Hi all, I recently sold my QSI 540 camera and bought a new QSI 690! I replaced the 690 faceplate and filter wheel with that from my 540, thus I am keeping all of my original Astrodon filters, plus have the OAG port. So, my QSI is now a 690wsg. The camera is an upgrade from a 4MP to a 9MP chip, plus has smaller pixels on the CCD, a much better match for my scopes and after some tests, it is allowing higher resolution and a closer look (due to normally great seeing conditions where I live). Love the new camera.
This is one of the first light images from the camera - the Horsehead Nebula region (data collected on 12 and 15 Dec 2017):
Horsehead Nebula and surroundingsOriginal image and more details: http://jeffjastro.com/dso/IC434_12Dec17.htm