Istar Optical made new lens Apochromat triplet 140 f6.5 (will be deliver together with Apex 5-elements reducer/flattener - effective ratio f4.2). I received from my friend first picture from this lens and notes:
I was able to get an image of M31 with the 140 triplet last night. The stars at the top are not perfect because of tilt in my questionable wooden OTA, so if you share the image with any potential customers, make sure they know that. But the scope optics look great and the image is otherwise pretty nice! I think if we can get a real OTA, we could get some very good images, but this is probably the best we can do with this test setup. I probably wouldn't post this image on the website because the stars don't look perfect. If we get a real OTA we can get some better images to post.
The image was with the ZWO ASI2600 color camera and an Optolong L-Pro light pollution filter. Exposures were only 60 seconds long and I took 60 of them, so this is just one hour of total time. The scope becomes f/4.2 with the Apex reducer in place.
Istar is planning on introducing a completely CNC machined OTAs with tube rings and 2.5” large format MoonLite focuses with dual accessory bracket. A complete package for estimated $4495.
Edited by Psion, 19 October 2020 - 12:08 AM.