285 Glass

[Darth_Muppet]

EEEK!

Whilst tightening up my Artemis 285 to the filter wheel, I heard a ...."crack".......

Yup, I've sshattered the protective clear glass at the front of the camera, seems the Tru Tek filter wheel I have has a screw thread thats quite long in comparison to the Art 285.

Does anyone know where I may be able to obtain a simple clear circular replacement glass? I measured the broken one at 50mm diameter.

Any help please gratefully received....

[ollypenrice]

I'd just try a mail to Atik. They are a helpful bunch.

Olly

[Darth_Muppet]

Ta Olly, but they dont keep it... (

[Psychobilly]

50mm AR coated... not cheap though...

AR Coated Windows - Optical Stock Windows | UQG (Optics) Ltd

Billy...

[NickK]

The reason it's not cheap is, if it's like the 16ic, that it's Schott BK7. Which means as the temperature change there's minimal changes to the optical properties.

[Psychobilly]

They will do you anything you like at a price..I have used them for the last 10 years or more for custom "windows" and filters...

[FraserClarke]

Could look somewhere like Edmund Optics. 1/4lambda AR coated BK7 windows are about £50 I think. You could arguably get away with something much poorer than 1/4 as you're so close to the focal plane, but TBC. You'll probably need to match the thickness as well as the diameter.

Optical Windows and Diffusers - Edmund Optics

[Darth_Muppet]

Thanks guys - an expensive overtightening exercise here. Thing is, unless you get it tight, the filter wheel can possibly swing loose on the thread as the scope moves.

[NickK]

Sounds like you need some threaded rings. When threaded, it limits the depth as the camera contacts the ring before the thread impacts the window. Tightening would then apply pressure to the ring and not the window.

[Rossco72]

I'm going through the pain and trials of connecting an Atik camera to a Tru-Tek wheel just now. It is made all the more difficult by needing a massive throughput for the KAI 11002....