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Old Feb 21, 2007, 11:15 AM   #1
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Are there lenses that are noticeable faster with the AF than others? If so - which one? As I understand this is a lens thingie - more precise a mechanical problem.

Since I like composing a zoom lens would be good (doesn't have to be super zoom).

Best case would be a lens brighter than my Pantax kit lens, with my current zoom I mostly used something between 55-128mm (soccer indoor & outdoor) so I guess something in that range would work. Sharp&clear pic is more important than big zoom.

I don't mind getting an older/non digital lens - the wide is not important here.

Any recommendations here? A budget friendly solution would be nice since I don't know how important these events will be in the future.

TIA,
Th.
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Old Feb 21, 2007, 11:59 AM   #2
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Lenses with the lowest stop number e.g f1.2 is faster than f1.4

is faster than f1.8 is faster than f2.0 is faster than f2.8 and so on, look at the Web

and the forums compare the results and see what you fancy and can afford.
lenses with quiter faster focusing use various abreviations. eg HSM

http://en.wikipedia.org/wiki/Ultrasonic_motor





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Old Feb 21, 2007, 5:22 PM   #3
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the smaller and lighter the lens, the quicker the focus.

The 18-55 kit lens I thought was bad. The 50-200 was even slower but still OK.

I imagine the little pancake 40mm lens would be very fast-focusing.
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Old Feb 21, 2007, 11:27 PM   #4
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Actually I think my SIGMA 70-300 focuses just as fast maybe even faster than the kit lens... (and has pretty much the same end to end F range 3.5/4 to 5.6)
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Old Feb 21, 2007, 11:29 PM   #5
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mongrelchild wrote:
Quote:
I imagine the little pancake 40mm lens would be very fast-focusing.
Those little pancakes come with a HEAFTY price for what they are though.
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Old Feb 22, 2007, 2:53 AM   #6
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Thanks for the replies so far. It IS a internal mechanical thingie, it's juat difficult to translate what I mean... hm.

I was more hoping for your personal experiences - like the reference to the 70-300mm Sigma.


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Old Feb 22, 2007, 3:07 PM   #7
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It looks like the new lenses Pentax is releasing this spring will be really fast AF, if you can afford the price tag.
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Old Feb 22, 2007, 3:42 PM   #8
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The new Pentax lenses will be very fast focusing with the K10D beause they will have silent motor screw drive, but they will be expensive, just like the FA* lenses were (still are) in the film days.

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