Quote:
Originally Posted by JohnH
Yes you must re-focus between filters, and that will be a pita unless you automate. As for the results - depending on the quality of the glass the blue image will be bloated compared to the R and G even at best focus. You can compensate for this by softening the R and G - that is trade sharpness for colour - then use an L frame but the results will not be as good as with an APO.
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You cant shoot luminance with an Achro, this is its main downfall imo. As for individual rgb frames I cant see why they wouldn't work. The thing is that you are just going to reduce the bloating of each colour by reducing the wavelength range that gets to the sensor, the individual colour filters let through a range of wavelengths and these will still come to focus at different points.