ASI 585 MC-Air and filters

janx

Hello everyone,
I’ve just purchased an ASI 585 MC-AIR to go along with my trusty ASI 183 MC-PRO.
I use the 183 on a Celestron RASA 8, with the Starizona filter slider, and everything works perfectly.
With the ASI 183 MC-Pro I can achieve perfect backfocus thanks to its 6.5mm.
The ASI 585 AIR, however, has a backfocus of 17.5mm, which makes it impossible to use the Starizona filter slider (which also has 17.5mm).
Do you think there are any possibilities of using alternative filter sliders, or do I have to resign myself to using traditional, inconvenient filter holders?

Thanks for your attention.
Giancarlo

Tech@ZWO

Are you referring to installing a filter wheel on the ASI 585 MC?Could you upload Starizona filter photo

janx

Hello, and thanks for your reply.
I use this Starizona filter slider on the Celestron RASA 8 with the ASI 183:

The Celestron RASA has a backfocus of 25mm.
The ASI 183 has a backfocus of 6.5mm, and the Starizona filter has a thickness of 18.5mm, which allows me to reach the optimal backfocus, with the advantage of being able to use a filter drawer.
I cannot use a filter wheel on the RASA because of the front obstruction.

The ASI 585AIR has a backfocus of 17.5mm, which makes it impossible to use the filter drawer, so I would have to fall back on a “fixed” filter system like this one:

This basically makes it impossible to switch filters quickly during imaging sessions.

I was wondering if there’s any alternative I’m not aware of.
Thanks!

Giancarlo