>writes:
>>At 09:24 PM 5/23/99 -0500, you wrote:
>
>
>>>Tom Wideman
>>>Grapevine, TX
>>>
>>
>>This makes sense, should've realized... Still, doesn't the reduced
>>aperture
>>also reduce resolving power?
>>
>>Chris Margaritis
>
>On something as bright as the Sun the opposite should be true, in as, the
>effective f/ratio has change to a larger number the resolving power and
>contrast should increase..............ric

Huh? The theoretical resolution of a large aperture is always better
than that of a smaller one (everything else being held constant).
This has nothing to do with the brightness of the object being
viewed. (Contrast is another story.) But in real life we seldom get
seeing good enough to take advantage of the full resolution of our
scopes anyway. Especially in the daytime. Small off axis solar
filters are a good compromise.


Bill Arnett
http://www.seds.org/billa/
"I know that I am mortal and the creature of a day; but when I search
out the massed wheeling circles of the stars, my feet no longer touch
the earth, but, side by side with Zeus himself, I take my fill of
ambrosia, the food of the gods." -- Claudius Ptolemaeus (Ptolemy)

View index by [date] [author] [subject]
Previous message: Re: [M]: Solar Filters, R. A. Greiner
Next message: [M]: Solar Filters, Doug Kranz
Next message in thread: [M]: Solar Filters, Doug Kranz
Previous message in thread: Re: [M]: Solar Filters, R. A. Greiner