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08-01-2007, 04:12 PM   #1
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So.... (Another Budget Tele Thread)

So guys, what AF telezoom for the Pentax K mount should I purchase for my K100D? I'd like it to go to 300mm, but if that compromises the IQ, then one that reaches to 200mm would have to work. I've even thought of using a Tak 300mm f/4 to cover that end.

What about these?

- Pentax FA 80-320mm (hard to find)
- Pentax FA-J 75-300mm
- Pentax DA 50-200mm
- Tamron 70-300mm LD Di Macro
- Sigma 70-300mm APO Macro
- and on a far strech, the much more expensive Sigma 135-400mm

08-01-2007, 05:07 PM   #2
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Don't count on an AF 300mm zoom to give you IQ of older manual lenses like the TAk 300 you mentioned..of course unless you spend hundreds.

Look into manual stuff first. Save your $$. :P
08-01-2007, 06:52 PM   #3
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Yeah the only thing is that with some of the subjects I shoot (namely railroads), AF is an asset. But then again the MF zoom I have is horrible. Maybe a high quality standard lens will be better?
08-01-2007, 07:04 PM   #4
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"Budget"-wise you have about 4 choices:

Sigma 70-300 APO
Pentax 50-200
Tamron 70-300
Used something or other...

I have the first 2 and think the Pentax has a bit better IQ, though less range and no close focusing like the Sigma or Tamron. Here is an informal comparison test of the Pentax and Sigma...
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/4768-lens-comp...-70-300-a.html

Had a $99 "ugly" Pentax 300 f4 from KEH that was very poor (red fringing and focus problems) and returned it...Sample...
http://i133.photobucket.com/albums/q78/KylePix/Tests/ugly.jpg

08-01-2007, 07:17 PM   #5
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SpecialK, you mean Budget Wise for AF?

The SMC-A 70-210/4 is a great lens. Someone also recommended the SMC-F70-210 f4-5.6. I tried it out today and I can comfirm its a great choice as well. Very sharp.

Some of the Series 1 Vivitars, RMC Tokina and Kiron telephotos are also great choices. Manual focus is kinda hard to accept/get used to but once you do, its very easy and offers alot more control and helps build your creativity.
08-01-2007, 07:42 PM   #6
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I forgot about the SMCP-F 70-210 f/4-5.6!

Tried out a used version at the local camera store, but it was... Then again, most of their Pentax stuff is the dregs.

I have thought about going with the combination of the DA 50-200mm f/4-5.6 and a SMC Takumar 300mm f/4.
08-01-2007, 07:59 PM   #7
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Well the SMC f 70-210 I tried had a stiff zoom ring and the store was dim so that certainly didn't help with handshake. But the few photos I managed to get where pretty good.

Look for the pump action SMC A version! Its bigger but is also very good.
08-01-2007, 09:30 PM   #8
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I like my Sigma 135-400mm, and have gotten several beautiful pic's with it.

However I also like my Old Sigma 75-300 APO (the 70-300's older brother) and have gotten several good pictures with it as well.

I probably use them both equally these days.

You really can't go wrong either way.

08-02-2007, 09:19 PM   #9
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[QUOTE=FotoPete;81586]SpecialK, you mean Budget Wise for AF?

[QUOTE]

That was the OP's question. I know you shoot manual.
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