Re: [ap-ug] M33 with 92mm Stowaway, combining RGB, H-alpha, and O-III
Well this is good information. The CFF92 was the other scope I thought of for being in the game for a well corrected field. Sounds like it's not terrible with the reducer, but could be improved on.
What about the flattener? Can it cover the IMX455.
Either way, sounds like more positive data for the AP92 upgrade option for the full frame capability and the TCC.
From: email@example.com <firstname.lastname@example.org> on behalf of Dale Ghent <daleg@...>
Sent: Monday, December 13, 2021 6:13 AM
To: email@example.com <firstname.lastname@example.org>
Cc: email@example.com <firstname.lastname@example.org>
Subject: Re: [ap-gto] [ap-ug] M33 with 92mm Stowaway, combining RGB, H-alpha, and O-III
It’s something I would be interested in, and I don’t even have a Stowaway. I have a CFF 92 f/6 refractor and the M63 APM-Riccardi reducer that have been using on it is baaaaarely passable, with some leniency, when using it with my APS-C sensor. I’m using an OAG with this scope since it’s a compact travel imager, so its pick-off mirror is definitely sitting outside the corrected area in order to avoid intruding into the sensor’s fov. A larger corrected field is certainty something that I miss and would jump at the opportunity to have, even if it meant a focuser upgrade (my CFF 92 came with a 3” FTF; an improved optical design similar to the M63 format or a little larger, would be fine in my case.)
The APS-C Sony IMX571 sensor that is now in many CMOS astrocams is a fantastic sensor and is fairly accessible in terms of price, which is fueling its rise as a common sensor to see now. It’s the smaller cousin of the full-frame IMX455 which is also popular, of course. A TCC and flattener that could competently handle both would be noticed. Other makes of (mainly Chinese) refractors in the 90-110mm range also lack a competent reducer/flattener for these sensor sizes and one could find use with those.
On Dec 11, 2021, at 19:33, Roland Christen via groups.io <chris1011@...> wrote: