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Old Apr 14, 2008, 11:07 PM   #1
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Hello, I have already the Sigma 70-300mm APO DG and the Tamron SP AF90mm F/2.8 (Di) Macro for my Pentax K100D.
I may be able to buy some of these 2nd hand lenses, so I wonder if they are worth while, considering what I have, and would they work with my K100D.

SIGMA/PENTAX MF 70-210 F4-5.6 'W' $66
OSAWA/PENTAX MF 24MM f2.8 c/w caps 'G' $28
VIVITAR/PENTAX K 70-210mmf4.5 LENS 'W' $33
PENTAX SMC 28-70MM F4 AL LENS 'VG' $110
and also
SIGMA/PENTAX EF-430ST FLASH 'G' $44

I would very much appreciate your opinions,
Rodney.
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Old Apr 15, 2008, 5:28 AM   #2
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Rodney9 wrote:
Quote:
Hello, I have already the Sigma 70-300mm APO DG and the Tamron SP AF90mm F/2.8 (Di) Macro for my Pentax K100D.
I may be able to buy some of these 2nd hand lenses, so I wonder if they are worth while, considering what I have, and would they work with my K100D.

SIGMA/PENTAX MF 70-210 F4-5.6 'W' $66
OSAWA/PENTAX MF 24MM f2.8 c/w caps 'G' $28
VIVITAR/PENTAX K 70-210mmf4.5 LENS 'W' $33
PENTAX SMC 28-70MM F4 AL LENS 'VG' $110
and also
SIGMA/PENTAX EF-430ST FLASH 'G' $44

I would very much appreciate your opinions,
Rodney.
Hi Rodney,
I can't say I've experience of any of the lenses, the flash trigger voltage for an EF430 is given the OK here ...

http://www.botzilla.com/photo/strobeVolts.html

Are the prices US dollars or AUS dollars ?. ... Jack
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Old Apr 15, 2008, 6:36 AM   #3
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Hi Rodney,

I don't have any experience with any of the lenses nor the flash, but I've gotten pretty good at guessing from the sometimes sparse info that's out there.

The only lens that I can comment on is the Pentax 28-70 f4. If this is the FA 28-70 f4 AL, then it's auto focus, and is rated (!) in the SPLOSdb. This would be enough for me as a recommendation. There aren't too many lenses that rate this highly, and most are probably * class lenses. From testimonials I've read, a number of users prefer this lens over the 3rd party 28-70/75 f2.8 lenses for it's smaller size and IQ despite the fact that it's a full stop slower wide open. The FL range is very good for shooting people, IMO, giving you a little more working distance than the 1.5x crop equivalent (18-50 or so). I have an 28-75 f2.8 Tamron that does well for this, and is a good walk around lens as well.

The Sigma flash is apparently either TTL or manual, with no other exposure automation available. You can probably get a pretty high end used N, C, Pentax, or name brand non dedicated flash with an Auto Thyristor mode for the same money or less.

Hope this might help a little.

Scott

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Old Apr 15, 2008, 10:46 AM   #4
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To compliment what you already have I'd recommend the 28-70. You have all the others covered! I've found the 28-70 range very useful!

Dawg

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Old Apr 15, 2008, 12:07 PM   #5
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The 28-70mm is an "okay" lens. I'd be more inclined to pick up a Pentax-A or Pentax-F 35-70mm instead. The only other lens I would consider would be the Vivitar 70-210, but only if it's a Series 1 lens. If not, I'd pass on that one too....
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Old Apr 15, 2008, 3:28 PM   #6
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Like you, I have the Sigma 70-300 APO DG. IMO, the quality of this lens is beyond compare in this price range. Hence, I wouldn't bother with either of the 70-210 lenses.

I don't have any experience withthe other focal length lenses you mentioned.
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Old Apr 15, 2008, 6:08 PM   #7
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I agree with Scott and Dawg. The 28-70 expands your range of coverage, and would be the most useful without duplicating what you already have. It gives you complete coverage from 28-300mm, and is more flexible than the fixed focal length 24mm would be.
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