There would be quite a few factors impacting the limiting aperture.
Coincidently there was a GRS transit this evening and as I have a set of aperture masks, I swung my ED103 over to Jupiter at about 8.30 to have a look. The GRS was near mid transit.
I was quickly down to my smallest aperture mask at 60mm. The image was starting to get dimmer, but the GRS was still very obvious. Under tonight's seeing conditions limiting aperture would have been lower than the 60mm.
103mm f7.7 refractor stopped down, 8mm eyepiece giving 100X
Quote:
Originally Posted by morls
I wonder what the limiting aperture would be at the moment?
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