Go to a  "printer friendly" view of this message which allow an easy print Printer-friendly copy Go to the page which allows you to send this topic link and a message to a friend Email this topic to a friend
Forums Lobby GET TO KNOW YOUR CAMERA & MASTER IT Nikon D90/D80/D70 (Public) topic #251813
View in linear mode

Subject: "RE: D80 RAW format problem-- making a dark flat for ast..." Previous topic | Next topic
elec164 Silver Member Nikonian since 15th Jan 2009Wed 12-Sep-12 03:00 PM
1968 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#5. "RE: D80 RAW format problem-- making a dark flat for astrophotography not working"
In response to In response to 4


US
          

>On the terminology, I think I meant a "dark" as
>opposed to a "dark flat", which is indeed as you
>describe.
>

OK, just wanted to be sure. There is a flat field correction, but that is generally not used for astrophotography I would think.


>FYI, I've put two images here, one a dark taken as a RAW/NEF
>(whihc looks terrible) and one taken as a jpg, which looks the
>way I think it should look:
>

I downloaded the NEF and opened it in Photoshop CS3 and it appeared black as I expected it to be. I then adjusted levels to bring out any possible sensel variation and a few pixels appeared, but nowhere near what you described. So it appears that it is possibly PSP X2 that is giving you a false rendering.

Pete

Visit my Nikonians gallery.

  

Alert Printer-friendly copy | Reply | Reply with quote

A topic tagged as in need of helpD80 RAW format problem-- making a dark flat for astroph... [View all] , Dr Garry , Tue 11-Sep-12 11:19 AM
 
Subject Author Message Date ID
Reply message RE: D80 RAW format problem-- making a dark flat for ast...
elec164 Silver Member
11th Sep 2012
1
Reply message RE: D80 RAW format problem-- making a dark flat for ast...
gkaiseril Gold Member
11th Sep 2012
2
Reply message RE: D80 RAW format problem-- making a dark flat for ast...
Dr Garry
11th Sep 2012
4
     Reply message RE: D80 RAW format problem-- making a dark flat for ast...
elec164 Silver Member
12th Sep 2012
5
          Reply message RE: D80 RAW format problem-- making a dark flat for ast...
Dr Garry
13th Sep 2012
6
Reply message RE: D80 RAW format problem-- making a dark flat for ast...
aolander Silver Member
11th Sep 2012
3

Forums Lobby GET TO KNOW YOUR CAMERA & MASTER IT Nikon D90/D80/D70 (Public) topic #251813 Previous topic | Next topic


Take the Nikonians Tour and learn more about being a Nikonian Wiki /FAQ /Help Listen to our MP3 photography radio channels Find anything on Nikon and imaging technology - fast!

Copyright © Nikonians 2000, 2014
All Rights Reserved

Nikonians®, NikoScope® and NikoniansAcademy™ are trademarks owned by Nikonians.org.
Nikon®, Nikonos® and Nikkor® are registered trademarks of Nikon Corporation.