[rawr]

Maybe someone needs to make a Speed Booster for Pentax 67 to 645

Then you could mount the smc PENTAX 67 105mm f2.4 and get ...

[2351HD]

Super happy with the 645z, selling a lot of my Canon gear, but I think I will miss f1.2 lenses, is there nothing f1.2 for this format?

Have you used the 90/2.8 macro? It offers very thin DOF and is very sharp. I am not sure I would want it to go wider.

[Digitalis]

Maybe someone needs to make a Speed Booster for Pentax 67 to 645

If anyone did, they would have a tough time recouping the development costs.

Except when you use it.

The Leica visioflex system was designed for 35X24mm frame size, the lenses won't be able to produce an imaging circle big enough to adequately cover a 33X44mm sensor. Also visioflex lenses are very old and tend to be rather hard to find - especially the 12.5cm f/2.5 which is a rare lens. You would be much better off getting a Leica S2 system with current state of the art designed for medium format lenses, rather than digging through the past for sub-par solutions.

[Lacunapratum]

If anyone did, they would have a tough time recouping the development costs.

The Leica visioflex system was designed for 35X24mm frame size, the lenses won't be able to produce an imaging circle big enough to adequately cover a 33X44mm sensor. Also visioflex lenses are very old and tend to be rather hard to find - especially the 12.5cm f/2.5 which is a rare lens. You would be much better off getting a Leica S2 system with current state of the art designed for medium format lenses, rather than digging through the past for sub-par solutions.

The system is called Visoflex and not "visioflex". Many of the lenses designed for that system are well known to cover medium format, including the 65mm, the Hektor, and the 200mm. In fact, these lenses cover the full 6x6 film format and even 6x7 https://www.flickr.com/photos/esquisses/4522415966/.

Especially the Hektor is easily adapted using the readily available M39 P645 adapters. The original poster just bought a P645Z - chances that he/she will swap systems are slim. The 12.5cm Hektor has wonderful bokeh and is ideally suited for portraits. It gets very sharp when stopped down and even at 2.5 it is very usable for portraits on the 645D or 645Z (I own both). In fact, chances are, that because of the sensor and image processing, the P645Z with the Hektor may be preferable to the Leica, even though their new 100 is likely to render clinically sharp images at full aperture. But that depends on the type of application you are going to use the lens for. If it was me, I'd rather use the Hektor with the P645Z, especially if I already own one. I can assure you, there is no light fall-off nor image degradation toward the edge of the frame, especially with the small 44x33 sensor. As I said, those lenses easily cover 6x7.

---------- Post added 11-01-14 at 10:45 AM ----------

The system is called Visoflex and not "visioflex". Many of the lenses designed for that system are well known to cover medium format, including the 65mm, the Hektor, and the 200mm. In fact, these lenses cover the full 6x6 film format and even 6x7 https://www.flickr.com/photos/esquisses/4522415966/.

Especially the Hektor is easily adapted using the readily available M39 P645 adapters. The original poster just bought a P645Z - chances that he/she will swap systems are slim. The 12.5cm Hektor has wonderful bokeh and is ideally suited for portraits. It gets very sharp when stopped down and even at 2.5 it is very usable for portraits on the 645D or 645Z (I own both). In fact, chances are, that because of the sensor and image processing, the P645Z with the Hektor may be preferable to the Leica, even though their new 100 is likely to render clinically sharp images at full aperture. But that depends on the type of application you are going to use the lens for. If it was me, I'd rather use the Hektor with the P645Z, especially if I already own one. I can assure you, there is no light fall-off nor image degradation toward the edge of the frame, especially with the small 44x33 sensor. As I said, those lenses easily cover 6x7.

I guess the other questions is whether you own any of these.

---------- Post added 11-01-14 at 10:48 AM ----------

... and I should also add that some of these Visoflex lenses are Mandler designs that were calculated and manufactured in the Midland Ontario plant. Some of the best lenses ever made. I used to own both a Midland and a Wetzlar copy, and I sold the Wetzlar copy. Rumors have it that all were manufactured at Leitz Midland, the Wetzlar ones were just relabeled. Anyway, these are marvelous lenses by all means.

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Last edited by Ash; 11-03-2014 at 03:40 PM.

[ndevlin]

The best you can do is adapt a Hassy FE 100mm f2. Fast enough for ya? The fact you'll probably never get it exactly in focus will make it an ideal portrait lens :-)

- N.

[LFLee]

.

The system is called Visoflex and not "visioflex". Many of the lenses designed for that system are well known to cover medium format, including the 65mm, the Hektor, and the 200mm. In fact, these lenses cover the full 6x6 film format and even 6x7 https://www.flickr.com/photos/esquisses/4522415966/.

...As I said, those lenses easily cover 6x7.[COLOR="Silver"]
and I should also add that some of these Visoflex lenses are Mandler designs that were calculated and manufactured in the Midland Ontario plant. Some of the best lenses ever made. I used to own both a Midland and a Wetzlar copy, and I sold the Wetzlar copy. Rumors have it that all were manufactured at Leitz Midland, the Wetzlar ones were just relabeled. Anyway, these are marvelous lenses by all means.

------

on the other hand, many said 'the DOF will be very thin if the lens is faster' for MF, but isn't that also depends on where you focus (how far your subject is), unless one comparing it at the lens minimum focusing distance?

[Lacunapratum]

Adapting the 110mm f2 Planar for the Hasselblad makes sense indeed. I have the same lens for the Rolleiflex and a 2.8/180mm Tele-Xenar, and both make for wonderful, dreamy portraits. Then there is the 12.5cm Schneider Goettingen Xenon which adds some really funky look, but I guess is only for those who are into those sorts of things.

I wish that Pentax would come up with a fast telephoto portrait lens, something like 2.0, instead of slowly updating their zoom range. I like the 28-45mm, but I am not sure about the other planned zooms. I'd like to see more primes, but I guess opinions vary, and Pentax likely knows the user base they are catering to. Having said that, I have really no complaints about the lens range as there is so much available. Best medium format system out there, IMHO. If anything was to improve it would be an electronic first curtain shutter and overall shutter robustness, but we had that discussion earlier.

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Last edited by Lacunapratum; 11-03-2014 at 08:37 PM.

[Ed Hurst]

I just wish there were a really fast wide angle prime (say a 28mm f2.8 or even f2.0) - very useful for star trail photography. Even with the 645Z's wonderful high ISO performance, I find f4 rather limiting on the 25mm and similarly f3.5 on the 35mm.

[Lacunapratum]

I can't see them do much in the 25/28mm category as they are already somewhat invested there, but how about an updated 35mm, e.g. 2.8. That would be useful for many application and would sell well, too, as it is the common 28mm full frame focal length. I'd guess it would be optically within their reach as well. I'd buy one any moment.

[Ed Hurst]

Sadly, I think you're probably right about the super wide range. And there don't seem to be any adaptable lenses made by anyone else with these properties either... :-(

[Digitalis]

that's because there isn't any money in it.

[Ed Hurst]

I have no doubt that that is true... There aren't enough people wanting to shoot the way I do...

[Victor Wolansky]

Have you used the 90/2.8 macro? It offers very thin DOF and is very sharp. I am not sure I would want it to go wider.

Yes I have, but would love something like then 24 1.4 from Canon or the 35 1.4 from Sigma which is a killer lens to be available for this camera.

With the better high ISO handling of these cameras today it is not a huge trouble to not have that, but it would be nice to have them, going low light and with a pretty fast lens, plus the quality of this sensor, would be a killer combination.

[AtitG]

I think they should make a portrait lens optimised for the current cropped 645 sensor, to keep the lens dimension smaller. maybe a "DA645" 110mm F1.8 or something. Unless they plan to release a "full frame" 645 soon.

[Digitalis]

but would love something like then 24 1.4 from Canon or the 35 1.4 from Sigma which is a killer lens to be available for this camera.

The DOF from a f/1.4 lens on a 33X44mm sensor would be microscopic.