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11-11-2020, 09:30 PM   #1
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Medium format F2.8 or brighter lens club

Found this medium format lens club the other day: Post your medium format f 2.8 Photos! (f 2.8 or wider ONLY!) - PentaxForums.com

Great motivation to shoot my Pentax 67 165 at F2.8. Now that the flare riddled aftermarket adapter has been flocked, the images look nice and contrasty. Next I'll shoot the 645 DFA 55 at F2.8 and post.

Hope others join in. Would love to see some super bokeh from fast medium format lenses. There is also a link to an article about 5 killer large aperture lenses.

Thanks,
barondla

11-12-2020, 04:26 AM   #2
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Great idea ! I have a few 67 lenses that would fit the bill (75 mm f/2.8 AL, 90 mm f/2.8, 105 mm f/2.4 and 165 mm f/2.8) and some 645 lenses too (45 mm f/2.8, 55 mm f/2.8, 75 mm f/2.8). I almost never shoot wide-open though. Is using wide apertures one of the criteria of this "New Club" ? I think only the 67 105 mm f/2.4 is impressive at wide apertures, all the others are at their worst.

Regards

Last edited by RICHARD L.; 11-12-2020 at 04:01 PM.
11-12-2020, 05:14 AM   #3
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QuoteOriginally posted by RICHARD L. Quote
Great idea ! I have a few 67 lenses that would fit the bill (75 mm f/2.8 AL, 90 mm f/2.8, 105 mm f/2.4 and 165 mm f/2.8) and some 645 lenses too (45 mm f/2.8, 55 mm f/2.8, 75 mm f/2.8). I almost never shoot wide-open though, is using wide apertures one of the criteria of this "New Club" ? I think only the 67 105 mm f/2.4 is impressive at wide apertures, all the others are at their worst.

Regards
Hi Richard. I am OP on this club, so will try to speak to your question about shooting apertures. The original intent of the club, in fact, was to show what P645 and P67 lens are capable of at f 2.8 or even wider, such as f 2.4 for the P67 105mm. On the other hand, since more broadly speaking the intent has to do with fast lens capabilities, in my view it would be quite legitimate to post photos of smaller aperture when the intent is comparison, i.e., comparing what one specific lens is capable of at f 2.8 vs f 8.0, or say to compare the performance of a particular lens at f 2.8 to demonstrate that it is better (or worse) than some other lens that is stopped down, or which does not open as wide as f 2.8. One might compare the P67 55/4 with the P67 75/2.8 at the largest aperture of both lenses, as another example. In other words, since the Club is concerned with fast medium format lenses with apertures of f 2.8 or better, just about any photo from any medium format lens would be appropriate within the context of a post that in some manner is concerned with fast medium format lenses. At some point, I will likely post photos from my fairly extensive Mamiya 645-C lens collection, and these I will have to present in a full-frame context since they re not adaptable to Pentax medium format cameras because of incompatible registry distances.

These are just my own musings, presented with not intent of being mandatory or even prescriptive, and you may well have other equally valid views. I do look forward to our exchanges. I have most of the P645 lenses, in AF and often non-AF versions, except for the 25mm and a few of the telephotos of greater than 400mm, and I am also lacking the two shortest zooms (28-45 and 33-55). I also have at least one version of all the P67 lenses except the 35/4.5 fisheye and some of the longest telephotos beyond 300mm.
11-12-2020, 05:49 AM   #4
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Hello Ivan,

Shooting an optic with the diaphragm wide-open is against my religion (just kidding) ! With 55 years of photo experience behind me, they call me the "f/11" guy ... lol ! I might try some wide-open photography to adhere to your club but this, against my better judgment ... Seriously, I'll have to dust my 67 M 105 mm f/2.4 as I consider it was the only decent medium-format optic that could be shot at wide apertures. This might be fun though.

Regards

11-12-2020, 07:00 AM - 2 Likes   #5
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f 2.8 with 645Z and Pentax 67 75mm f 2.8.

Here are a few shots wide open with a favorite lens, the Pentax 67 75mm f 2.8. These are mostly hand-held, SOC. This lens produces SOC images more than any other (except perhaps the 77mm in full-frame format).
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11-12-2020, 10:34 AM   #6
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QuoteOriginally posted by tuco Quote
Another but I don't shoot at that wide of aperture often at all.

Pentax 105/2.4


I like the wide apertures for subject isolation and subject emphasis particularly in my flower photography. Landscapists, of course, have little use for wide apertures as it is generally wished to create maximum sharpness across the photographed scene.
11-12-2020, 07:38 PM   #7
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Great images tuco. B&W looks fine with the wide open aperture. Please post them in the lens club link in my 1st post. Want to build up that club.

Thanks,
barondla
11-13-2020, 08:52 AM - 2 Likes   #8
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Ok, here is a picture of an ISCO Cinelux Xenon 115 mm converted for Pentax 645 mount. The aperture is fixed at 1.7. It is rather soft when focusing at infinity. However, for medium range it is very sharp with a pleasing bokeh.

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11-13-2020, 09:09 AM - 1 Like   #9
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QuoteOriginally posted by barondla Quote
Great images tuco. B&W looks fine with the wide open aperture. Please post them in the lens club link in my 1st post. Want to build up that club.
Thanks. Not wide open just f2.8
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