#1  
Old 20-10-2015, 08:55 AM
Camknox (Cameron)
Registered User

Camknox is offline
 
Join Date: May 2012
Location: Kalgoorlie, WA
Posts: 57
Flats

Hi folks,

I've been doing astrophotos for a bit now but I've never bothered with shooting flats, I sometimes use darks but not always. I've got myself a light box; homemade using an EL panel and some foam etc.

I've tried some sample shots and I'm not sure what I should be aiming for here. So with that in mind;

1. How long and what settings should I be exposing at? For example if my lights are 180s @ 800ISO f/0 my flats should be?

2. Is this a constant? I use APT for my image acquisition and it suggests a flat should be using the same ISO and I guess it determines the exposure time as it wont let me enter it.
Reply With Quote
  #2  
Old 20-10-2015, 09:51 AM
Atmos's Avatar
Atmos (Colin)
Ultimate Noob

Atmos is offline
 
Join Date: Aug 2011
Location: Melbourne
Posts: 6,339
Flats should be taken at the same ISO and optical configuration but the exposure time should just be as long as it takes to bring your histogram to 50-75% of saturation.
Reply With Quote
  #3  
Old 20-10-2015, 11:14 AM
rustigsmed's Avatar
rustigsmed (Russell)
Registered User

rustigsmed is offline
 
Join Date: Mar 2012
Location: Mornington Peninsula, Australia
Posts: 3,171
Hi cam,

Point to a blank part of the sky after sunset, turn the canon setting from manual to Av, and start snapping away. It will choose the exposure time automatically. Easy as!

Rusty
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 07:46 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
SkyWatcher Australia
Advertisement
Astromechanics
Advertisement
Meade Australia
Advertisement
Celestron Australia
Advertisement
OzScopes Authorised Dealer
Advertisement
Lunatico Astronomical
Advertisement
Astronomy and Electronics Centre
Advertisement