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Old May 17, 2008, 2:27 AM   #1
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Looking for suggestions to use with my new K20D...is there a reason for both?
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Old May 17, 2008, 3:36 AM   #2
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Welcome on the forum, PK20D. You've found the right place to ask this and other questions.

Well, it's a cost–benefit issue. For any purpose, a high quality prime lens of the right focal lenght is thebest choice. And these two lenses are probably the best you can get.

The cons of buying both would be:

Cost, moneywise. You can get good results with the 200 mm lens and a good teleconverter or the Pentax AF Adapter 1.7. Thus you have two lenses in one at a lower cost and would get very good picture quality. If it's good enough is up to you. The tele converter should be very much cheaper than the 300 mm lens.

Cost, carrywise. Both lenses are pretty big and heavy. You might find that you don't want to carry a bag big enough to host both at the same time, so you'd have to decide before leaving home which one to bring. And then in field you will want the one you left at home.

Most amateurs wouldn't spend as much to get that last edge of picture quality, since at the end of the day the overall result depend more on the photographer than on the equipment. But on the other hand some of us (like myself) want to have the best (at a cost) to ensure that bad results are due to me and not to my equipment. Because I can learn and improve, the gear cannot.

Kjell
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Old May 18, 2008, 11:41 AM   #3
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Good points. Thank you. I am leaning to the 200 for the 2.8. Does the Pentax AF Adapter provide better results than the Tamron or Sigma?
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Old May 18, 2008, 1:19 PM   #4
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I purchased the DA* 300mm F4 and have no regrets. Much lighter than a full frame 300mm F4. I have been hand holding for some great BIF and Macro shots. Is still very sharp with Kenco 1.5X Teleconverter (450mm), but is slower to focus.

Will post sample of each. If you want more samples let me know.

K20D, DA* 300mm F4

Ed

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Old May 18, 2008, 1:20 PM   #5
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Great Egret Chick with 1.5X TC
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Old May 18, 2008, 1:21 PM   #6
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Old May 18, 2008, 1:22 PM   #7
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Old May 18, 2008, 1:23 PM   #8
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Old May 18, 2008, 1:24 PM   #9
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Old May 18, 2008, 3:15 PM   #10
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PK20D wrote:
Quote:
Good points. Thank you. I am leaning to the 200 for the 2.8. Does the Pentax AF Adapter provide better results than the Tamron or Sigma?

The Pentax Adapter is unique insofar that it has an built in Auto focus feature, thus when used with a manual lens it provides autofocus. I use mine withthe manual A* 85 mm and A* 200 mm lenses with good results.Besides being an auto focus adapter it is also a 1.7X tele converter.

The other converters mightallow AF with AF lenses, but I can't say anything abouttheir picture quality, I've never tried any of them.

Without a TC a 200 mm lens is too short for most wildlife and birding, but it's very useful for some scenery, portraits, street and candids. And concerts.

Kjell

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