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1 minute ago, Mr Spock said:

If people stop using a word to mean something different to it's original meaning there isn't an issue :wink2:

I sense we are getting there - could you say the word and original meaning (and why does it originally mean what it means :D )

 

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Fast relates to photography.  Smaller focal or "f" ratios (the focal length divided by the aperture in matching units) require shorter exposures to reach a given image density so images can be taken "

Now this is a fast telescope. 😁

So many "cans of worms" in AP it's surprising that it doesn't come under Biology.      😄

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On 09/02/2020 at 17:13, Barry-W-Fenner said:

I have tried to understand this thread, but ultimately, it has given me a major brain fart...

 

Baz

Same here...

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On 09/02/2020 at 17:13, Barry-W-Fenner said:

I have tried to understand this thread, but ultimately, it has given me a major brain fart...

 

Baz

Okay, maybe this will help? M8 in just 30 seconds with a 8" F2.9 (ultrafast) scope!

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On 23/12/2019 at 15:51, Stu said:

So long as you don't misunderstand and believe that you would get a brighter image at the same magnification with a faster scope then they are useful terms still I think.

So, a faster focal ratio doesn't provide a brighter image visually, but it does provide a brighter photographic image at the same shutter speed? Is this right? Why not a brighter image visually?

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