Laurin Dave

Hi Steve... came across this recent thread on Cloudy Nights.. uneven illumination of the OPs flats panel causing a very similar embossed dust bunny to those you had... Dave https://www.cloudynights.com/topic/661557-flats-not-correcting/

Wow Gav, that is absolutely brilliant... well done! ...more like a Cosmic Masterpiece! Dave

Looks good and looking forward to seeing more of your French adventure. Dave

Maybe try swapping out the usb cables.. bad cables have been known to cause this issue.

Hi Tom.. try going into PHD connect tab click on camera and it’ll show a list of cameras, does it just show ZWO ASI Camera? If so then maybe you need to have the AScom drivers installed for ZWO so that you have a choice of two.. that’s what I have and it works for me. Same in SGPro Dave

Hi Steve... did you figure out what was causing the embossing? Dave

That’s great news Tom.. Dave

It will be.. its only slightly larger (at 14mm by 10mm) than the 694/814/834 chips (12mm by 10mm) and smaller than the ASI1600 (17.7mm by13.4mm) which works with 1.25" so long as they're close enough Dave

Hi Steve... very strange, somethings moving, I'd work out how close to the sensor they are using CCD Ware dust donut calculator (my rough guess is 7mm which puts them on the sensor protective glass so maybe that's come loose) Dave

Are you using the ZWO filter wheel? If so vignetteing with either 1.25 or 31mm easily correctable with flats.. I've used both and saw very little difference.. 31mm just slightly better Dave

Fabulous image, how good is he going to be when he grows up ! Dave

Turn the gain down .. it’s in the camera control tab

Its 6.5mm

With ASI1600 to get 55mm backfocus its flattener then 11mm and 16.5mm spacers FW then camera ie take the 11mm spacer off the front of the camera and connect camera direct to FW. There are diagrams on their website showing how its done. At the moment you have 65mm. Dave

Canon lenses have 44mm backfocus and the distance from the front face of the camera to the sensor is 6.5mm so the camera adapter plus spacer should total 44-6.5mm i.e. 37.5mm to obtain focus. Have you measured it? Looks like the zwo diagram for the 183 is incorrect in that you do need to use the 11mm female to female spacer as it shows in the diagram for the 1600. For what it worth I have the 1600mono and filter wheel and the appropriate version for Nikon lenses and it focuses fine. Dave

Surely Darkframe should have sorted that out as part of their Stellardrive mod. I'd get in contact with them and ask them to fix it. Dave

Thanks Steve for your excellent write up, I shall add it to my copy of your Dark Art or Magic Bullet book which arrived yesterday .. I did notice that in this post Deconvolution now starts on page 51 rather than 45 as in the book.. What other gems are you working on? Dave