t come inside the box. Did you find any instructions in your box? Greetings from Spain.
@petrusaroesnosa7461 Hello! Yes, there was a simple sheet of paper inside the box, but I don't think that I have it anymore. You might be able to find a PDF version of it online on televue.com
Amazing content! Subbed✌️
I have a pretty dumb question for you:
I recently bought an 8"/1200 mm Dobsonian that came with 9mm plossl and 30mm erfle eyepeices.
I am considering buying a 2x barlow, and since I have a 2" focuser, I can fit both 1.25" and 2" barlows in it.
Soooo... is there any real downside to buying a 2" barlow (for eg. 2x GSO ED Barlow) as compared to a 1.25" barlow? Or is a 1.25" barlow better?
I couldn't find any good answers online, so some guidance would be greatly appreciated! 🙏
@JPA Hi and thank you for subbing! A 2" Barlow only really makes sense if you are going to use it together with medium to high power 2" eyepieces (82° AFOV). Above this focal length value the eye relief of eyepieces tend to be long. This combined with an additional increase in eye relief from using a Barlow (doesn't matter which kind) might be too much and the views will suffer because of this.
I personally would get a 1.25" Barlow and with the savings maybe also a better high/medium power eyepiece or something else you might need. Hope this helps.
@@BogdanDamian Thank you so much! Clear skies!
Hi Bogdan. Great the videos with lots of information. I'm hoping you could give me some advice. I have just today purchase the Celestron Advanced VX 8 EdgeHD Schmidt-Cassegrain Telescope for a christmas present for my son and i am a complete novice but with interest. I was hoping you could help me choose between the Tele Vue 2x barlow and the Tele Vue 2.0x 2" powermate. If you could also recommend a few eyepieces. I was leaning towards the Tele Vue 2.0x 2" powermate but i'll await your advice. Many thanks. Sorry for the long write up.
@colorfull60 Hi! That's a great Christmas present! Your son will love it. In my opinion a Barlow lens makes the most sense when it comes to planetary observations. In this case you usually use short focal length eyepieces which almost all come in a 1.25" size. Therefore I recommend getting the normal 1.25" 2x Barlow.
As for the eyepieces, I would get a short focal length eyepiece for planetary observations such as the 11mm DeLite from Tele Vue. It will yield a magnification of 181x. Combined with the Barlow you get 362x close to the maximum magnification for the telescope.
And then I would get an eyepiece with a medium focal length. For example the 24mm or 27mm Panoptic from Tele Vue. The 24mm comes with a barrel size of 1.25" and can be combined with the Barlow.
The included 40mm Plössl should be fine for wide field observations. Hope this helps.
Thank you so much Bogdan. This is a great help and i do appreciate it. I knew it wouldn't be of much use to him with the one eyepiece that comes with it. lol. I will order those now. I can't wait to tell him to check your youtube videos and he can get an idea of what the lens can do. Thank you again😊
Salut Bogdan :)
I own a 8" SkyWatcher Newtonian telescop and I really want a decent upgrade in terms of magnification.
The best results I had, were with the original 10mm Plossl eyepiece with which the telescope came and a 25 Euro Barlow 2.5 from GSO to which I am willing to let it go.
I am in search of a good collection of eyepieces including a decent Barlow. I was looking at this TeleVue (the 3x version), however, I don't have the budget for it yet. Instead, I've found something from Lacerta: Tele Extender 3x. This piece has 4 glass elements, however, it is said that it gives good results.
The Lacerta is also cheaper, around $110. Shall I take the Lacerta version or keep saving money for Televue? Will the money difference be worthing in terms of quality?
@ilarion ispas Salut! there a couple of options that can help improve the views at higher magnifications.
1. Short focal length (FL) eyepiece (EP) + Barlow combination: here I would recommend the gold ring from TS-Optics/Omegon/SvBony etc. It's the same design so it shouldn't matter which brand is printed on it. I also have a review on it. As an alternative look into the SWAN series from Omegon. As for the Barlow, I would really get a 2x instead of a 3x for visual observations. It will give you more flexibility and compatibility with other EPs. For the Barlow, it's worth saving up for a 2x Tele Vue in my opinion. There is a significant difference between it and all the others at this price point.
2. Very short FL EP: here the 3mm 52° from Explore Scientific comes to mind.
3. Zoom EP: if your budget is tight and you are just starting to build your EP collection, then getting a Zoom EP like the Hyperion Mark IV Zoom from Baader might be a good idea. You get a very good EP and a lot of FL options in a single EP. Quality wise it's better than the gold ring and on par with the SWAN.
In general good eyepiece series that don't break the bank account are the SWAN series from Omegon and the 52°/62°/68° series from Explore Scientific.
If it were my decision, then I would go with the Baader Zoom, which I would later (in a couple of years) upgrade with dedicated premium fixed LF EP like the ones from Tele Vue.
Hope this helps.
@@BogdanDamian Thank you Bogdan
I highly appreciate your reply, it helped me in making some decisions.
Hi Bogdan. novice question, how would you compare the image quality of a 10mm EP with 2x barlow to a 5mm EP assuming all EPs are of the same quality. i assume they would produce the same magnification, but are there any other differences? thanks a lot
@Yasser Afifi Hi! Generally speaking, by adding extra lenses to the optical system the image quality suffers a little bit. That is why it's so important that the extra lenses added by the Barlow as as perfect as possible. And here comes the 2x Barlow from Tele Vue into play. It's lenses are as perfect as they get without switching to professional gear.
In your example if the Barlow is premium enough, then the image produced by the two eyepieces would be very similar.
If they are both plossls, the 5mm might be technically better without the extra glass, however a 10mm with a barlow is much more comfortable to use than a 5mm.
But 5mm long eye relief, wider field eyepieces are another option.
I was thinking of getting the Tele Vue 2x Barlow lens but the 13mm eyepiece I was going to get from the Delite series has an eye relief of 20mm so I'm not sure if I should get the 2x or save up for the 2.5x Powermate series since the 2.5x Powermate version is more expensive than the 2x. What would be the better option?
@sniperthief1110 I use the 2x Barlow from Tele Vue all the time in combination with the 9mm DeLite and I never had any problems with an over extended eye relief. Go for the 2x Barlow. It will work well with the 13mm DeLite.
@@BogdanDamian Thank you
The eye relief problem does not apply to eyepieces that use negative groups in the barrel.
It applies to panoptics, and more classic scaled.designs like plossls and erfle/widefield types. The original version of the powermate was actually the 2" televue BIG barlow with the addition of the panoptic interface lens, which was go fix the eye relief blackout problem, and was essentially the same as what was later released as the powermate.
It is not needed for naglers, radians, ethos, delos,.delite, lvw, pentax xw, hyperion, morpheus etc...
Does the bottom screw off to make a 1.5x by any chance on the Tele Vue?
@Ghetto Canuck The bottom does unscrew, but you can't reduce the amplification that way. This Barlow is intended only for 2x.
Back when I had then, the thread they use to attach the lenses isn't the same as filter threads.
In theory though, it would work, but it is not threaded to do so. And being a longer barlow it would probably be closer to 1.3x.
But don't try it as you might cross thread it and jam it in an eyepiece.
Just use a more common shorty barlow for the 1.5x trick
on a 1200mm Newtonian what would be better a Barlow or the Powermate?
@Wayne Garrett It depends whether you intend on buying the 1.25" or 2" versions of each type. This is because a Powermate only becomes necessary when using long focal length eyepieces which come in a 2" format. With short focal length eyepieces (< 24mm) a Barlow will be more than enough. If money is no issue, then get a 2" Powermate and eliminate any potential compatibility problems with bigger eyepiece down the road. Hope this helps.
@@BogdanDamian very good point, thank so once again, I habe learnt so much from you and your channel
I'm deciding between the 2x Tele Vue Barlow and Powermate. How much is too much eye relief with the standard Barlow? Your Panoptic 24 has 15mm but increases to 30mm with your Barlow. Is that awkward? I have an eyepiece with 20mm eye relief which would increase to 40mm. Do you think that would be too much? Thanks!
@Dave Hord 30mm of eye relief for the combination 2x Barlow+24mm Panoptic isn't awkward at all. I'm also using this Barlow in combination with my 9mm DeLite and I still don't have any problems. The DeLite has an eye relief of 20mm. So I think that as long your eyepiece with 20mm eye relief doesn't have a very long focal length (>20mm), then you should be fine with the 2x Barlow.
@@BogdanDamian Thank you. I'm picking up my new 10 inch F6 Dob (fl 1524 mm) and am trying to put together a selection of Tele Vue eye pieces to give me proper magnifications and good fields of view. Was planning on a Barlow or Powermate as part of the selection.
@Dave Hord Sounds great! A combination of DeLites/Panoptics for high and medium power observations (+ 2x Barlow) and a Nagler for low power observations will work great together with your new Dob. Clear skies!
@@BogdanDamian Just curious as to your thinking of the DeLites over the Delos or Ethos for this combination. I don't think you can go wrong with any TV EP. The Delos has the same ER with 72 degrees AFOV vs 62 for DeLites. A highly respected member on the Cloudy Nights forum describes the DeLites as the "closest to perfect" EP in the TV lineup. Have you been able to compare the three? Thanks in advance! Love your channel and your advice.
@Brian Hart Thank you very much! In my opinion the TV DeLite is one of the best EP on the market especially for planetary observations. I also believe that the DeLite works amazingly well together with the TV 2x Barlow. The image quality simply doesn't suffer at all when used together. This is also the same result I got with the Delos. It also worked very well together with this Barlow.
During my brief observation session with the Delos I enjoyed it very much. I believe the quality of the optics is the same as with the DeLite. The Delos is a bit more comfortable to look through because of the larger diameter glass, but this also makes it bulkier and heavier. This will restrict the application possibilities a bit (smaller/lighter telescopes, binoviewing). Given the much lower price point of the DeLite I still prefer it over the Delos.
I plan on doing an in-depth review of the Delos in the near future and I will compare it to the DeLite.
Unfortunately I haven't had the pleasure to test the Ethos line-up yet, but I also plan to change that in the future. I hope this helps.
I have an older TeleVue Barlow that is a 2.5x. When I say older, it is at least 20 years old. Do you know anything about them?
@Wayne Teachey Unfortunately I haven't had the opportunity to test them, but knowing Tele Vue I believe the optics are still top notch even if it's a 20 years old design.
Thank you for your reply!
👍👍
I don't see much point in using a Barlow as long as it just magnifies but doesn't reveal more details.
It.does reveal more details, provided it is decent quality, and the power you are going to does not exceed what the scope can do or the seeing conditions allow
Dang their powermate costs more than my entire scope.
I'm in pain - I just missed to buy it for $45 (as new in box) from a local guy. I knew he was selling it for $80, but I already bought lots of equipment recently, so I hesitated, and when he reduced the price, I just wasn't fast enough 😢
Is this 2 element barlow really better than 3 element GSO ?
@A0111. Oh, I feel your pain. I haven't tested the 3 element GSO Barlow so I can't comment on it's performance, but compared to the 4 element focal extender from Explore Scientific and Svbony, the Tele Vue is a bit better.
@@BogdanDamian thanks for the reply. The silver lining is that I already have 2x svbony barlow, and all my 3 main scopes have 2" focusers, so I probably need to go for 2" barlow anyway... but man.. $45 , ahhhh
Interesting...
Just got this Televue 2x barlow, and spent few hours comparing it with 2x SV137 (T-Thread version) looking at the Moon, Saturn, and Alpha Centauri through my 10" f5 dob....
I can't see any difference 🤔
@A0111. That is indeed interesting. I have the 2x sv137 here, but I didn't get to test it yet. Now I'm even more looking for comparing it to the Tele Vue. Keep an eye out for that video 🙂
In most cases 3 element barlows are trying to correct chromatic abberation with a 3rd lens, where an ED 2 element barlow also corrects abberations (or more precisely, does not introduce abberations). The televue barlows do use ED glass.
4 element barlows use the 2nd 2 elements to make the light parallel,.flattening the field which makes them ideal.for.imaging, an also.solving the eye relief issues that long focal length non negative grouped eyepieces have
How can I make these 1.5 x.? I require an 1.5 x Barlow but not these are not available.
You could try adding a reducer lens in front of the barlow, but it's going to be difficult to obtain exactly 1.5x. It would be much easier to just get a barlow from a different manufacturer. I believe Omegon and Baader offer 1.5x barlow lenses that have decent optics.
@@BogdanDamian Thank you for information 👍.
@@drkumarharaprasadmisra5562if you have a shorty barlow, most of those allow you to unthread the black lens cell, and thread it directly to your eyepieces and that gives 1.5x.
If not, just buy a $20 shorty
Does tele vue make a shorty 2x barlow for Dobs?
@CAMO7357 Hi! Unfortunately Tele Vue does not offer a shorty 2x Barlow lens. In theory you could just unscrew the black bottom part of the 2x Barlow lens and screw it directly into an eyepiece, but I haven't tested this yet and I don't know if it really works. The next time I'll be out with my telescope I will give it a try and then get back to you.
@@BogdanDamian Thanks man, That would be great!! 😁
No, and they work fine with dobs just as they are
@@BogdanDamianthe televue barlow is not threaded with filter threads to attach the lenses to the barrel, so it can not be threaded onto an eyepiece.
But even if it could , that would be the 1.3-1.5x trick, that shirty barlows can do, but that is not "like" a shorty barlow, as a shorty barlow is just designed with a shorter size,.which helps on some smaller scopes. But I think this guy thinks that only shorty barlows work on dobs, and no 1.5x trick was mentioned.
In fact, televue barlows work just fine on dobs, a shorty is not 'needed" for dobs
It's a BAR-low. Not a BARE-low.
It's also.series not seereeeiz , but give the guy's accent a break
100th view!