Stuart,

 

I should have been clearer. The reflections in The Cone Nebula images was with the flattener in place.  These are different then what I’ve been talking about and likely to cause some confusion. These were definitely from the lens and filters reflecting light. Flipping the filters made no difference at all. These are completely different than the reflections in the images I posted. I’m up loading some images of the interior/exterior of the ota and imaging train as it exists now. See http://www.astral-imaging.com/reflection.html

 

Steve

 

From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, February 03, 2016 12:29 PM

To: ap-gto@...
Subject: Re: [ap-gto] Re: Reflections in Images

 

 

So, Steve and Joel, does it makes sense that they're caused by scatter off of something in the light path between the flattener and the chip and the flattener is directing the scattered light back down the tube?

 

Stuart

 

On Wed, Feb 3, 2016 at 12:21 PM, 'Steven Reilly' sreilly24590@... [ap-gto] <ap-gto@...> wrote:

 

Yes, these reflections are only seen with the flattener on.  I Image Linked the images in TheSky X and found none just out of the FOVi but that doesn’t mean it’s not coming from further away.

 

Steve

 

 

From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, February 03, 2016 10:35 AM
To: ap-gto@...
Subject: Re: [ap-gto] Re: Reflections in Images

 

 

Steven,

Your cone nebula image is revealing.  Those little "ring nebula-like" donuts are internal glass reflections.  If you move the scope around a little bit those little donuts will change position relative to the star.  I've seen this as well.  Unfortunately I think these are two separate issues.  The little donuts could be caused by a flattener or reducer.  Was your flattener/reducer in place for the cone nebula shots?

 

I'm still fairly convinced that the very bright arcs are caused by a bright object just off of the FOV.  But, I also don't use an RC scope so it could be different from my experience

joel

 

On Wed, Feb 3, 2016 at 9:28 AM, 'Steven Reilly' sreilly24590@... [ap-gto] <ap-gto@...> wrote:

 

Joel,

 

Have to run the dog to the groomer but when I return I’ll post a few pictures of the imaging train as it is now and the inside/outside of the ota. But no, the dovetail bar does not extend past the end of the ota.

 

Thanks Again,

 

Steve

 

From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, February 03, 2016 10:12 AM
To: ap-gto@...
Subject: Re: [ap-gto] Re: Reflections in Images

 

 

Do the dovetail bars extend past the front of the OTA?  If so that could be a contributing factor.

joel

 

On Wed, Feb 3, 2016 at 9:10 AM, 'Steven Reilly' sreilly24590@... [ap-gto] <ap-gto@...> wrote:

 

Thanks Stefan. I will be looking closer at the ota for anything that might help.

 

Steve

 

From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, February 03, 2016 1:00 AM
To: ap-gto@...
Subject: [ap-gto] Re: Reflections in Images

 

 

Steve,

I have seen some strange artifacts on GSO RC's that came from "false" light directly hitting the chip because either primary and/or seconday baffles were a bit to short. This risk for this increases with chip size. The artifacts have been linear and not circular as in your case, though.

Stefan

 

 

 

--

Stuart Heggie

http://www.stuartheggie.com/featured.html