Heya everyone - I've been fortunate enough own the ASI6200MM for a few months now and have been slowly completing and tuning my image train. I've noticed a few issues with teh ZWO solution and I am wondering if;
a). I'm the only one?
b). whether QHY users have had it just as bad?
c). is this just "the way it is" in general?
I started by adding ZWO's EFW 7x2"50mm filter wheel (which bolts onto the chassis of the camera) and the new ZWO OAG (which surprisingly comes with an M48 aperture, so quick trip to the astro store for the M54 port.
First light and I quickly realised that the ZWO 2" mounted filters have some crazy reflection artefacts and also discovered that the M54 OAG light path (through eh stalk to teh OAG camera) was too narrow to be truly useful.
Off to purchase some Antlia 50mm unmounted filters and the ZWO introduced OAG-L shortly afterwards - giving me the opportunity to spend money twice - love this hobby! (note: the new OAG only comes with the M54 plate, I had by that time decided to go with an M68 image train to avoid creating shadows with the larger OAG prism, so yup - more money.)
Finally, a working image train - or IS it?
I had been trying to diagnose a calibration problem with my OIII filters (flats/vignetting) when it occurred to me that perhaps I was dealign with a light leak - so set about testing by covering up the "light sucking" end of the OTA and a series of long darks frames when I noticed that there was indeed not one but at least three light leaks;
1). around the edge of the tilter (the M68 version has no protective foam unlike the M54 and M48 versions - this has been published elsewhere) - so I taped that up
2). around the upper back of the filter/camera body interface
I was getting ready to pack up when I swapped filters from the Ha I had been testing on (it was the last filter I'd used) to Lum (in preparation for testing OIII, not sure why I just did) and I saw a sudden jump in my ADU counts - there was another light leak, which brings me to;
3). near or around the stalk of the OAG assembly - by this stage I had decided I was going to smother the thing in black tape so I can't yet be specific enough
Which brings me to my question - what the heck are these guys doing?! :-)
It's not like I am taking a domestic camera and using it for AP, I would expect light leaks, Im using it outside of it's design parameters - but this is an AP image train manufactured by the one company (so no blaming "the other guy" for messing up).
Don't get me wrong, I really love the camera, the data it produces, etc - but this is bordering on being unfit for purpose - it's hardly surprising so many beginners find the hobby hard, when they spend their hard earned on an integrated solution that basically won't enable them to get the results they need without some considerable troubleshooting skills (again to be clear, the tinkering is half the fun for me, but I can imagine a lot of people thinking it's them and not their equipment and giving up the hobby not realising they were probably on the right path, but they were let down).
I've recently been looking at the Moravian version of their IMX455 camera wondering if they've managed to narrow down the source of light to just the open end of the OTA :-)
p.s. my OIII "vignetting" problem persists, about to try out some new 3D printed masks from local supplier Testar who've been super helpful in trying to work this out