Quote:
Originally Posted by Rod1448
Martin,
The DSLR photos are still very good but just not as much colour and sharpness. Do you still use the duoband filter on the south coast? Also do you use a filter wheel, it seems like a good idea but does it add to much length between camera or maybe even a weak point?
The 8" appears to have a good field of view. Again my ignorance, what is the APS-c sensor?
Cheers
Rod
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Rod
The big difference between a DSLR and a cooled CMOS camera ( mono with filter wheel or OSC One Shot Colour ) is the sensor temperature
The DSLR in Winter runs approx at 18degC and Summer 30degC plus , high sensor temperature causes dark current or dark noise which makes your images grainy
Cooled Mono and OSC can be cooled to -20Deg C or lower which reduces dark current or dark noise to just about nothing
Filter wheels are used with cooled Mono cameras only as they need the colour filters to produce a colour image. Cooled OSC cameras have in built filter wheel called a Bayer Matrix ( same as a DSLR too ) so you don’t need a separate filter wheel. I only use a DSLR and a cooled OSC camera
An APS-C sensor is a term for crop sized sensor or a reduced size full frame sensor , it’s usually 22mm x 15mm
Full frame in an 8” f5 would be a waste as most objects can be framed with spare view with a crop sensor or APS-C sensor
I use the Duoband down the coast only when the moon is up
In Sydney I use it most of the time due to heavy light pollution although you don’t need to use it on globular star clusters as your not capturing nebulosity etc just a big bunch of tightly condensed stars
Martin