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View Full Version : Any "sweet-spot" conversions?

kevhun
29th of March 2005 (Tue), 19:25
does anyone have any thoughts on if the "sweet-spot" aperture (f/8) is consistent with the 10d/20d/etc x1.6 focal conversion rate?
thanks-
kevin
Citizensmith
29th of March 2005 (Tue), 20:20
The 'sweet spot' appeture is dependant on the lens optics. The body you mount it on makes no difference what so ever.
kevhun
29th of March 2005 (Tue), 21:00
i kinda thought so...thanks for the reply
kevin
drisley
30th of March 2005 (Wed), 00:52
The sweet spot on my 135F2L is any aperture between F2 and F22
:)
Andy_T
30th of March 2005 (Wed), 03:46
One general idea is that the 'sweet spot' of any lens is maybe 2 stops down from the largest aperture.

So if you have the 50/1.8, you'll get great pictures at f/2.8 or f/3.5, while the 18-55/3.5-5.6 will have to go to f/8 at the long end to deliver optimal performance.

For 'L' lenses, the claim very often is that they are tack sharp even wide open, with the 135/2.0 being a prime example.

Best regards,
Andy