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08-18-2008, 01:53 PM   #1
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Pentax D FA 50mm or 100mm.

I would like to buy a Pentax macro lens and wonder which of these two would be best for my K10D.

The D FA 50mm 2.8 or the D FA 100mm 2.8?

The 50mm seems to focus a littler closer according to the specs and has a closer working range, it is also $100 cheaper at my local camera store than the 100mm.

Are they the same in quality? What would the 100mm offer over the 50mm? They both seem to be 1x life size.

Thanks

08-18-2008, 02:40 PM   #2
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Again, this is all about what you shoot most of the time and what focal length you really prefer.

50mm macro is great for copy works, still life photography and casual shoot around the house. Its images have perspectives easy on the eyes. No problems with sharpness and contrast is incredibly high. It is usable wide open at f2.8

100mm macro would definitely give you a little more reach and it is light, non-threatening to pedestrians if you use it in the streets. For insects, it is a tad short for in-flight shots. The sharpness is lacking until f4.5 and its autofocus is sluggish under not-so-ideal lighting. I found under-exposed bokeh a problem for most of the time.

Look into your port folio and see what focal length you use all of the time. If you never shoot 1:1 macro, whare are your intended subject with the new macro you are going to get. Then the answer might be more clear.
08-18-2008, 03:33 PM   #3
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Thanks roentarre.

I find my 50mm 1.4 to be my favourite lens. The 100mm will give me a different lens.

For shooting I am in cottage country, lots of butterflys, dragon flies, bettles, spiders, bees, caterpillars, moths, mantis etc.

I have read that you lose depth of field with a macro, so you should shoot more at f22 than f2.8 to get the detail.

On the other hand, I collect military buttons and badges - more on the still life side of things.

I guess this would all lean towards the 50mm then.
08-18-2008, 03:55 PM   #4
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As alternative I would suggest the Sigma 105. It is priced between the two Pentax macros you list. I find the D FA 50 an outstanding lens, but for 'bug shot' the 105 gives a little more working room...........there have also been highly complimentary reports on thr Tamron 90mm.

08-18-2008, 04:34 PM   #5
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QuoteOriginally posted by tubadad Quote
I would like to buy a Pentax macro lens and wonder which of these two would be best for my K10D.

The D FA 50mm 2.8 or the D FA 100mm 2.8?

The 50mm seems to focus a littler closer according to the specs and has a closer working range, it is also $100 cheaper at my local camera store than the 100mm.

Are they the same in quality? What would the 100mm offer over the 50mm? They both seem to be 1x life size.

Thanks
I like 100 mm or longer macros because you get extra distance to the subject for the same magnification. Just my own personal preference
08-18-2008, 05:34 PM   #6
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Bugs? 100mm

Things that don't get scared easily? 50mm

I have a Tamron 90mm that is excellent. Almost use it exclusively now instead of my 50mm.
08-18-2008, 05:45 PM   #7
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QuoteOriginally posted by innershell Quote
Bugs? 100mm

Things that don't get scared easily? 50mm

I have a Tamron 90mm that is excellent. Almost use it exclusively now instead of my 50mm.
Nicely put. And it made me realize, as Lowell says, that while the 50mm will focus at a closer distance than the 100mm, this doesn't really matter does it. Because they will both give 1x life size.
08-18-2008, 06:16 PM   #8
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50 or 100 macro?

tubadad,
I have enjoyed my 100mm macro for almost a year now. I shoot alot of close-ups with it and it took a bit of understanding macro photog, then the results were acceptable to me. I usually use a tripod, set the camera to manual mode and manual focus, then set the self timer on 2 sec. This has worked for me. I posted a desert cactus shot in the gallery if your interested. Good luck.

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