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The answer is both yes and no.aperture determines the amount of photons entering the telescope BUT a focal reducer increases the amount of photons hitting each pixel.
To illustrate. A 16” F/8 RC with KAF-16803 and a flattened gives a pixel scale of 0.57”/pixel. With a 0.7x reducer it is reduced to F/5.6 so 0.86”/pixel.
The 16” of aperture determines the flux; the rate of photons entering the system to square arcsec of sky. The focal ratio determines the how that flux is spread across each pixel. So let’s say one shock front delivers 10 photons per hour per square arcsec with 16” aperture.
At F/8 you’re getting 3.25 photons per pixel per hour but at F/5.6 that increases to 7.34 photons per hour per pixel.
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