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06-16-2009, 01:18 AM   #1
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Macro lens for pentax

Hi,
Would you recommend this lens for macro shots?
Does it fit the K100D ?

PentaxWebstore smc Pentax DA 55-300mm f/4-5.8 ED

Or maybe the Sigma (Sigma | 70-300mm f/4-5.6 DG Macro Autofocus Lens | 509109 | B&H) should do the job ?

06-16-2009, 01:48 AM   #2
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I'd say no to both. DA 55-300mm isn't even the pseudo-macro lens that the Sigma is, and the Sigma... well, it'll let you get "close" to a subject, but is not a true macro lens.


Think of the "macro" capability of it as a bonus to the telephoto zoom, which is what it is primarily. If you want to be serious about macro, you have to get a macro lens.


Good thing about macro is that you rarely, if ever, need AF, so you could purchase any one of the great manual focus macro lenses for cheap, e.g., 50/4 or 105/4 macro Takumars, Tamron SP 90/2.5, Vivitar/Kiron 105/2.5, Volna-9 50/2.8, etc.
06-16-2009, 02:07 AM   #3
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With few exceptions macro on telezooms are a fake that only reach 1:4, maybe 1:3.

Pentax currently makes three excellent macro primes: DA35/2.8 ltd macro 1:1, DFA50/2.8 macro 1:1, DFA100/2.8 macro 1:1. I'm using both the 35 and the 100 for both technical shots and some bugs and flowers for recreation. They are both excellent lenses that double as a good normal and a good portrait prime respectively. The 50 is suposedly also a great lens.
As Rawhead says, you have limited use for AF in macro, so going for a MF macro prime is a cost effective option. Any of the Pentax or Takumar 50 or 100mm macro 1:2 or 1:1 lenses. A cheap option is the Tamron Adaptal II SP 90mm f2.5 1:2 macro which can be used with both a dedicated 2x converter or a tube to get 1:1 macro. You can find macro shots with both the 35lt, the DFA100 and the SP 90/2.5 on my humble blogg.
06-16-2009, 03:19 AM   #4
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100mm for eaxample doesn't limit my options for the distance of the object?
MF is supported by the K100D ?

06-16-2009, 03:54 AM   #5
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QuoteOriginally posted by menta Quote
100mm for eaxample doesn't limit my options for the distance of the object?
MF is supported by the K100D ?
I'm not sure what you mean by "limit my options for the distance to the object" all macro lenses do that to a greater to lesser degree. If by the above you mean "can I set up a bit farther away as to not scare skittish insects and the like" Then I can give a qualified "yes". The longer the focal length of the macro lens the further back you can be. I have to agree with the above posters in that to achieve "true" macro you need a macro lens. There are several alternative methods of trying out macro photography w/o buying a macro lens. You can get a "reversing ring" which allows you to mount a lens backwards. This will give you quite close focus. I've never tried this method and don't know much about it. The other popular method is to get an extension tube, which is essentially a tube that extends your lens further away allowing close focus.
BTW, macro lenses work quite well for 'normal' photography. I use my Tamron 90mm macro as a short tele and for outside portraits.

edit: to answer your second question, yes the K100D supports manual focus lenses

NaCl(hope that helps)H2O
06-16-2009, 03:54 AM   #6
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For the DA 55-300mm to do decent macro you want a Raynox DCR 250 macro diopter with it, then it goes extreme macro with the xooming in and out affecting the degree of magnification.
A sample pic with the diopter attached.

and another sample pic
06-16-2009, 04:14 AM   #7
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I think i'm going on this one
Pentax | smc P-D FA 100mm f/2.8 Macro Autofocus Lens | 21520

Can I be sure it will fit my K100D ?
06-16-2009, 04:34 AM   #8
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Yes it will fit your K100D

06-16-2009, 05:25 AM   #9
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QuoteOriginally posted by menta Quote
I think i'm going on this one
Pentax | smc P-D FA 100mm f/2.8 Macro Autofocus Lens | 21520

Can I be sure it will fit my K100D ?
It will fit. These are shot with that very lens.




06-16-2009, 05:44 AM   #10
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Menta, the DFA 100/2.8 is a very capable macro lens. You won't be disappointed, but be sure to stop down proportionately to how close you are to your subject!

And if you see "Pentax" on ANY lens, you can be assured that it will fit your camera. AND, any K-mount lens made by Sigma, Tamron, or any other company will also fit fine too.
06-16-2009, 06:47 AM   #11
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for what it's worth.. i picked up the pentax fa 100mm f3.5 lens, in pretty good shape, for about 100 bucks (u.s.)... it's a noisy little bugger, and focus can be sometimes a wee bit tricky... but i've had some success.... take a look.. recent pf posting...
https://www.pentaxforums.com/forums/post-your-photos/63412-saying-my-prayers.html
i also bought the 1:1 screw on lens from wolfe camera.... pretty good..
06-16-2009, 07:49 AM   #12
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i got the macro-takumar 50mm f/4 preset for ~$45. its 1:1. nothing spectacular about this shot except that its 1:1. still getting used to it.

06-16-2009, 08:21 AM   #13
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The Tamron and Sigma versions of the 70-300mm will give you 1:2 macro at 70mm. I've seen some very good images taken with the Tamron by hinman.

http://techtheman.blogspot.com/2008/04/tamron-70-300-di-ld-macro-test-shots.html
06-16-2009, 09:38 AM   #14
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SMC-P M 100mm f/4

This shot was taken with my trusty M100 "Dental" macro. The dental just has a few more scales engraved on the lens barrel.

06-17-2009, 01:49 PM   #15
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QuoteOriginally posted by menta Quote
Can I be sure it will fit my K100D ?
Anything that says "Pentax" and either F, FA, or DA anywhere in the name will fit and work perfectly. Other lenses that say Pentax may fit, but won't necessarily have autofocus or autoexposure, or might require an adapter.
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