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11-01-2006, 07:40 PM   #1
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Are "3rd party" lenses as fast at focusing?

I heard they are not as fast...

any comments to this matter?

K100d or K10d mounted


11-01-2006, 09:40 PM   #2
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both sigma and tamron hunts in low light, longer range zooms even more so

Pentax is better in general in terms of Af speed and accuracy

The exception may be sigma 300/2.8 EX not DG that i had tried on canon body when i rented the lens overseas (amazing)

If I had seen various good reports regarding tamron 17-50/2.8 being fantastic comparing to any canon nikon or zeiss(f3.5) , (pentax counterpart coming out soon with k10d), AF speed is not that curcial in this range i reckon

but i would go for everything pentax if i stick to pentax brands hehe
11-23-2006, 05:05 PM   #3
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Well in my personal point of view it is very lens dependant.
Which goes for both Pentax and the third party makers.

I had the FA 43 LTD for a while and yep it were fast indeed.
My FA 28-105 is slow.

My sigma 105 macro is slow, but considering it is a macro it does OK.
My sigma 17-70 is fast, not as fast as the FA43LTD, but being a prime it should be faster.
My Sigma 70-200 f2.8 is a fast one, faster than the 17.70 on my K100D.

I think it is lens, camera and power dependant, not manufakturer dependant per se.
Just my 2c.

Having said that, I am mostly into landscapes and occational portraits and macros, this is mostly manual focus work anyhow.

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