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12-19-2011, 06:05 PM   #1
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K-r & 40mm & 70mm dilemma

ive been gone for a while but am back and have some pics and questions....about a year ago I asked the forum folks to help me decide on a new lens: after much deliberation i go the Pentax DA 40mm Ltd. 2.8. I have been very pleased with it and use in as my everyday walkaround lens


the only drawback i really saw was i wanted more length for my portrait shots....soo i bought a sigma 70mm 2.8 macro lens recently and while i havent had the chance to take a lot of shots with it, the shots i have taken i have loved and find it to be an excellent glass. i love the sharpness and colors of the lens and it really brings out the subject...a heavy lens for sure but fun too.

now im looking for something to fit the need of landscape/ wide angle shots...group shots tend to be difficult and the 70 requires me to be a mile away and the 40 still needs some distance...i was thinking of something in the 12 - 28mm range but cant decide if its worth another lens at this point. i still have the 18-55 pentax kit lens which i hear is a good fit for this purpose...

my real dilemma is considering returning the 70mm sigma.....considering i love my 40 and while not as long, i feel i use it for the same purpose...portraits....granted i will have to walk closer to the subject in order to achieve the same look and feel of the 70mm with the 40mm but i think they are similar in use/intention (am i wrong ?)

second- if i do return the sigma 70mm then what would be good options for wide angles ? i love primes and am nervous about getting a zoom but the versatility would be a huge convenience especially if i can find IQ and sharpness bokeh close to that of a wide prime.

i appreciate the input and promise to be a better updater than i have been in the past ! = ) thanks everyone!

12-19-2011, 06:09 PM   #2
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Sounds like you might need a zoom- maybe return the 70mm macro and get a 24-70mm zoom?

Sigma 24-70mm f/2.8 IF EX DG HSM Autofocus Lens for Pentax B&H

There's current a $50 discount on it.

For portraits, have you considered the Sigma 85mm F1.4?

Sigma 85mm F1.4 HSM - Review- PentaxForums.com

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12-19-2011, 06:13 PM   #3
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QuoteOriginally posted by enjoytheride Quote
70 requires me to be a mile away and the 40 still needs some distance...i was thinking of something in the 12 - 28mm range but cant decide if its worth another lens at this point. i still have the 18-55 pentax kit lens which i hear is a good fit for this purpose...
The 12-24 is a very useful range and has excellent IQ.

QuoteQuote:
my real dilemma is considering returning the 70mm sigma.....considering i love my 40 and while not as long, i feel i use it for the same purpose...portraits....granted i will have to walk closer to the subject in order to achieve the same look and feel of the 70mm with the 40mm but i think they are similar in use/intention (am i wrong ?)
Well, yes, you are wrong :-) The perspective of being closer to the subject makes the nose larger and ears smaller, and you will have a harder time blurring the background. There is a reason the 70 is used for head-and-shoulders portraits.
12-19-2011, 06:41 PM   #4
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thanks for the quick responses...SpecialK, indulge my ignorance please for a moment...i understand what you are saying regarding the 70mm's purpose.......what would be the 40's ideal purpose/setting for use ? is it not a good lens for portraits ? given head and shoulders are the 70's forte, but 3/4 length for the 40?

Adam, thanks for your help.....how would sharpness/color/bokeh/ over all IQ on the sigma 24-70mm f/2.8 compare to the 70mm f2.8 ?

thanks fellow pentaxians!

12-20-2011, 10:42 AM   #5
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Figure generally with APS-C that 28-40mm is for group and full-body shots; 50-58mm is for half-body and torso shots; 70-90mm is for near headshots; 135-150mm is for further headshots and partial facials. For fairly formal portraiture, ie not snapshots nor squirmin' vermin (hyperactive kids), my favorite people lens is an old M42 Sears-Tokina 55-135/3.5. Are many different ways to portray people and other creatures, and many different tools to do so.
12-20-2011, 11:04 AM   #6
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QuoteOriginally posted by enjoytheride Quote
thanks for the quick responses...SpecialK, indulge my ignorance please for a moment...i understand what you are saying regarding the 70mm's purpose.......what would be the 40's ideal purpose/setting for use ? is it not a good lens for portraits ? given head and shoulders are the 70's forte, but 3/4 length for the 40?

Adam, thanks for your help.....how would sharpness/color/bokeh/ over all IQ on the sigma 24-70mm f/2.8 compare to the 70mm f2.8 ?

thanks fellow pentaxians!
I don't have the most current 24-70 i have an older one, it is an excellent (though large and heavy) lens. I don't hink it beats a good prime but it produces good images. Quick search for different lengths wide open

24mm @ 2.8




53mm @ 2.8





70mm @ 2.8





12-20-2011, 11:13 PM   #7
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Personally I would not sell the 70; it's a very useful length for portraits (as explained) but also if you want to zoom in a little and for macro.

I'm still looking for a wide angle as well to complement my kit.

I'm not a strong believer in UWA lenses for landscape; I find in general the 18mm of the kit lens more than sufficient (which is basically just wide on APSc). I however usually shoot nature/landscapes with the FA31Ltd. For architecture (inside churches etc), I want the option of something wider than 18mm. My contenders are the DA12-24 and the Sigma 10-20 and haven't made up my mind yet and there is no rush for me.
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