RASA8 - One imaging scope to rule them all?

[andrew s]

4 minutes ago, vlaiv said:

I'm with you on that - if it were not for working resolution. It is ~2"/px and such differences should be visible in higher working resolutions but not so much on 2"/px. In wide field images FWHM per channel is roughly the same with very little difference.

 Ok so why do the stars have blue halos? Regards Andrew 

[vlaiv]

2 minutes ago, andrew s said:

 Ok so why do the stars have blue halos? Regards Andrew 

Check out spot diagram at ~400nm vs one at 550nm or 600nm (yes, it blows up again at 700nm, but hot blue stars have much stronger emission at shorter wavelengths).

[ollypenrice]

8 hours ago, vlaiv said:

Well, you can't get around physics, and it says that whatever affects stars, affects the whole image.

 

We are not just talking about optical physics in discussing an imaging rig, we are also discussing the interaction between the optics and the camera and the data with the processing software and, as Andrew said, the role of other variables like the atmosphere.

I don't assert that what I observe derives from the optics. I don't know where it comes from - it is just what I observe...

Olly

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[wimvb]

12 hours ago, ollypenrice said:

The MN190 deserves a makeover with quality hardware around the optics. 1000mm FL and F5 is right on the money for galaxies and nebulae.

😁

It just happens that a year ago, I decided to upgrade the stock focuser with its wobbly extension tube and ordered a FeatherTouch, with adapter ring. This is supposed to be a drop in replacement. Unfortunately, the FeatherToch turned out to be vapourware. So this summer I've installed an Omegon focuser, which was a drop in replacement (except for a thin shim, because it was slightly too low).

But I digress. Back to the original discussion...

[wimvb]

Double post

Edited August 27, 2023 by wimvb