Quick post on my experience last night testing these filters out on the ZWO EFW-Mini. With my Tak and its associated 130-R reducer I confirmed the level of focus I would need to exert between filter changes, and via testing with a Bahtinov Mask, I confirmed that the filters had the same focus throughout and focusing (at least for my needs) would not be required. I am sure that a electronically assisted focuser solution may find some slight amount of focus changes needed, but to my eye (20/20 vision) and my mask, they were spot on.
Now comes the slightly unfortunate part. When testing for vignetting, I did find that there is an ever-so-slight amount of it in the very corners of images. You can see what I mean here:
Sorry for not using the "Forum" format for the image, the Astrobin site seems to not be generating those tags properly on the machine I am using at the moment. The image is a 20 sec L sub, Bin 2x2, Unity Gain preset.
On the topic of this filter vignetting, anyone have some tips for how I may be able to eliminate this? My filter wheel has a 5th and open position, and I have confirmed that no vignetting is present when I image using that blank position, so its got to be something with the filters.
Here is how I have the camera connected:
SCOPE > REDUCER > TRING > Filter Wheel > 1mm T2-to-T2 adapter > ASI 1600
Any tips, tricks, or suggestions would be appreciated.
Edited by rockstarbill, 19 August 2016 - 04:21 PM.