Fine tuning spacing

[Lognic04]

Hi all! :hi:
I am using a new corrector (and reducer) with my MT-160, and i should be at the 56mm of required spacing but i'm off (see attached pics of coma).
How can i tell if my spacing is too far in or out, and how can i fine tune spacing by only a few mm's? :question:
:help:
:thanx: :thumbsup:

[peter_4059]

I use these in between the t thread attachments.

http://www.astroshop.eu/extension-tubes/ts-optics-extension-tube-fine-tuning-ring-for-t2-thread-thickness-0-5-mm/p,48168

[glend]

You can get variable spacer rings, which adjust through a range and have a locking ring. Bintel has them i think, as do other places like Teleskop-Express, Agena Astro, etc.


https://www.teleskop-express.de/shop/product_info.php/info/p2641_TS-Optics-Optics---variable-T2-extension-20-5mm-to-30mm.html

[Lognic04]

But also, could the optics be pinched? the triangular shape from my research seems to be pinched optics. :question:

[billdan]

Hi Logan,

I had these pictures saved to my hard drive, can't remember who drew them so my apologies to the author.