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Subject: [M]: 8" LX200 and Starlight Express MX7-C
From: Doug David
Reply To: mapug@shore.net
Date: Wed May 30 11:28:41 2001
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Hi,
I have a Meade 8" LX200 and am considering a Starlight Express MX7-C for
astrophotography. My question is, for an 8" LX200, which focal reducer would
perform better for deep space pictures, the f3.3 or f6.3? Pixel size of the
MX7-C is 8.6 x 8.3uM. If I am correct in using the following to obtain 2 arc
seconds per pixel (formulas from Starlight express)
F = Pixel size * 205920 / Resolution (in arc seconds)
In the case of the MX7-C and a 2 arc seconds per pixel resolution:
F = 0.0082 * 205920 / 2 = 844mm
For a 203mm (8") SCT, this is an F ratio of 844 / 203 = F4.15, which falls
right in the middle of the F3.3 and F6.3 reducers. So which one would
perform better?
Doug
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