PowerShot Fans have some new toys to enhance their photography needs. First it
was shutter speed overrides from 65 seconds to 1/64,000 of a second. All with
perfect flash sync mind you. Something that focal-plane shutters, i.e. DSLRS,
can NEVER and will NEVER do. Then it was getting new f/stops to f/16. Then we
got high-speed Tv, Av, ISO, and Focus bracketing to as many frames as you need
by any step value that you desire. But it just keeps getting better and better.
Now you can do astrophotography frame stacking IN YOUR CAMERA. Also useful for
special effect or strobe-stop multi-frame motion studies without using any
editing software to merge your images, just by using menu options in your camera
alone. There's also a new in-camera "RAW Develop" feature so that you can
process your RAW file into a JPG file for in-camera review of your desired
results. No need to even load your files into a computer and using RAW editing
software to see your stacked images. Do it all IN YOUR CAMERA.
The new "RAW Merge Sum" feature allowing you to take many minutes or hours long
exposures at any ISO that you want with no noise issues. The more frames stacked
the more the noise that gets averaged out. Summed & Averaged noise being an
inverse-square function. Average 4 frames together to get 1/2 the noise levels
or one ISO setting lower. 16 frames taken at ISO800 will give you the noise
levels as if taken at ISO100, (the square root of 16, or 4EV steps lower). Use
the "RAW Merge Avg" feature to obliterate any noise issues when using high ISOs
at high shutter speeds without affecting exposure levels, as would happen with
the "Sum" process.
For further information see:
http://chdk.wikia.com/wiki/CHDK_firmware_usage/AllBest
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