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12-09-2009, 10:48 PM   #1
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Technical Data for the new Weather Resistant Pentax DFA 100mm F2.8 Macro

We've now added the new Weather-Resistant Pentax DFA 100mm F2.8 Macro to our Lens Review Database:
Pentax Lens Review and Specification Database - 100mm F2.8 Macro WR

Along with a photo of the lens, we also have compiled the following technical specifications:
Weight Diam x Length Filter Diameter Min. Focus Max. Magnification
340 g 65 x 80.5 mm 49 mm 30 cm 1x
Diagonal FOV (APS-C) Horizontal FOV (APS-C) Hood Min. Aperture Max. Aperture
16 degrees 14 degrees PH-RBE 49mm f/32 f/2.8
Diagonal FOV (24x36) Horizontal FOV (24x36) Case Optical Construction 
24 degrees 20 degrees S80-120 9 elements, 8 groups, 8 blades 

See this thread for more speculation and discussion: https://www.pentaxforums.com/forums/pentax-news-rumors/81836-new-pentax-d-fa-...announced.html
And this thread for the official release announcement: https://www.pentaxforums.com/forums/official-pentax-news/82816-pentax-adds-10...s-line-up.html


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12-10-2009, 04:30 PM   #2
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Wow with weather-seals and metal frame, it's even lighter than the non-WR which is 12.2 oz. (345g) made of plastic based on the Pentaximaging website.
12-10-2009, 06:31 PM   #3
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It probably lost some weight when it lost the aperture ring
12-11-2009, 10:19 AM   #4
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I saw some posts in the Canikon camp that their equivalent macro lenses are way too big in comparison. Maybe we'll get some defections ;-)

12-11-2009, 11:20 AM   #5
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QuoteOriginally posted by kenyee Quote
I saw some posts in the Canikon camp that their equivalent macro lenses are way too big in comparison. Maybe we'll get some defections ;-)
not because of macro that's for certain. for macro shooters one of the best dedicated macro lenses around is the Canon MP-E 65mm. By it self it is reason to keep a Canon body & flashes around.

As for the new Canon EF 100/2.8L Macro it's not that much more ex*****ve than the new Pentax MSRP wise.
12-11-2009, 12:33 PM   #6
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QuoteOriginally posted by brecklundin Quote
not because of macro that's for certain. for macro shooters one of the best dedicated macro lenses around is the Canon MP-E 65mm. By it self it is reason to keep a Canon body & flashes around.

As for the new Canon EF 100/2.8L Macro it's not that much more ex*****ve than the new Pentax MSRP wise.

I dunno. a $200 difference seems to be a huge gap. besides, I'm not that quite impressed with the Canon 100 L lens results that I'm seeing. anyway, I would love if the new WR 100mm would be priced around at 600 bucks. at $850, I would rather have an FA77 + diopter for macro use.
12-11-2009, 01:23 PM   #7
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QuoteOriginally posted by Pentaxor Quote
I dunno. a $200 difference seems to be a huge gap. besides, I'm not that quite impressed with the Canon 100 L lens results that I'm seeing. anyway, I would love if the new WR 100mm would be priced around at 600 bucks. at $850, I would rather have an FA77 + diopter for macro use.
200-bones is not a lot if you are talking switching brands just to spend $200 less on a given lens. Right? I mean it does have USM, IS, 9-blades and is sealed as well. Plus it will come down in price soon enough, not a lot be some because right now it is pretty much at MSRP everywhere as I recall anyway.

And yeah, the Pentax has to drop in price as well, no way it's worth the premium over existing options. Lack of a silent focus system is a big miss in my opinion. Macro often needs near silent operation to get the shot.

Honestly, I haven't seen any shots from the 100/2.8L yet so I dunno...but I was trying to say, in my own slip shod fashion, that the Pentax 100/2.8 WR is not reason enough to switch from Canon when a similar lens is out and not that much more expensive and also has USM IS (4-stop new hybrid design as I recall) in a macro.

I am with you I don't see the Pentax lense being worth more than $600 and even then, I probably would opt for a Sigma 150mm or even another 180mm but these days my hands are liking the lighter gear. In reality I will opt for another 35ltd before buying any other lenses. And yeah, I would take a 77ltd over a 100mm macro anyday...wait, I already did that! hehehehe....

BTW, the MP-E 65mm is really a bargain for macro shooters. While it has the limitation of being macro only, it is a 1x-5x macro so it eliminates a ton of extra crap to get more than 1:1. Because I enjoy macro I think it's one of the best value lenses Canon offers, it just has a limited use so ya gotta really like macro.

I am on the fence about the new Pentax. I don't see it as a fit for me but others might. I will wait until we see the actual shipping version. I find it difficult to imagine there is no focus limiter switch and the distance scale is open and uncovered.

Still I bet is gonna have super IQ...
12-11-2009, 04:02 PM   #8
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More accurately...

Min focusing distance is 0.303m (0.99 ft.)
Working distance is 0.130m
FOV is 24.5 (with 35mm Film SLR body)

12-11-2009, 04:07 PM   #9
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QuoteOriginally posted by brecklundin Quote

Still I bet is gonna have super IQ...
hopefully, otherwise my FA100 would do at that focal length. but now it seems that it's getting replaced by my Sigma 70 for frequency of use for telephotos and macro. so I'm not too interested with the new WR lens as of this moment. 150mm-200mm would had been much better, IMO. but that would push the price up to a 1,000 bucks I believe.
12-12-2009, 06:53 AM   #10
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Not interested at all. Already have the Pentax DFA100 macro. It hardly gets used after buying the A*200 macro. Thats what they should have built.

With all the gaps in our lens system why are they redesigning perfectly good lenses? Their lens plans lack a plan. We really needed a 31,32,35,40,and 43? New macro won't even work on film camera and doesn't have aperture ring. No thanks. Should have at least made it a 135mm.
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12-12-2009, 08:35 AM   #11
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They might as well call it a DA without an aperture ring =P Unless Pentax is planning to announce a new FF after this lens' release next year, in which DFA is no longer the term for film and digital, but in fact for full frame and APS-C.
12-12-2009, 09:11 AM   #12
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'Course, if the CN crowd want to use this lens, they can just go ahead and buy the Tokina version.

Which probably explains why it's still a full-frame lens.
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