Hi All,
Well, I have done some testing and data collection on the new DIY DSLR cooler box that I based on Gary Honis' design with an aluminium chamber, peltier cooler and two CPU fans with the external one, mounted on the hot side of the peltier and fitted with a pretty solid heatsink.
I had the camera loaded in the box and tonight installed the dual sensor digital temperature gauge so I could see how the chamber temperature dropped while I was watching some TV.
I didnt have the camera on, however I collected a solid 2 and a half hours of temperature readings, measured each half an hour to plot the results, in case anyone wants to see how this little sucker performs.
My previous readings that were taken off the EXIF data reported by Backyard EOS only and didnt really have any accurate ambient readings to gauge how many degrees drop I was achieving (estimated about 7-10 degrees.)
So, here are the results of my testing. I have combined all the pictures I took at 30 minute increments and also added a chart showing the plots of the temperature and the delta T.
Looks pretty good, I am achieving a passive (inactive camera) stable chamber drop of about 11.8 degrees C below ambient temp
which is great considering anything above 13 deg C shows up horribly on the sensor of my Canon 1000D.
Whats shown by the data and really good is that the cooler drops to about 10 deg C below ambient after only an hour of run time
Not bad for a knocked up piece of aluminium, some foam, a peltier and some CPU fans from a seconds bin at the local PC shop....
I have attached some pics of the box also.
Hope this is of interest.
Cheers
Chris