Olympus E-PL6 Astro questions

Hi, I recently purchased an Olympus E-PL6 camera to use with my Nexstar 8 SE.

The reason I really like this camera is because it's very modular, I can strip it completely bare and basically just have a sensor and the rear LCD to attach to a telescope's 1.25" diagonal, when it becomes just about as light as an astronomical CCD camera, or just add the kit lens, which is small enough for digiscoping coupled to a 1.25" telescope eyepiece or I can add things like an EVF, or a flash, or use a remote or an external viewing screen. It's too bad more than one thing cannot be attached at the same time to the accessory port. Maybe in the future, Olympus will amend that. I see the camera has HDR so I would love to use it for some landscape photography too, especially low light landscape photography like Milky Way landscapes and doing sunrises and sunsets. That being said, I know the camera isn't weatherproof but is it okay to take to the beach and do sunrise/sunset photography from there?

I dont know if I can get the answer to this, but is it possible to use 1.25" telescope light pollution filters with this camera without getting much vignetting? I suppose I would need to thread the filter into the telescope-camera adapter somehow? Or attaching the camera body to a 1.25" diagonal without getting vignetting?

I looked up the clear apertures for my filters and it is 23mm. I hope this is enough to avoid vignetting since the diagonal of the sensor is less than 23mm. My Orion correct image 1.25" diagonal has a clear aperture of 27mm. Looks like most 1.25" filters have a clear aperture between 23mm-27mm. Filter thread pitch is 0.6mm and filter thread width is 28.4mm

http://www.amazon.co...l/dp/B0056HFFV6

I found a "sort" of answer here:

http://stargazerslou...h-31mm-filters/

The KAF-8300 measures 13.7x18.1mm, so the diagonal is 22.7mm. D31mm filter clear aperture is 28mm. The difference is 5.3mm.

Internal filter wheel places filters 21mm above the CCD, so the limiting f/ratio without vignetting is 21/5.3=3.96.

Filters in the external filter wheel is 25mm from the CCD, so the limiting f/ratio without vignetting is 25/5.3=4.7.

The KAF-8300 is a CCD camera that has a four thirds size sensor so the same measurements apply. My telescope has an f/6.3 focal length with a focal reducer and f/10 without. Adjusting these numbers for a 22.5mm diagonal and 23mm clear aperture filters means the distance from the filter to the camera sensor needs to be x, where x/0.5=10 when the scope is f/10 (x=5mm) or x/0.5=6.3 when the scope is f/6.3 (x=3.15mm). I'm not sure there's any way to avoid vignetting if this is the case- but what is the minimum distance the filter can be from the E-PL6 sensor? If we use the 27mm figure then it's a bit easier to do (x/4.5=10 and x=45mm at f/10 or x/4.5=6.3 and x=28.35mm).

These numbers might need to be adjusted in a positive direction since the Four Thirds sensor is smaller than I thought (in terms of imaging area):

https://en.wikipedia...r_Thirds_system

The sensor measures 18 mm × 13.5 mm (22.5 mm diagonal), with an imaging area of 17.3 mm × 13.0 mm (21.6 mm diagonal)

I think whatever distance the filters need to be has to be subtracted from this:

https://en.wikipedia..._focal_distance

For MFT it is 19.25mm

Another question I have arises from two adapters needed to connect this camera to the telescope-  two Celestron parts I am considering purchasing, which are 93633-A and 93625, one or both of which can be used with a 1.25" diagonal to connect to the telescope. I want to know where the filter fits into this, the imaging train should be camera+MFT adapter+93633-A or 93625+1.25" diagonal+telescope. I want to use the diagonal to image near the zenith and also because it's a correct image diagonal (the Orion one has a clear aperture of 27mm.) Are either of the Celestron parts I mentioned threaded for 1.25" filters or can I somehow screw the filter into the diagonal or eyepiece holder? Which of these Celestron parts can be used with my diagonal? Thanks!