Several years ago
I purchased a C90 and other than a few tests with my Meade DSI
imager, this telescope sat unused for several years. I disliked the
small 0.965 inch. eyepieces so much that I never fully utilized
this telescope. In 2018 I purchased a Baader 2 inch NX4 (C90)/ETX
Expanding Ring and a Baader Universal Photo-T Adapter C90 for NX4/ETX.
These adapters converted the C90 visual back thread (1.38 x 24 TPI)
into a 2 inch. SCT male thread, and allowed use of a standard
T-ring and 1.25 inch. eyepieces (via installation of my C8 visual
back). Below are several photos of the C90 with the Baader Expanding
Ring and Baader Universal Photo-T Adapter, a
standard T-ring, and a Canon DSLR camera. With
both Baader adapters installed, The C90 comes to focus (both with and
without a f/6.3 reducer
corrector in the optical path).
put together a case to store
all of my imaging equipment in one place. This makes it easier and
faster to start an imaging session; all I need to do is make a single
trip out to the observatory with
my laptop computer and imaging equipment case. The equipment
(below photo) contains the following: cables, the
eyepieces I use most,
barlow lens, the AVX hand
controller, EOS T-ring, 2 inch. SCT male thread
T-adaptor, 1.25 inch. T-adaptor, Baader 2
inch. NX4 (C90)/ETX Expanding Ring, Baader Universal Photo
T-adapter C90 for NX4/ETX, Telrad, GPUSB
I guide camera, f/6.3 reducer
corrector, and Canon EOS 1100D.
constructed a flat field light
box (below photos) to acquire flat field images.