#1  
Old 31-03-2010, 07:03 AM
alan meehan's Avatar
alan meehan
Registered User

alan meehan is offline
 
Join Date: Jul 2005
Location: maryland newcastle AUSTRALIA
Posts: 1,549
new toy cooled 40d

Well i have finally got my my new toy back from central ds where i had a cooling unit added and modded,i have given it a test and have dropped from 26deg down to 0.1deg so iam happy with the cooling .the whole unit is fairly heavy weighs in at 1.2 kg but my jmi focuser handles it with no problems ,now all i need is some good weather to try it out.
ALAN
Attached Thumbnails
Click for full-size image (IMG_0159_1.JPG)
47.0 KB44 views
Click for full-size image (IMG_0161_1.JPG)
41.6 KB44 views
Click for full-size image (IMG_0162_1.JPG)
45.0 KB41 views
Click for full-size image (IMG_0163_1.JPG)
42.7 KB39 views
Reply With Quote
  #2  
Old 31-03-2010, 07:25 AM
[1ponders]'s Avatar
[1ponders] (Paul)
Retired, damn no pension

[1ponders] is offline
 
Join Date: Nov 2004
Location: Obi Obi, Qld
Posts: 18,778
You've been hanging around h0ughy too long Al

Nice buy mate. Look forward to first light and then the real test. Astrofest light
Reply With Quote
  #3  
Old 31-03-2010, 03:27 PM
Lester's Avatar
Lester
Registered User

Lester is offline
 
Join Date: Jan 2006
Location: E.P. S.A.
Posts: 4,963
Hi Alan, good purchase. I got them to modify a 40D for me a few years back and it cools to 17 degrees below ambient. I was interested to read the temperature drop you recorded, perhaps they are using a better peltier than before.

All the best with it.
Reply With Quote
  #4  
Old 31-03-2010, 04:24 PM
Paul Haese's Avatar
Paul Haese
Registered User

Paul Haese is offline
 
Join Date: Jan 2009
Location: Adelaide
Posts: 9,403
I still have my 40D and it works a treat. I am planning on using it with a 200mm for those lovely wide fields that many people seem to produce.
Reply With Quote
  #5  
Old 31-03-2010, 05:48 PM
avandonk's Avatar
avandonk
avandonk

avandonk is offline
 
Join Date: Aug 2005
Location: Melbourne
Posts: 4,786
Alan when my Peltier fridge is at -10.0C the sensor is at 7.0C. I have measured the temperature rise of the sensor in my Canon 5DH when continuously exposing. This temperature rise above ambient is 17C! I would imagine that a 40D would rise a bit less than this.

Your 40D with the sensor directly cooled will have far less noise even at a sensor temperature of 7.0C. I would imagine the trick would be to drop the sensor temperature to a level where condensation just occurs. Then warm up to clear the sensor and stay above this sensor temperature for these ambient conditions.

The dew point would be the important parameter here. What would help is some mild heating from a dew strap around the lens or telescope barrel to raise the dew point inside the lens or telescope barrel. A filter or clear window with anti reflection coating mounted as close to the sensor as you can manage would stop fresh moist air forming condensation on the sensor.

If I don't continuously expose with dummy exposures when the fridge gets below about 0C to -5C I get condensaton.


Hope my ramblings give you some ideas. Looking forward to what you can achieve with your new cooled 40D. It is well worth it as the dim stuff is at or below the noise levels of uncooled cameras.

I can only imagine what a Canon sensor would do at -40C!

Bert
Reply With Quote
  #6  
Old 31-03-2010, 08:23 PM
strongmanmike's Avatar
strongmanmike (Michael)
Woohoo it's clear

strongmanmike is offline
 
Join Date: May 2006
Location: Canberra
Posts: 14,704
Looks awesome AL!

Hope it proves just the trick

..?..just something about big black cameras

Mike
Reply With Quote
  #7  
Old 01-04-2010, 08:18 AM
dugnsuz's Avatar
dugnsuz (Doug)
to baldly go...

dugnsuz is offline
 
Join Date: Aug 2005
Location: Hahndorf, South Australia
Posts: 4,200
I look forward to hearing how you go with this Alan as this mod has been on my wish list for a long while now.
Wow - it dropped 26 degrees on the bench eh!!??
Very promising.
Doug
Reply With Quote
  #8  
Old 01-04-2010, 10:39 AM
RB's Avatar
RB (Andrew)
Moderator

RB is offline
 
Join Date: Aug 2005
Posts: 21,987
Alan congrats on the new cooled camera mate, looking forward to seeing the results.



Quote:
Originally Posted by [1ponders] View Post
You've been hanging around h0ughy too long Al
Mr Ponderosa, leave Hoss alone.....
Reply With Quote
  #9  
Old 01-04-2010, 11:37 AM
jjjnettie's Avatar
jjjnettie (Jeanette)
Registered User

jjjnettie is offline
 
Join Date: Feb 2005
Location: Far Far Away
Posts: 16,726
Congratulations Al. I'm keen to see some images!!
Reply With Quote
  #10  
Old 02-04-2010, 06:58 AM
Garyh's Avatar
Garyh
Amongst the stars

Garyh is offline
 
Join Date: Jun 2006
Location: Glen Innes, N.S.W.
Posts: 2,839
Nice! Sounds similar to cooling capacity and weight to my home modded 40D but nice and professional!
I find sitting at 5 degrees gives me practically no noise..
You`l have fun with this!
Reply With Quote
  #11  
Old 04-04-2010, 05:43 PM
allan gould's Avatar
allan gould
Registered User

allan gould is offline
 
Join Date: May 2005
Location: Brisbane
Posts: 4,481
Hope you get all this sorted and obtain some great images
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 08:19 PM.

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