Go Back   IceInSpace > Beginners Start Here > Beginners Talk

Reply
 
Thread Tools Rate Thread
  #1  
Old 26-04-2021, 05:02 PM
evltoy (Wayne)
Registered User

evltoy is offline
 
Join Date: Sep 2020
Location: Melbourne
Posts: 85
Quick question when taking flats

Hi All,

I'm planing to use my baader moon & sky glow filter on some objects soon.

After my session when I do my Darks and Flats (white T-Shirt), do I require to keep my filter on when doing them?

Thanks
Wayne
Reply With Quote
  #2  
Old 26-04-2021, 05:32 PM
brisen (Brian)
Registered User

brisen is offline
 
Join Date: Aug 2013
Location: Caboolture, Australia
Posts: 269
Hi Wayne

You will need to keep the filter on and also not rotate the camera before taking the flats. This will ensure any dust spots and vignetting are the same as the lights you took.

Brian
Reply With Quote
  #3  
Old 26-04-2021, 05:35 PM
evltoy (Wayne)
Registered User

evltoy is offline
 
Join Date: Sep 2020
Location: Melbourne
Posts: 85
Thank you very much Brian for the clarification
Reply With Quote
  #4  
Old 27-04-2021, 07:43 AM
multiweb's Avatar
multiweb (Marc)
ze frogginator

multiweb is offline
 
Join Date: Oct 2007
Location: Hinchinbrook
Posts: 20,637
+1 same focus as well and temperature.
Reply With Quote
  #5  
Old 27-04-2021, 12:43 PM
evltoy (Wayne)
Registered User

evltoy is offline
 
Join Date: Sep 2020
Location: Melbourne
Posts: 85
Yeah. focus and camera position I can do for both Darks and Flats, but Temp is a no go for me with Flats. Darks on the other hand gets done after right after a session, so temp would be roughly the same as the lights.
Reply With Quote
  #6  
Old 29-04-2021, 08:55 AM
multiweb's Avatar
multiweb (Marc)
ze frogginator

multiweb is offline
 
Join Date: Oct 2007
Location: Hinchinbrook
Posts: 20,637
Quote:
Originally Posted by evltoy View Post
but Temp is a no go for me with Flats.
I meant as long as you take your light flats and dark flats at the same temp you'll be alright.
Reply With Quote
  #7  
Old 23-05-2021, 04:01 PM
evltoy (Wayne)
Registered User

evltoy is offline
 
Join Date: Sep 2020
Location: Melbourne
Posts: 85
Sorry for bringing up this topic again... I'm still learning the ropes.

If I was using a dew shield on my scope (SCT) do I need to leave it on when doing flats?

I also stumbled on this item https://www.officeworks.com.au/shop/...and-ssod8119a3 and was wondering if this would help take flats after a session in the dark?
Reply With Quote
  #8  
Old 23-05-2021, 04:22 PM
AdamJL
Registered User

AdamJL is offline
 
Join Date: Sep 2010
Posts: 511
Hi Wayne

I would leave the dew shield on, not because it's necessary to match your lights, but anything to keep extra light out is good You want even illumination. But to be honest, this is one of the things you can do with or without. An even, white field is what you're after.

For the second question, yes that's great. I recently made something to hold something almost identical (ordered from Amazon, not Officeworks) for my refractor.

Here are some images, and with it being used last night.
Attached Thumbnails
Click for full-size image (20210501_060127658_iOS.jpg)
131.9 KB23 views
Click for full-size image (20210501_060153847_iOS.jpg)
145.6 KB26 views
Click for full-size image (20210522_091709290_iOS.jpg)
106.5 KB25 views
Reply With Quote
  #9  
Old 24-05-2021, 01:11 PM
Craig_
Registered User

Craig_ is offline
 
Join Date: May 2020
Location: Sydney
Posts: 173
Quote:
Originally Posted by multiweb View Post
+1 same focus as well and temperature.
How does focus work when using an AF unit? That will naturally refocus automatically throughout the night. Is this sort of tiny temperature-induced focus changes "close enough" for flats? Becuase you wouldn't want to be shooting flats before every autofocus run.
Reply With Quote
  #10  
Old 24-05-2021, 02:27 PM
evltoy (Wayne)
Registered User

evltoy is offline
 
Join Date: Sep 2020
Location: Melbourne
Posts: 85
Quote:
Originally Posted by AdamJL View Post
Hi Wayne

I would leave the dew shield on, not because it's necessary to match your lights, but anything to keep extra light out is good You want even illumination. But to be honest, this is one of the things you can do with or without. An even, white field is what you're after.

For the second question, yes that's great. I recently made something to hold something almost identical (ordered from Amazon, not Officeworks) for my refractor.
Thanks for the info.. going to get me one of these light pads

Quote:
Originally Posted by Craig_ View Post
How does focus work when using an AF unit? That will naturally refocus automatically throughout the night. Is this sort of tiny temperature-induced focus changes "close enough" for flats? Becuase you wouldn't want to be shooting flats before every autofocus run.
Very interesting.
Reply With Quote
  #11  
Old 24-05-2021, 02:33 PM
multiweb's Avatar
multiweb (Marc)
ze frogginator

multiweb is offline
 
Join Date: Oct 2007
Location: Hinchinbrook
Posts: 20,637
Quote:
Originally Posted by Craig_ View Post
How does focus work when using an AF unit? That will naturally refocus automatically throughout the night. Is this sort of tiny temperature-induced focus changes "close enough" for flats? Becuase you wouldn't want to be shooting flats before every autofocus run.
Yes it's fine. If the focus is close enough the dust motes will match up.
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 03:05 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
Limpet Controller
Advertisement
NexDome Observatories
Advertisement
Testar
Advertisement
Astronomy and Electronics Centre
Advertisement