Telescope 30x zoom with DIY Barlow lens
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- เผยแพร่เมื่อ 17 ธ.ค. 2015
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#Moon #Telesope #Barlow
My passion with astronomy made me post this DIY work for Primitive Barlow lens for the magnification of refractor telescope with PVC pipes.... I got a zoom of nearly 30x with this in my DIY telescope. I watched the craters of the moon with this... and Orion Nebula also looks like a hazy cluster of clouds with this.... Enjoy..! The cost of all the lenses 2 convex, one concave 5cm focal length and the front lens say 100mm dia 75cm focal including PVC pipes 4" dia, and 2" dia with 2 unions sockets and a bit of pipes comes under Nrs. 1000 rupees or USD 10 only. Try to get the pipes from KABADI's as far as practicable and wash and rinse them properly before use.
Thanks for the video and good explanation. This is the first video I found on making a Barlow. Your explanation was easy to understand and was very helpful to me.
It was really useful thankyou
Thanks
This dude saved me from buying macro lens
so good
sir can u tell me the lens details of the bigger one show last..??? also can we watch planets with this..??? can we get clear view of the moon and the planets
Can you make one for pinhole spycam to zoom objects 40meters away? No need wide angle
hello can you guide me regarding where can I find the lenses online?
thanks
can I find these lens from online
Nice
Thanks from India
Check this one th-cam.com/video/r-9AOC7XJtI/w-d-xo.html
lens numbers is on eye pice an convex lence
do you have some images with that DIY scope , would be nice to see
Shall try to click one and send it you soon....I might need a stand for that....might need a lot of effort...Cheers...!!
how you made lenses
I have a 100mm objective lens, FL is 500mm. One 50dia concave lens FL 20cm, two convex lens 50dia fl 20cm. Can u plz do the calculation accordingly?
Where did you get your lenses from? Im trying to make a camera lens for a homemade 8x10 camera. Thanks!
Try online !
Can i get to buy 60 cm focal length radius of 6 ' inch. Can you give me lens price. I want to buy in center of Kathmandu.
what setup would be required to get 90x zoom along with clarity using Barlow configuration?
Kindly suggest the lense requirements for the same....
and this is the best DiY telescope video I came across on TH-cam.... Thanks for this, I am a space enthusiast and it was really helpful😇
It was so good to know your appreciation on my video... The barlow thing happened by sheer luck....and the wonderful thing about this DIY telescope is....it is good to enough to peer into Orion... just need to build a sturdy stand... a must...! Being an architect I am little poor in mathematics....try getting 2 convex of 25mm and one concave of 15mm all of one 1" dia... the barlow focal would be less than 10mm then... and get an objective of 100cm 4" dia... and your magnification should be +100 then... Cheers...! Ashutosh...!
DIY Debesh thankyou soo much for replying... I'll be very thankful to you on successful completion of my telescope....
I hope the above configuration won't mess with sharpness....Any views on this?
It should not... if at all it does... try reducing the aperture of both Objective and barlow
...by paper cover... or you can get achromatic objective lens... quite expensive though...! 3in barlow and objective would not mess... unless you try more combinations.... make sure to do a stand as your magnification is very large... a slight movement will shake the whole world through your telescope.... Cheers...!
Form nepal and this video was shot around about the Earthquake
The earthquake was caused when he dropped the lens at 5:35.
Can I use only Barlow without eyepiece
Very nice
Pls. Check this one th-cam.com/video/r-9AOC7XJtI/w-d-xo.html
please sir, can you tell me the focal lingth of the front lense and the concave lense
Around 80cm focal length and dia 4" convex lens.
Good 👍👍👍👍👍👌
hi ,is it necessary that all lenses for Barlow should have same focal length .
amit Singh Not necessary...try different combinations...!!
I need some help
Hi Debesh,
As per our previous conversation, I found some lense from online shopping.
Objective lens- dia 100, FL-600mm/60cm.
For eye piece-
concave lens- dia 50mm. FL-15cm, 20cm, 25cm, 30cm, 50cm.
Convex lens dia 50. FL-20cm, 25cm, 30cm, 50cm, 75cm, 100cm.
After doing a lot of r & d, I can't get the straight image. The images are same as before, up side down.
Please suggest how can I get the straight image, as I see in my eye. So that I can successfully make the DIY project.
Regards,
Uday.
Use 50mm dia , FL-100 cm convex for front lens, try getting 100mm dia and for eye piece use 25mm dia 2 convex lens and one concave 2.5cm focal length. You may get those lens on one online shopping as well. The image would be still upside, to get erect image you shall have to insert one convex lens same dia in front of eye piece combination.... with trail and error.
It seems the with the lens that you have now for eye piece, would make the telescope very long..... Sorry for inconvenience.....! Keep trying...!
Hi uday can you share the link where you bought lens online
Use 2 prisems in-between
where did you bought ,where can I buy and dimensions of them.
Give me an answer please
I bought these in Kathmandu, Nepal.
Does regular magnifying glass lens will work? I also have a small convex lens but the other side of it is flat and I also have a plano concave lens that I got from an old film camera eyepiece.
Now try finding one eye peice of a focus lens of old photocopier as well, but your convex, plano convex should have sufficient focal length at leasr 30cm, or else hunt for it. You can try with these combination.
How about if I use two magnifying glass lens? but I didn't know what is the focal length of each one.
@@alfred4264 Try ways to find focal length from other TH-cam video's...otherwise hold the glass in one hand and try focusing light from a distance usually through window of your house to a paper, and measure the distance from the lens, that is the focal length....!
@@debeshbhattarai Okay, thanks for the help.
excuse me sir, does your barlow lens composed of one concave and one convex lens or one concave and your eyepiece is composed of two convex lenses ?
and what is the focal lens of the concave lens ? what is the relation between the barlow lens's focal lens and the eyepiece's focal lens ?
@Safy....The entire assembly is a barlow...and it is eye peace only....See the illustration from 2.24 minutes... Hope it clarifies your query .... Cheers...!
DIY Debesh yes sir i got that
Thank you 💗
yeah,can u see the Mars too
good
Does those lenses have power sir
& I want 23mm focal length eye piece
How can I make it
Can you suggest me
Please take 2 no 40 or 50 mm convex and same focal length concave, all of say 25mm dia lenses. Arrange them as I describe them in video. It should work. Try buying these in Science lab. I wonder if they sell smaler Dia lenses. GOOD LUCK.
Agadi laijau ta. Nepal😍
sir . what should be the focal length of he eyepiece lens for 1000 mm objective lens to make telescope???
Try making a DIY Barlow lens....take 2 concave lens of 25 to 50mm focal length and one concave of same focal length. Try getting smaller say 25mm or 1" dai if possible. Smaller dai is best option. Rest you follow the video....might need smaller adjustment as required.
Projection lens use ?
center or kathmandu! :D agadi laijau. upayogi video. ktm ma kata kinna paincha yesto lens?
Shirish Maharjan you can get these lenses at Thapathali...opposite Business Square.
thanks! will make one.
Thanks for the video sir
but mere paas time kam h and chashme ki dukan se jaldi lenses mil jaayenge
so can you pls tell what sholud be the power
+ve or -ve????
+Sandeep Kumar Try bying these lens in science lab...but not in Chasme ki dukan....they will confuse you even more.
sir everyone is saying 100mm dia bohot zyada hai
can you pls give me other measurement for same magnification
Do you know where to buy those convex and concave lens in Kathmandu?
Opposite Business Park Thapathali..at International Lab...science shop.
Se ve muy buen contenido. Pero si fuese en español sería fantástico.
how much to CONCAVE optical x value
Telescope 30x zoom with DIY Barlow lens -
dherai ramro lagyo sir. now I watching from Qatar.very good learning sir.🇳🇵🙋♂️👍️
Nice...Share it in your social media.
Kun deshama hunuhuxa sir ahile.
Sir Will u please mention the list of lenses you used with details..
In the tele. 2 convex 50mm dia, and one concave 50m dia....all focal length around 5cm. The objective lens 100m dia ...800mm focal length.
Can I watch saturn with this???
It needs a stand for proper viewing....and try using achromatic lens objective lens if possible to avoid refraction. The barlow combination works fine.
can you use lenses out of projection tv's?
Pls. check the focal length...better if they are less than 5cm..! .The lower the focal length...the thicker the lens are...!
Is there any way i vould get detailed info from you?Want to get some amazing help from u regarding this telescope?
You can visit me to find more details if you are in Ktm.
Thanks for the video. Shouldn’t the inside be black?
If possible.
can you be more specific about the eye piece...?
does it contain any lens or just a ring?
plzz sir answer, it's urgent🙏🏼
It has lenses...please watch the video again.
You didn’t watch video !!!!!
@@hiden1980 I had written ' it's urgent' 2 years ago and now you're asking me this 😂
btw thanks for replying on my comment 😊
I need
*50cm focal length with 1.5inch circumference..
and
* 5 cm focal length with 1.25inch circumference.
if i use 3 inch front lens (F.L. 25 cm) and if i use the eyepiece lens of 10 cm focal length then what should be the length of pvc pipe ??????????????????????????????????
Ideally it should be 25+10=35cm, however it may differ by 1 or 2 cm, depending upon the distance you point. This combination would not give you much magnification. Magnification is always Front lens Focal length/ eye piece focal length. this is only 2.5 magnification in your case. Try using 100cm/ 4" lens for frontand use combination of 5cm F eye piece convex/ concave combination for eye piece to zoom into the craters of the moon.
i really appreciate your efforts however.... Cheers...! www.ifa.hawaii.edu/users/gruff/default/Astrolab/07BasicTelescopeOptics.htm
very useful and well explained, trying to make a monoscope by myself could you give me a hand? thanks in advance
this is informative video. Can you please tell me foldscope (paper microscope kata painxa hola ktm ma please help??
Have no idea...You can try combination of lenses to create one DIY microscope... Cheers..!
hora tyo lens shop ma katiko thagxa any idea??thapathali ma ??
ani tyo pasal ko nam chai
k hola
can you tell me some shops(without online shops) name of kolkata where i can get the actual lenses...
I am not sure ... I may need few days for that...!
I have 3 convex (+50, +100 & +150) and 1 concave (-50). What can that all combine for making barlow lens like you?
Or can I make that lens for objective too?
Hope someone tech me.
Not very clear, is it focal length or Dia. Also specify in mm. We can find focal length by simple experiment, watch the video till the end. Add set of 2 convex and one concave reduces a lot of errors of color. But make sure have small hole with a washer if your lens are more than 10 mm dia.
tell me quickly......................... i am so excited for making this.......... 12 march is a full moon night.I want to make it before 12 march. i am asking you because i can't get the actual lenses at Kolkata...........
sir can u tell me the formula for the net focal length of the barlow so that i can use lenses with different focal length for different magnification?
Barlow kept before the eye piece...it helps reduce the effective focal length...more lens combination may makes the image blurry though...start with this one ...shall update more en.m.wikipedia.org/wiki/Barlow_lens
ani sir tyo 4" convex lens chai hajur le bata ko shop ma painxa ki nai? masanga 60mm double convex lens xa tr tyo objective ko lagi sano xa.
Lab international at Thapathali ...give my references for discount.
sir after reading about barlow i think it can be made by only two lenses and is placed between eye piece and objective and the magnification is proportional to distance between eyepiece and barlow. So are u using the third lense as an eyepiece? also what will be the effect on magnification when i use a convex lens with less focal length i.e. 3cm in place of the third lens?
You can to by alotof lens of weak telescope and you can asembly this lens you obten very telescope very hight distance show
Can I use this Barlow lens in reflector telescope ?
best craft ideas Try using them...it will help magnify things....but make sure to fix it in the right....refer other videos on Reflector telescope.
OK
I used this Barlow lens in my homemade reflector telescope and its worked.
DIY Debesh can I find you in facebook???
No
Where we can buy that kind of lens?
Try them in online shops...or science lab for kids.
From where we can by this lenses??
Science labs !
What is the power diopter of lens
Diopter is 1000 divided by the focal length of the lens. So the objective is 1000 mm focal length makes it 1. And the eyepiece is 25mm focal length would be ..... 1000/ 25 works out to be 40.
No demo
whats the power of those 3 lenses of eye piece and objective lense??
Eye piece 2 nos convex lens 2 inch dia 5cm focal length plus one concave 2inch dia 5cm Fl
The objective lens 4inch dia 80 cm FL
How much will be cost for these lens
what is the length of the pvc pipe of the telescope and the eyepiece?????????
Alekhya roy around 70cm...shall put the details soon...actual measurement...in Delhi for few days.
Alekhya roy around 70cm...shall put the details soon...actual measurement...in Delhi for few days.
É mais legal
from where you buy that convex lens.
Try these lenses in School science shop...or from online vendors...Cheers...!
Hope you may find these on, try your luck m.indiamart.com/impcat/optical-achromatic-lens.html
Where can i get those lenses in Nepal ?
And telescopic mirror of about 8 inch.
Star International Lab, Thapathali...!!
Try online.
sir maine lance shop pe ye sari details de k "Concave convex lanc, focal length 70 cm, Dia 6.7"
to shopkeeper puchh rha h k lance ki power kya du, + ya -
kya du?
ab mai usko kya bolu plz reply Sir
Power nahi chaye he.... aap science lab wali dukan pe ja ke pucho...ow aap ko sahi samam de ga....! Kahin aap chasme ke dukan to nahi gayen....oh samajh na hi payega..... Cheers. Just hunt for a science lab ..they shall give you the right stuff..... Cheers...!
thank you sir, for reply
ha mai chasme ki shop pe hi gya tha, fir kis shop pe jau hmare yha to sirf chasme ki shop pe hi lance mil skte hai
Aap online shop pe dikho.... ho sakta hey...... Milega... Cheers..!
How to make eyepeice
Shall get back to you soon, but if you see the entire video, or other video in my playlist it is there.
hello sir can u please suggest me lenses for around 100x magnification to view saturn mars jupiter and venus effectively and what would the total cost be.
100x magnification is pretty large though. I would advise you to use smaller eye piece of of say 1cm focal length, for that you can use 2 convex and one concave lens to create a DIY barlow. Use 4" dia 100cm focal length objective lens
, preferably chromatic lens, which helps to correct the color dispersion. Please note the lens smaller than 1" dia is difficult to handle.
sir tyo Barlow eyepiece banauda
overall 1 cm focal length banauna each lens ko focal length kati chaincha?
loner dime All lenses should have max 2 cm focal length. you need 2 convex and one concave lens. which corrects chromatic abeeration and helps to give you sharp and closer view.
lens ko exact shop vandinu na
You can buy it opposite Business square Thapathali, Kathmandu. I wonder if you get smaller lenses there. But try with 2 convex and one concave 50mm dia, 5cm focal length for DIY barlow and one 4" dia around 100cm focal length for objective lens. These lenses are not very expensive though. This video deals with that.... La..!
Hello sir
I saw your video ,it's really good
I want to make triplet lens of focal length 200mm ,can you help me to make... What focal length lens I need and how I should assemble,so in result I should get 200mm focal length..
Thanks
The bigger focal length requires bigger assembly and stand. For the objective try using 100mm dai a bit easier for a accesories. You may try for 150mm too, not readily available though. Try ordering lenses online for chromatic doublet ...for 70mm, cost around 80 dollars in IndiaMart lens supplier. Try finding eyepiece of say ..suitable one starting from 4mm to 20mm.
And for stand try using my DIY stand. Shall post a video soon.
Ok thanks sir
what is the focal length of the objective ?
ARSLAN ASGHAR It is 100cm focal length and 4" dia objective length. With this DIY barlow the apparent objective focal length becomes almost 2x100 cm.
sir...can you give me the info about focal lenght of all lenses
Focal length front lens 4" dia around 70-100 cm, two convex 2" dia 5cm focal length, concave 2" dia - 5cm focal length
hi plz what is diameter of these lenses
EYEPIECE 50mm, 2 convex one concave and OBJECTIVE 100 mm...!!
Good hobby for a plumber ☺
So total of 3 lense in eyepiece were used and one lense was used in the main module?? Please reply debesh sir..
Front 100mm dia 100m focus objective.
@@debeshbhattarai So U used the frame of waterproofing tape and there was nothing inside it then?
Could not get...what you said regarding waterproof tape, please repeat.
YOU TOOK three lenses... A concave, and two convex and stacked them together. so that's our final eyepiece through which we are going to look or there is another lens after those stacked lenses for our eyes...?? INSIDE that yellow waterproofing tape frame....
@@sagarkhatiwada1913 only 3 , 2 convex and one concave...!
Hi🙏👍🔔🔔👌😎
Can I attach this Barlow lens to my monocular telescope of 10× magnification?..what total magnification will it hence give?..plz urgent
You can...but it is a bit tricky game. First make a small attachment to hold your barlow arrangement. Make sure to slide it to and fro....till you get the right focus.
@@debeshbhattarai thanks a lot.. atleast now I can try increasing the magnification from 10× to 30× maybe
sir can we see craters of moon with this telescope?
+Sandeep Kumar Yes you would.
thank you sir
Sir, I do not understand the last part
Need to transcribe it to English...as I am not native an English speaker.... Hope I find time soon.... Cheers...!
Ayúdame por favor
Solo cuéntame sobre el último video porque no lo entiendo
Sir yo lens haru butwal ma kaha painxa? Please reply!
+AMAN pathak Do not really know...!!
will lens from the opticians work?
Lenses lene kaha se h
You can buy it from School science Lab..try it in your area.
how can i make telescope using 3 diffrent magnifying lens??
Smaller ones shall work eye piece, the big one should be used for objective.
@@debeshbhattarai i have atleast 100mm of objective and about 30mm of eyepiece should it work for moon just for fun 🙂🙂
@@mehulgalchar6980 It should, 30 mm eye piece looks pretty decent. try getting 2 convex and one concave of 30mm eye piece... The sky looks amazing after that. You can still make a telescope with this assembly ... !! do post a video after that... make sure to make a stand ... after that.
@@debeshbhattarai but i have two magnifying lenses its okay to see upside down and can we use 3 ????
@@mehulgalchar6980 The world gets upside down in Astronomy...try using camera to correct it later. I would strongly urge you to create a stand. There is also a video of stand assembly in my channel...do watch it.
What is the name of this lens?Where to buy?
2 Convex and 1 Concave 50mm Dai 50mm ...and objective Convex lens 100mm dia 800mm focal.Try them in online science labs.
@@debeshbhattarai where to buy?
@@anentertainment9140 Try science lab for schools...!! Shall post you link if you can not find them. Please update...!! Online would be convenient cause of #Covid...Stay safe and Happy...!!
How it s 30x
This is ought to be math only I guess. I get as much as 15x with objective of 75cm and 5cm eye piece first. And the DIY barlow doubles it....!! Not only that the right combination of my of 2 convex and one concave gives a crisp and sharper images. Pls. Try it on your own too. Stay blessed and happy.
what will happen if the focal length is more in Barlow lens. 25cm instead of 5cm. plz suggest
The eye piece focal length has to be smaller. Try to have lenses of smaller for eye piece. The big one 25cm may be better used for Front Lens. If you happen to be in South Asia...these lenses are for less than 100 Rupees each...Cheers...!!
Can I see Neptune clearly through this . I have 700mm focal length telescope and 8mm eyepiece .
You should.
Means can I see.
th-cam.com/video/yVE8Qizjbbo/w-d-xo.html
Lance kahan milenge
Any Science lab for schools...ask for concave and convex lense with focal points as in the video and they are not expensive.. please note.
Bro kata ra kati parxa hola yesko ani size haru avialiabe xa ki xaina hola ...i need it for my project..m frm ktm
The Science shop opposite side Business park, Thapathali..!!
Thanks ani Kati Linxa price???
@@sammyvlogs7064 around 500 for all or less.
sir kitni dur tak dikhai ja sakta hai??
ये टेलिस्कोप् से आप्को orion nebula तक् आराम् से दिख्ता हे... a good DIY on Astronomy... Cheers..!
Dimensions pls
Most of the dimension are there with the drawings.... but for you focal length of convex and concave lens 5cm only. The combine focal length concave plus convex and convex again... the shortest focal length would be 2 to 2.5 cm. The attachment PVC union 50mm inner dia, and the pvc pipe 50mm some 20cm long. Hope this would do...!
This is a DIY... and this video is meant for the people to understand the basics of Barlow lens and build one if they have time.... Cheers..!
Thank again
Greetings from egypt
With a 30x zoom, you can see the rings of Saturn, can't you ?
Yes you can.... but if your front lens is bigger, then the viewing gets definitely better.
Debesh's Music DIY and Alternative Yoga EVnR Thank you. Could you tell me how much do you pay lents where you live ?
For front lens 100 mm dia , I must not have paid more than 5 USD few years back, I do not remember exactly. But these cheap lens have chromatic aberration problem, which you can decrease by reducing the aperture size by 40%..... by using paper cover around edges.... gives a sharper view also. Try to find 150 mm dia cheaper lens, you would be able to get 90 mm effective aperture after correction.
🙏🌿🌹🇮🇳 PSSPPP 🇮🇳 PALOJU JAI SRIRAM 🇮🇳🌹🌿🙏
what will be the requirements, if I want to watch up to 10 to 15 kms distance. Or watch the craters moon clearly.
Try having 4" dia dia 100cm focal length front lens, and make barlow as in the video with 2 convex and one concave of 2" dia or smaller the better with focal length 5cm or less always better...!
نريد شرح بالعربي
dai eso sample ko photo haru ni haldida hunthyo if possible
Shall try to put sample soon, but that itself becomes a big project, shall prepare a tripod stand first .... Thanks..!
th-cam.com/video/hS0X_A5wIOw/w-d-xo.html
It's not clear
+Sureshgouda patil You can follow my blog at Debesh Directs...!!
30 mm glass sale
Joder, vaya que no le entiendo
what the hell he just made some shit
The end results are important. Please show the actual images of planets or moon as seen through the constructed telescope, else the whole video showing the detailed construction is of no use.
I know...hope this lockdown may give me ample room to create an attachment for this. Many Thanks..Just thought of this brilliant idea of attachment...!!
@@debeshbhattarai Thanks for the consideration
Finally managed to do the stand today, many thanks ...shall send you pics of Moon's crateres soon, please watch this one...the amazing power of low cost innovation....! th-cam.com/video/rQaRPzDohYk/w-d-xo.html
th-cam.com/video/hS0X_A5wIOw/w-d-xo.html
Do you has email? I need your email.
You can ask me question here..too...!!