Megapixels and Printing sizes
OK, most DSLRs are about 8-12MP so that means according to various sources on the web that you could probably get a quite decent print at about 20X30cm.
Now the question is.....suppose you are doing narrowband imaging so only a portion of the pixels are utilized....how does that affect the quality of the print in the cases
1. SHO imaging
2. Ha imaging
3. HA + RGB imaging
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