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I have one for and one against for 1/4 aperture.
For: - My DSLR was shutter had to be set to 1/1000th to take a reasonable image. My webcam required filters to reduce the light level, and that is with a 1/4 aperture on my 12" DOB. Imagine what would happen if I had a full aperture.
Con: - Only slight issue and not really a problem, the line up of the CCD and CMOS needed to search for the sun. This was tested with a full aperture Finder scope solar filter and found this to be a problem when I set up the filter in different quadrants on the secondary section of the DOB.
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