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05-20-2010, 07:02 PM   #1
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1:1 macro lenses

Hi,

Does Pentax makes (or has ever made) a 1:1 macro lens? Either K mount or m42?

Thanks,

05-20-2010, 07:09 PM   #2
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https://www.pentaxforums.com/lensreviews/SMC-Pentax-A-100mm-F2.8-Macro-Lens.html
05-20-2010, 07:16 PM   #3
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Pentax has made several.

Pentax DFA 100mm, Pentax DFA 50mm, Pentax A 50mm, Pentax A 100mm, Pentax A 200mm, Pentax FA 50mm, Pentax FA 100mm, Pentax FA 200mm, etc etc.
05-20-2010, 09:06 PM   #4
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QuoteOriginally posted by ismaelg Quote
or m42?
The original M42 Preset Takumar 50mm macro is 1:1 (the later Super & S-M-C M42 Takumars were only 1:2, for some reason).

05-20-2010, 09:24 PM   #5
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M42 Asahi Pentax Auto Bellows

I use a M42 Pentax Auto Bellows. I use it with enlarging lenses and can get well above 1:1.

If interested, you can read about it at this link - Inexpensive Macro Photography

The photo on the top was with an El Nikkor 105 on the bellows over the past few days. The second photo was taken with Fujinon 50 enlarging lens on a bellows. Both shots with hand held flash.




Last edited by stover98074; 05-23-2010 at 01:20 PM.
05-21-2010, 04:39 AM   #6
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I'm pretty sure the Pentax-A 50mm macro is only 1:2 magnification.

I've had a couple Macro-Takumar 1:1's and can recommend that lens.

Dave

on edit: there are a few Macro-Takumar 50:4's on ebay at the present time. They often sell for less than $100. The 1:1 version makes no mention of SMC or Coatings, and has two aperture rings at the front of the lens.

Last edited by newarts; 05-21-2010 at 05:22 AM.
05-21-2010, 01:53 PM   #7
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In addition the above, the DA35/2.8 is 1:1 macro.

PENTAX DA Limited Macro Lens for Digital SLRs and Compacts: smc PENTAX DA 35mm F2.8 Macro Limited
05-21-2010, 03:40 PM   #8
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QuoteOriginally posted by matoqui Quote
How close do you have to get with a 35 for macro!?

I'm curious, because there's obviously a good reason this configuration is available.

At first glance, it just seems like you would have to be incredibly close.

Is it the FOV/perspective that makes this a desirable FL for macro?

05-21-2010, 03:51 PM   #9
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That close.
05-21-2010, 05:03 PM   #10
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QuoteOriginally posted by Ira Quote
How close do you have to get with a 35 for macro!?

I'm curious, because there's obviously a good reason this configuration is available.

At first glance, it just seems like you would have to be incredibly close.

Is it the FOV/perspective that makes this a desirable FL for macro?
I think its not so much that 35mm is a desirable FL for macro, but rather how versatile the lens is itself. It poses as a roughly "normal" FL on APSC *AND* doubles as a 1:1 macro. The only other way to get close to that is with a 50mm macro on a FF
05-21-2010, 07:35 PM   #11
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A 35mm macro lens like the DA35 is not really meant to take pictures of insects or other small critters because the lens to subject distance at 1:1 magnification is too short for most animals (2.3cm, that's a bit less than 1"). The D FA 100 would be more appropriate for this purpose, with its comfortable lens to subject distance of 12.9cm at 1:1.

Macro lenses with short focal lengths like the DA35 are better suited for document reproduction and photography of small objects. It would require a huge studio to photography a painting with a 100mm lens, but it's possible to use a 35mm lens for that purpose in a normal sized room. As the DA35 has good field flatness, great resolution, low chromatic aberrations and almost no distortion when used at normal reproduction distances, it's a perfect repro lens.

Cheeers!

Abbazz
05-22-2010, 08:42 AM   #12
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I have yet to test my Macro-Takumar 50mm f/4 (which i understand is a 1:1) .... also have a set of M42 extension tubes as well ... which i might muck around with as well and see how close i can get.
05-22-2010, 09:18 AM   #13
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QuoteOriginally posted by Abbazz Quote
A 35mm macro lens like the DA35 is not really meant to take pictures of insects or other small critters because the lens to subject distance at 1:1 magnification is too short for most animals (2.3cm, that's a bit less than 1"). The D FA 100 would be more appropriate for this purpose, with its comfortable lens to subject distance of 12.9cm at 1:1.

Macro lenses with short focal lengths like the DA35 are better suited for document reproduction and photography of small objects. It would require a huge studio to photography a painting with a 100mm lens, but it's possible to use a 35mm lens for that purpose in a normal sized room. As the DA35 has good field flatness, great resolution, low chromatic aberrations and almost no distortion when used at normal reproduction distances, it's a perfect repro lens.

Cheeers!

Abbazz

Insect Macro images with the DA 35mm ltd. It is more hand holdable than tele macro lenses.



05-22-2010, 12:50 PM   #14
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QuoteOriginally posted by newarts Quote
I'm pretty sure the Pentax-A 50mm macro is only 1:2 magnification.
Dave, that's true. The A 50 needs an extension tube to reach 1:1 - I just confirmed that on my copy.

Ben
05-22-2010, 05:22 PM   #15
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QuoteOriginally posted by raymeedc Quote
The original M42 Preset Takumar 50mm macro is 1:1 (the later Super & S-M-C M42 Takumars were only 1:2, for some reason).
The reason is the change from a preset aperture design. When they included the aperture actuating bits-n-pieces it ate up quite a bit of space that the previous design had been able to use for extension.
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