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Old 09-11-2018, 08:36 AM
Jethro777 (Jethro)
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Jethro777 is offline
 
Join Date: Oct 2012
Location: Brisbane
Posts: 131
Quote:
Originally Posted by Merlin66 View Post
Jethro,
Have you looked at CCDCalc?
http://www.newastro.com/book_new/camera_app.html
This allows you to enter the lens and camera parameters and shows the image size using various astronomical objects as a guide.....
Thanks, I will need to give this some more thought. As I am using a 100mm Minolta f/2.8 and a Sony SLT-A77V only, I am not sure how to use it, and to understand exactly what it does for me yet.


Quote:
Originally Posted by bojan View Post
For flats, I used tracing paper placed to cover the lens and clear blue sky...

Take couple of exposures (histogram should have maximum at ~1/3), DSS will make the master flat, which you can use from then on (just make sure that for actual imaging you use the same camera, same lens, same f-stop).
That's helpful. So really, I can make a set of 'master flats' of likely apertures I will use for my lens and reuse them.

Can I do the same for Darks / Bias or do these need to be done on the night?

I was wondering what exactly can be blended together in DSS when it comes to 'Lights'. Not aperture? Not ISO?
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