Put it on an orange tube Celestron 8SE scope. Works very well, stars are sharp to the edges with a Sony IMX571 aps-c sensor.

This lens cap fits perfectly on my orange 1970's Celestron C8 SCT telescope.

I have less than half a night's worth of data, but so far, I am very impressed with the performance of the ASI2600MM Duo and Antlia filters.

This is replacing my ASI1600M Pro and Optolong filters. I chose Alnitak as my test target, to give the new camera (and filter set) a trial by fire. I only got about 18 minutes per channel of RGB dat

a, due to a focusing error after meridian flip, but I got enough to see how the 2600 sensor performs against the 1600. There are no "microlensing" artifacts whatsoever. Additionally, the Antlia filters showed no halo around Alnitak.

The color of the stars is also much better than the 1600, taking into account the relatively short integration time on target.

As I was also shooting narrowband with 3nm filters, I used an OAG rather than the Duo's guide camera. However, the Duo camera showed up as a choice in PHD2, no problems.

My one half-night with this camera has made me look forward to the next stretch of good weather. I believe that this is going to produce excellent images.

RGB subs = 180 seconds @ 0 gain, 18 subs per channel
SHO subs = 600 seconds @ 100 gain, 10 subs per channel

It works exactly as described and helps with focus so much easier than manually focus.

Sharp image and good value

This filter fits my Canon M50 like a glove. It includes a small plastic tool that makes it easier to remove the filter when you want to use your camera for regular photography. The tool can also be helpful when seating the filter in place. This filter is made in Germany and works noticeably better than a cheaper clone UHC filter I have. The filter

I have has a "T max" of 93.2%. Not sure how to interpret that number, but a plot of the wavelength verses percent transmission would have been more informative. Overall a good filter and I like having the filter located close to the camera imaging sensor, thus avoiding any intervening optical components.