#1  
Old 23-10-2007, 04:14 PM
EzyStyles's Avatar
EzyStyles (Eric)
I HATE COMA!

EzyStyles is offline
 
Join Date: Jan 2006
Location: Melbourne, Victoria
Posts: 3,208
FOV from 300D to 40D?

Hi Guys,

I don't get pixel size relative to chipset size. To put it to the simplest context, will i get a bigger field of view from 300d upgrading to a 40d? or a smaller fov? or the same?

Thanks.
Reply With Quote
  #2  
Old 23-10-2007, 04:26 PM
[1ponders]'s Avatar
[1ponders] (Paul)
Retired, damn no pension

[1ponders] is offline
 
Join Date: Nov 2004
Location: Obi Obi, Qld
Posts: 18,778
Can you give the pixel size and chip size?

And is that with your 10" f4.7?
Reply With Quote
  #3  
Old 23-10-2007, 04:29 PM
EzyStyles's Avatar
EzyStyles (Eric)
I HATE COMA!

EzyStyles is offline
 
Join Date: Jan 2006
Location: Melbourne, Victoria
Posts: 3,208
Canon 300d:
3072 x 2048 pixel
Pixel size: 7.1 x 7.1 uM
Chip size: 22.7 x 15 mm

Canon 40d:
3888 x 2592 pixel
Pizel size: 5.7 microns square
Sensor size: 22.2 x 14.8 millimeters
Reply With Quote
  #4  
Old 23-10-2007, 04:33 PM
[1ponders]'s Avatar
[1ponders] (Paul)
Retired, damn no pension

[1ponders] is offline
 
Join Date: Nov 2004
Location: Obi Obi, Qld
Posts: 18,778
OK just checked it has the same chip size and pixel size as the 400D

Your field of view with the 10" @ f/4.7 is 43.2 x 64.8 acrcmin

With the 300D it is 44.3 x 66.4 so almost the same.
Reply With Quote
  #5  
Old 23-10-2007, 04:34 PM
[1ponders]'s Avatar
[1ponders] (Paul)
Retired, damn no pension

[1ponders] is offline
 
Join Date: Nov 2004
Location: Obi Obi, Qld
Posts: 18,778
You need to download yourself the CCD Calculator from New Astronomy Press Eric. I'd be lost without it
Reply With Quote
  #6  
Old 23-10-2007, 04:52 PM
EzyStyles's Avatar
EzyStyles (Eric)
I HATE COMA!

EzyStyles is offline
 
Join Date: Jan 2006
Location: Melbourne, Victoria
Posts: 3,208
arh Paul, you always there when i need help thanks buddy. so that slight increment: 43.2 x 64.8 acrcmin and 44.3 x 66.4 from the 300d, that means the object will be bigger?
Reply With Quote
  #7  
Old 23-10-2007, 05:13 PM
[1ponders]'s Avatar
[1ponders] (Paul)
Retired, damn no pension

[1ponders] is offline
 
Join Date: Nov 2004
Location: Obi Obi, Qld
Posts: 18,778
Yes the objects will be slightly bigger but your field of view will be slightly smaller. Also your image scale will go from 1.3 to 1 arcsec/pixel. Shame you can't use a FR with your setup, you are basically wasting 1 arcsec/pixel in resolution (in good seeing, more than that normally) that could be used to increase your sensitivity.
Reply With Quote
  #8  
Old 23-10-2007, 09:25 PM
Terry B's Avatar
Terry B
Country living & viewing

Terry B is offline
 
Join Date: Mar 2006
Location: Armidale
Posts: 2,764
I looked at the sensor sizes you quoted. Is there a difference between the actual sensor size and the effective sensor size? This is often quoted in the camera specs. Sometimes part of the edge of the array is not used for imaging. If so then the array sizes may be almost identical.
The only things that determine your field of view are the effective array size and the lens you look through (scope). The number of pixels only changes the resolution not the size of the field.
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 11:44 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Advertisement
Lunatico Astronomical
Advertisement
Bintel
Advertisement
EQ8-R
Advertisement
Astromechanics
Advertisement
Star Adventurer
Advertisement
Celestron RASA
Advertisement
Astronomy and Electronics Centre
Advertisement