(If this is not the right forum, please direct me to the correct one)
Currently buying equipment and researching my brains out in preparation for spring when it will be warm enough to spend hours outside making mistakes
I have a Nikon D750 (not modified nor do I plan to do so as I primarily use it for terrestrial work [I assume Nikon put an IR filter in there on purpose so I'd rather not remove it...]) and I have a ZWO ASI294MC Pro (color) camera being shipped as I type. Note that I'll probably start with the DSLR as it will be a bit easier to learn on (T mount also on order).
As I research, I'm reading about flats, lights, darks, bias's etc... my head is spinning. I find posts that talk about pieces of the process but I can't get my head wrapped around the entire process, begging to end as it were. Can someone point me to a post or any good website that explains the complete process? I'd kinda like to have the whole picture (so to speak) before I start diving in (the engineer in me).
The gist of calibration is expressed in this simple equation from ASTAP:
DSO signal =
I'll rewrite it like this:
DSO signal = (image-dark)/(flat - flatdark).
So take a light image, then correct it for the dark signal by subtracting the dark. Correct that for optics imperfections by dividing by the dark-corrected flat.
So, here's what you need to do, once you figure out exactly how to collect those darks, flats, and flatdarks, as described in the previous point.
1) At home, prior to imaging the sky, create a set of darks.
2) Collect lights.
3) After collecting lights, get a flat panel, put it on top of the telescope and collect flats.
4) Then cover the telescope and collect flatdarks.
5) Load all 4 of the data sets into DSS and let it do its magic.
P.S. I've never used a DSLR but I cannot even begin to imagine how using a DSLR could possibly be easier than using a dedicated astro camera.
Your 294 should come with all of the adapters and cables necessary. Then you just connect it to the telescope, plug in a usb cable into a laptop and start recording with Sharpcap or NINA or some other software.
Edited by acrh2, 15 January 2022 - 02:11 AM.