A high quality telecentric 3X made by itself

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antonello
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A high quality telecentric 3X made by itself

Post by antonello » Thu Feb 08, 2018 12:29 pm

Do you need a very high quality 3.3X or 3X telecentric and do you have the ability to build it?
Here is my project for a telecentric suitable for a H-alpha Telescope f: 10 (I designed and built it for my 150/1500 mm h-alpha Istar).
There are two projects, one of a 3.3X (OSLO) and one of 3X (ZEMAX), both made with the 3 same catalog lenses (I have used Optosigma lenses, but Eksma lenses it is similar, but cheaper ).
In red there are distances between lens.

telecentrico_3.3X_SATTA.jpg
telecentrico_3.3X_SATTA.jpg (358.68 KiB) Viewed 181 times
telecentrico_3X_SATTA.jpg
telecentrico_3X_SATTA.jpg (970.31 KiB) Viewed 181 times

If someone wants to make a telecentric from 4X to 5X (with these same three lenses) for another telescope (f: 7.5 or f: 6) I can do the calculations.
I also send some pictures of what I have done.

1.jpg
1.jpg (456.62 KiB) Viewed 181 times
2.jpg
2.jpg (417.54 KiB) Viewed 181 times
3.jpg
3.jpg (70.97 KiB) Viewed 181 times

The projects are free for personal use.
Last edited by antonello on Thu Feb 08, 2018 2:52 pm, edited 1 time in total.

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marktownley
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Re: A high quality telecentric 3X made by itself

Post by marktownley » Thu Feb 08, 2018 2:17 pm

Interesting glassware! Thanks for this :)
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http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

christian viladrich
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Re: A high quality telecentric 3X made by itself

Post by christian viladrich » Fri Feb 09, 2018 7:15 pm

Well done. Thanks for sharing !
Christian Viladrich
Co-author of "Astronomie Planétaire"
http://www.astroplanetes.com/

antonello
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Re: A high quality telecentric 3X made by itself

Post by antonello » Mon Feb 12, 2018 6:57 am

Thank's.
I add only some useful information (they are written in the images, but if one does not know Oslo or Zemax can not interpret it): the first negative lens must be placed just before the telescope's focus. In a 150/1500 telescope this distance is 86 mm for 3X, 92 mm for 3.3X and 113 mm for 5X ...
These values are lower than the backfocus of commercial telescopes, so these telecentric can be used without "to cut" the telescope.

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