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09-06-2008, 10:28 AM   #1
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Focus speed of Pentax 55-300mm vs Tamron 70-300mm

Well it's time for soccer season once again. I have been using my Tamron 70-300mm Di lens, but my K100D sure wouldn't mind a little AF help. I found that the front element of the Pentax 55-300mm does not rotate, while my Tamron does. Do you think that would effect the AF speed (ie make the Pentax faster)?

I'm usually using the lense between 100-240mm, 1/500, f8. The extended range of the Pentax is a bit apealing, since I only have the Kit 18-55mm and the FA50 right now. But I don't want to spend $ and get nothing in return.

Thanks!

09-06-2008, 10:37 AM   #2
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The 55-300 is said to be a slow focuser.
09-06-2008, 10:49 AM   #3
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This would be a good opportunity to learn to focus manually. DOF is on your side for what you want to do.
09-06-2008, 11:13 AM   #4
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I have both lenses, neither are speed demons. The 55-300 hunts less and sometimes I use quickshift to obtain a rough focus point and then nail it with the AF in difficult conditions. The Tamron doesn't have quickshift so it cycles from end to end when it doesn't get focus lock which is infuriating.

The Tamron is good value, but the 55-300 is better made and optically a superior lens, well worth the extra.

None of the consumer zooms are fast focussing, only the DA*200 & 300, or Sigma 100-300 EX are quick focussing, but financially challenging!

09-06-2008, 11:54 AM   #5
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QuoteOriginally posted by Richard Day Quote
I have both lenses, neither are speed demons. The 55-300 hunts less and sometimes I use quickshift to obtain a rough focus point and then nail it with the AF in difficult conditions.
that's the way i've been using my lens. so far it's worked well. if your focus distances don't change too much afterwards, the focusing isn't so bad.
09-06-2008, 07:43 PM   #6
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Thanks for the replies. I guess the only AF advantage the Pentax would have is quick shift focus, though it sounds like it has proven to be optically superior.
09-07-2008, 10:02 PM   #7
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How about CA?

I was going though yesterdays soccer pics tonight. My oldest son's uniform is white on black. But for some reason, some shots show his uniform as white on black with a purple outline! The CA of the Tamron hadn't really bothered me before, but know I know exactly where to look for it. Does the Pentax have CA problems?
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Last edited by Vmax911; 09-07-2008 at 10:19 PM. Reason: attached a crop
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