DIY Helical Focuser
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- Опубліковано 29 сер 2024
- This DIY helical focuser was made using a 1.25-inch overhead UPVC water tank connector or tank nipple. Please see how I made it. It is simple, inexpensive, and does not require joining or cutting. It is also low profile with a minimum rake-in height of 7 cm and a maximum of 9.5 cm approx. Good focusing range of 25-30 mm. I later made a few modifications. Please check the complete build detail here: astrokhan.word...
Please also check and subscribe to my telescope-making blog: astrokhan.word...
Dude that's clever! I believe this is working way more better than relatively cheap and manufactured rock and pinion focusers.
Yes, it's working way better than Cheaper rack and pinion. I made it more low profile later. Please check my blog astrokhan.wordpress.com and complete write up about this focuser astrokhan.wordpress.com/home-2/assembling/diy-focuser/
Amazing! I'm brazilian and, all astronomic equipments is very expensive, imported. So, do it yourself is extremely useful.
Thank you!😊
PEACE BE UPON YOU AND YOUR FAMILY! Sir, it’s a very good idea, very simple and easy, i am planning to build my own newtonian telescope, this video will definitely help many people, Thanks for uploading this video.
Thank you Abdul Jabbar
One thing I want to add is that every eyepiece has its own built in super fine helical focuser. Just loosen the top section from the barrel,and you got about 1/8 inch of travel before the two separate. Most eyepieces are threaded to allow this.
Muito bom parabéns pelo trabalho vou tentar fazer mesmo 🇧🇷
Thank you and all the best!
Amazing! So useful yet so simple and creative.
Thank you 😊
Extremely nice and clean design.I bet it works great.This gets me motivated to make one for my 6" Dobsonian.
Thank you! yes it works great.
@@astrokhan One question.Have you ever tried applying "damping grease" into the threads? To make it turn super smooth?
@@bd764 Not damping grease since it would attract dirt. Rather I have used Teflon tape on the threads to make it smooth turn. please check the bottom of this page on my blog astrokhan.wordpress.com/home-2/assembling/diy-focuser/
@@astrokhan Ahhhh. teflon tape. never thought of that. Excellent engineering and very low cost for sure.
@@bd764 Thank you!
Super Idea,,...
I appreciate your effort👏👏👏👏👏👏
@Aasif Kamaal, thank you! 🙏
Thanks for the video. I just finished a focuser that is a little similar to the way yours works.
Yours has some advantages over mine and I might modify my next one to be more like yours.
Thanks for watching. Just subscribed to your nice channel. I will learn more. Looks like what you used is called FTA & MTA in my country. They are actually good for small form factor design and short focusing distance. I had actually planned to use them initially but abandoned due to less focusing range available. But as I said they are good for compact design and short range focusing.
@@astrokhan Thank you for your kind words of encouragement and for subscribing.
Thanks also for sharing your experience and why you abandoned your use of the FTA & MTA.
I suspect that the way I make focusers near the camera end of the tube as push / pull / twist with about a 100 mm range of adjustment in addition to the threaded fitting that the threads can be used as a "fine" adjustment after getting close to focus with the push / pull / twist arrangement I showed.
I think the potential problematic issue with mine might be the slop in the threads when the threads are extended longer. If that's the case I'll likely adopt your type of threads as an addition to what I have now or as a complete replacement. I'm happy to have your method as an alternative to what I'm doing at the moment.
I'm also subscribing to your channel and I look forward to getting more of your ideas.
@@southernexposure123 thank you and all the best for future work and design.
Good work, thank
Thank you
@@astrokhan bro do you sell 6'' mirror?
Hi, I never seen before like this. A lot of thanks for your help to making a telescope. Can you share the price of the mirrors. I will build one. Again thanks.
Thank you. Please check more about this focuser on my blog astrokhan.wordpress.com/home-2/assembling/diy-focuser/
You can visit my blog and learn about mirror making too. However if want to purchase, you can buy GSO parabolic mirrors from Tejraj in India (Not sure which country you are in). An 8 inch mirror may cost you around 10k Indian rupees.
@@astrokhan Indian from TN thanks for reply.
@@skypi199 good to know. Thank you!
Hi is it possible to attach camera instead of eye pice
Yes you can. You need to use 1.25 inch adaptor and T Ring in case you have a DSLR camera. For any other camera, you need to use suitable adaptor.
Hi
Is it for telescope
Then is a wonderful creativity
Please tell me
Thanks
Thank you. Yes this is for telescope. A DIY alternative for costly and commercial focuser.
@@astrokhan Hi
Can I attached camera instead of eye pice
Please let me know
Thanks
@@kiritengineer7506 yes you can attach a camera instead of eyepiece. You need to however buy camera a adaptor and T ring (for DSLR) or other suitable camera adaptor
Sir
As you havade this for eye piece
I did it for camera
@kirit Engineer Good to know 👍
@@astrokhan
If you have something where I can send you the photo
Please let me know
Thanks
@@kiritengineer7506 please email them to asifkhan31416@gmail.com and I will have a look.
@@astrokhan
Ok sir
Very nice invention.
Hi. İ saw your blog too . İ am also making my 20cm newtonian telescope. some parts cant find easily and cheaply in my country too. This focuser is one of them. Can i use the dimention of this focuser in my telescope too. İ am making an 8inch 20cm mirror 120cm focal length telescope. (10mm and 20mm eye piece . )
One more question İ also dont know how many cm should i use for secondary mirror do you have a suggestion or any equation?
Hi Eralp. Nice to know you and all the best for your telescope project. Yes you can use the dimension of this focuser for your telescope too. For your scope, If tube diameter is 25 cm and focuser hight is 8.8 cm (or 3.5 inch) you need a secondary mirror bigger than 3.6 cm. I suggest you to take secondary between 4-5 cm size. I will be putting the simple equation to calculate it on my blog soon. Please keep checking.
Bitirdiniz mi siz teleskobu? Ayrıca yok artık aboneliklerimiz yani ilgi alanlarımız bile aynı.
Do you know what is a helical focuser ???????
You must be knowing better than all of us. Let me know?
Hi, can I make this mirror with available kit. Will it perfect. Reply me thanks.
Yes you can make. It will require time and patience but the learning will be rewarding.
Hi sir .. what’s the eyepiece model that u used here? And what’s the size of the tank connector ?
Hi Akhil. I use 1.25 inch or 32mm OD eyepiece model. Tank connector used here is size 1 inch uPVC which has ID of around 33 mm. Please check the size before buying.