Quote:
Originally Posted by OneCosmos
Thanks Nik - I did kind of assume the diameter of the front element was the determining factor - just like a telescope really, but the amount of light captured mist still be affected by the focal ratio because f/1.4 still needs less exposure time that f/5.6 irrespective of the size of the front element in camera lens at least.
Also fast lenses do have far bigger front elements than their slower counterparts. Zoom lenses are a further complication.
Coming back to my question then, there is no fixed answer as to which size camera telephoto lens is the equivalent of my Takahashi fsq-85 f/5.3 refractor?
Chris
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I assume the 85mm is the front element?
I thought you were referring to an 85mm focal length camera lens.
In those cases the one with a larger front lens will capture more detail yet will be slower in terms of time capturing that light than a faster lens.