Camera's a 2600MC Pro, and I started getting a whole bunch of crud in my image path. Here's what it looks like on the 5" refractor:
At first I thought it was dew but it's in exactly the same position on different nights. It's not on my filters, because it's still there without any filter. It's not on the objective or the OTA because I swapped the camera over to an entirely different scope and it's still in the same place:
If I take flats with just the camera sitting there by itself, no scope, you can still see a blurry pattern of spots that look to be exactly the same debris except extremely defocused. And I cleaned the cover of the image sensor itself and didn't have any impact at all.
I've seen that a batch of 2600s had oil leaks, but in the examples I've seen that doesn't look like this, and try as I might I don't see any of this stuff on the sensor under direct examination. (Although it does look like the oil leak on the shutter of my Nikon D600 like a decade ago.)
I guess this is a pretty dumb question because I think I've eliminated everything else it could be and it's got to be debris behind the cover of the camera sensor itself, but am I missing anything else?
