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04-24-2020, 04:33 PM   #61
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QuoteOriginally posted by andrewdoak Quote
Hi all, first time poster. I'm having difficulty finding what I need, so I am coming to the experts.

"Using Aperture Ring" appears to be a setting on other Pentax DSLRs when using manual lenses, but I do not have that option on my 645D. I'm having a difficult time finding documentation by Pentax or anyone else on the subject. I have a lens mount adapter for M39 lenses to my 645D. I have M39 lenses. I know there must be a few settings in the Menu I need to adjust, and all the videos I have found (here and other places) reference the Using Aperture Ring setting. My 645D doesn't have that as a setting option. Does anyone have any advice/guidance? I've searched this forum for my exact issue and have yet to find it (if it exists, I apologize in advance).

I think I'm in the right thread. Thank you for the help.

I don't have a "D" and expect some of those owners may see your message soon. I will note that recent experiments with reversed lenses on my "Z" where no aperture-status mechanical or electrical coupling to the camera existed showed that I could set the lens aperture at the lens and choose "Av" as a control setting to produce reasonably exposed images. I expect "TAv" would have also worked. I didn't try all possible configurations as the point of the experiment was to see what magnification resulted from using the Pentax 645 reverse lens accessory and attachment.

04-24-2020, 08:59 PM   #62
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Thank you @kaseki I'll test some additional configurations with better natural light. I'm just frustrated with the settings in the 645D... I was hoping for some "fun" glass in an otherwise excellent kit.
04-25-2020, 12:49 AM - 1 Like   #63
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I haven't explored what the K-5 aperture ring menu setting actually does other than allow the camera to be used with the aperture ring off 'A'. This is presumably there to prevent new owners from having problems (duff shots) when using lenses off A and blaming the camera/lens.

The only non-native lenses the 645D officially supports (ie without A settings) are the 6x7 lenses on the Pentax adapter (I have yet to try a 645 lens off A). These provide open aperture metering and auto diaphragm in M & Av (the camera automatically drops out of Program if it's selected). Pentax may not have seen the need for the menu setting on the D or Z.

I would expect that M (Av too perhaps) would work with any lens with stop down metering using the - focus wide open, stop-down, meter, shoot routine. The only likely problem being any electrical contact with the adapter - I've heard reports that some non-Pentax 6x7 adapters need paint scrapping off part of the adapter or one or more of the electronic pins on the body covered with insulation tape to get the D or Z to work.

Last edited by johnha; 04-27-2020 at 04:33 AM. Reason: Clarified the first and last sentences
04-25-2020, 03:31 AM - 1 Like   #64
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I have a 645D, and all I need to do with Pentax lenses is push the lock button on the lens and rotate the aperture ring. That puts the camera out of the Command Dial mode for aperture control and puts it into Aperture Ring control. Rather nice compared to having to fumble in menus to do this.

Now, I don't have any 3rd party lenses to know for sure how that part goes, but I expect it needs stop-down operation. This is where you open the aperture all the way up for focusing, then manually stop it back down for metering and shooting. I have run crossed-up lenses on other bodies, most notably Nikon manual focus on Canon bodies (the 1Ds when it was new, for example) and stop-down was the way to go.

Manual or Aperture Value shooting modes are what I would expect to work here.

Stan - New to Pentax and the 645D, but not new to cross-system shooting

Edit: I might go for one of those 200mm f2.8 Carl Zeiss Jena lenses from the Pentacon Six. There's another thread showing lenses in the 200mm range and I rather like the look of that Sonnar. That is most likely my first 3rd party adapted lens. So, I guess I am also looking for confirmation on how to shoot with this on a 645D.

Last edited by wa2kqy; 04-25-2020 at 05:09 AM.
04-26-2020, 08:19 AM   #65
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Thank you @johna and @wa2kqy I will work with your suggestions and share what I get. Much appreciated.
04-27-2020, 05:02 AM   #66
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Shooting the D (and presumably Z) with P6x7 lenses* on the Pentax adapter is completely seamless. You get open-aperture metering and auto-diaphragm operation in M, Av (and probably TAv). The camera automatically drops down from Program to Av, from Matrix to centre-weighted - the AF settings don't get in the way and AF confirmation still works. It's not like some cameras where you need to set various 'basic' settings to avoid getting an error flashing on the LCD or have to get an 'AF confirm' adapter. If you keep the P67 adapter on the back of the lens, it's just like changing lenses - put a 645 (D)FA lens back on and all your settings remain the same.

I presume most of the above also work for non-Pentax adaptations (open-aperture metering and auto-diaphragm are likely to be lost first). If the lens has a stop-down lever (like the M42 Taks or P6x7 lenses) or is a preset, this simplifies things - otherwise you'll need to open/close the aperture manually using the aperture ring (assuming the adapter allows this).

Update: * those P6x7 lenses with automatic diaphragms (i.e. not some of the longer teles or the 75mm shift).
04-27-2020, 05:08 AM   #67

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Will leaf shutter lenses non-native to 645 mount work? Either those for Hasselblad or P67?
04-27-2020, 07:28 AM   #68
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QuoteOriginally posted by BarneyL Quote
Will leaf shutter lenses non-native to 645 mount work? Either those for Hasselblad or P67?
The P67 90mm f/2.8 L/S seems to work with the Pentax adapter using a shutter speed of 1/8th (the leaf shutter on this lens is triggered by the aperture stop-down lever). The P67 165/4 leaf shutter seems to operate differently and may not work (there was a thread about this sometime ago).

Update: Bit of digging:

Last edited by johnha; 04-27-2020 at 07:35 AM.
04-27-2020, 09:43 AM   #69
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Third-party lenses on adapters work with stop-down metering. Use the lens’s mechanical switch to move it into manual-aperture mode (most such adapted lenses from the Second World or from vintage times are either manual aperture only, have such a switch, or use a preset ring). Then, the camera will work on Av (aperture-priority automatic exposure), TAv, and M. You’ll have to stop down to taking aperture manually after focusing.

You do not have to do any of this with Pentax lenses.

By the way, which M39 lenses do you expect to work? M39 is both a screw mount for enlarger lenses and also the mount for Leica screw-mount cameras. Lenses for the latter can’t get close enough to the sensor on a 645D to focus at infinity. Enlarger lenses of longer focal lengths might, but you’ll have to mount them on a focuser like a bellows.

Rick “who routinely uses Pentacon-Six-mount lenses on a 645z with stop-down metering” Denney
04-27-2020, 08:45 PM   #70
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Hey Rick, I have a "pancake" Russian 2.8/28 and a Super Wide-Heliar 15mm screw-mount. I'm having difficulty with the focus, but I'm still playing with suggestions from the group. Thanks for the additional suggestions. Again, I'm still trying to get them to work. I have plenty of "actual" Pentax lenses, I just liked the idea of using older glass in a more modern body. It could be a wasted effort on my part, but I would love to get a few settings that give me some "dreamy" images. I will share results when I get some "decent" images (if that is possible).
04-27-2020, 10:03 PM - 1 Like   #71
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Those lenses won’t focus to infinity on the 645, sorry to say. Even if they did, they would not cover the format and (especially with the 15) you’d have a round image in the middle of the frame.

I have a Fed 3 and a Fed 5—the cameras that Russian 28 in Leica Thread Mount was made for. My widest for those cameras, though, is the Jupiter 35, but that lens extends back nearly all the way to the film. It could never be used with an SLR.

And I was tempted by the Cosina back in the day, primarily to get that Heliar, but never pulled the trigger. Fun lens on a fun camera.

You could do some pretty extreme macro, though.

Rick “about 30 mm too far from the film on a P645” Denney
04-30-2020, 09:24 AM   #72
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Thanks Rick. Much appreciated. Maco testing it is, then.
08-28-2020, 05:54 PM - 1 Like   #73
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Fotodiox does make a Visoflex to p645 adapter now.

L39 Leica Visoflex Lens to Pentax 645 Mount Cameras - Pro Lens Adapter ? Fotodiox, Inc. USA
09-29-2020, 06:41 AM   #74
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QuoteOriginally posted by veraikon Quote
Pentax Medium Format Resources: Pentax 645: Third party lenses via adapter

Adapting “third party lenses” is in medium format (MF) photography more usual than in 135 photography. The main reason is IMHO the fact that MF photography with interchangeable lenses never was mainstream photography and always a small market. Unlike for 135 systems for most MF systems on economical reasons there are only one manufacturer (mostly the camera manufacturer) who offers lenses for “his” MF system. With a limited number of customers an economical production of special lenses is often not possible. So these lenses are expensive or not will not be built.
From this economical fact comes the necessary reason to adapt “rare” and special third party lenses (or other resources) from a third party manufacturer to the own system.
So MF systems are more open than 135 camera systems. Some MF camera manufactures (e.g. Hasselblad, Pentacon …) offers blind mount for adaptions, some manufactures (e.g. Pentax, Mamiya, Contax or future Leica) have/had adapters for thirds party lenses in their MF portfolio.
Another reason is that MF photography is a “slower” photography than 135 photography. Most adapted MF lens have some restrictions or limitations (no automatic aperture, no electronically communication with the camera). In the “faster”135 photography this may be a major disadvantage, in more contemplative MF photography stop down metering would not be too uncomfortable.


Pentax 645 cameras have a flange distance (FD) of 70.87 mm. That means from lens mount to film/sensor is a distance of 70.87mm.
Mechanical you can adapt every lens which has
_ a FD higher than 70.87mm
_ a mount diameter which would fit.
_ a image circle which illuminates at least 60mmx45mm

Another restriction is the aperture regulation which has be able mechanical.

Normally adapted lenses have
_ no AF
_ are working with stop down metering (no automatic aperture)
_ and have no electronically communication between lens and camera.

Possible by FD but IMHO not realized are adapters from Rollei 66, Bronica.
An adapter for Mamiya RZ and RB lenses to Pentax 645 camera adapter is announced by Steib (Munich ) and Wiese (Hamburg).

Not possible are those from Rollei SLX (FD 74.00mm) because the lack of aperture regulation.

Medium format cameras like Contax 645 (FD 64.00mm), Hasselblad H, Leica S2 or Mamiya 645 (FD 63.30mm) have a flange distance which is smaller than those of the Pentax645, adapted lenses from these systems would not be able to focus on infinite.

Pentax 67 lenses to Pentax 645

Pentax 67 lenses have a FD of 84.95mm
It is not “third party” so Pentax offers directly an adapter. The aperture of the 67 is automatically stopped down during the exposure. "The aperture value is properly transmitted from the lenses to the camera by a mechanical simulator slider (which many people miss inside the small Pentax DSLRs), but there is no transmittion of a aperture value from the camera to the lenses --> no A-mode. Measurements in M-Mode and Av-Mode are working " (source Klaus123 in this thread)
Pentax 67 Lens to Pentax 645 Body Adapter Reviews - Pentax Lens Reviews & Pentax Lens Database

An overview of the adaptable lenses is given in the review part of this forum.

Hasselblad V-system lenses to Pentax 645

Hasselblad V lenses have a FD 74.90mm.

As I see there are four brands of adapters for Hasselblad V lenses to Pentax 645 cameras on market.
The "brands” are:
_ Kipon, a chinese made adapter
_ Rayq[al] (=Fotodiox?) japanese providence
_ Rugift an east european made adapter (Russian or Ukrainian origin)
_ Zörkendörfer ( “Zörk”), a german manufacturer.

Major lens supplier for this system: Carl Zeiss Oberkochen and Schneider-Kreuznach. There are also lenses from Fuji.
You can use lenses for the so called “Hasselblad V-system” (camera series 200, 500, 2000) with central (C, CF, CFi) or focal shutter (F, FE).

Selection of some Hasselblad V System lenses
Manufacturer: Carl Zeiss Oberkochen (execept Variogaon: Schneider-Kreuznach)
C =centralshutter, F focal shutter, both have the same mount and can be adaptetd to Pentax 645

Distagon CF 30mm (fisheye)
Distagon CF 40mm
Distagon CF 40mm FLE
Distagon CF 50mm
Distagon CF 50mm FLE
Distagon CF 60mm
Planar CF 80mm
Planar CF 100mm
Sonnar CF 150mm
Sonnar CF 180mm
Sonnar CF 250mm
Teletessar CF 350mm
Tele Apotessar CF 500mm [V1]
Tele Apotessar CF 500mm [V2]
UV-Sonnar CF 105mm
Makro-Planar CF 120mm
Makro-Planar CF 135mm
Variogon CF 140-280mm (Schneider)
Sonnar-Superachromat f/5.6 250 mm CFE
Tele-Superachromat f/5.6 350 mm CFE (IF)

Distagon f/2.8 50 mm FE (FLE)
Planar f/2.8 80 mm FE
Planar f/2 110 mm FE
Sonnar f/2.8 150 mm FE
Tele-Tessar f/4 250 mm FE
Tele-Superachromat f/2.8 300 mm TPP FE (IF)
Tele-Tessar f/4 350 mm FE (IF)
Apo Sonnar 4.0/1700mm FE

Pentacon Six [P6] bayonet lenses to Pentax 645

Pentacon Six [P6] lenses have a FD of 74.10mm.
Pentacon* Six [P6] was a Medium Format system which was built originally at Kamera Werke Dresden Germany (KW, later VEB Pentacon) first in the mid fifties (Praktisix). The breech mount was also used by Exakta 66 (West Germany) and the Ukrainian camera Kiev60 (Arsenal in Kiev, Ukraine). From the mid nineties the ukrainian Hasselblad clone Kiev80** was also produced with the P6 mount. Since the nineties the P6 mount has developed to the standard east European MF mount.
Arsenal stopped camera and lens production officially in 2009, but in time before in Kiev a lot of small spin offs manufactures and mechanical workshops (Arax, Hartblei....) offered accessories for the P6 system.

Out of my experience there are no “branded” adapters for P6 lenses to Pentax 645 on market. Most of the adapters on market are no name from small eastern european or chinese mechanic workshops.
I have seen adapters made from aluminium and of brass. IMHO the brass one is more preferable.

Major lens supplier for the P6 medium format system was VEB Carl Zeiss Jena (Germany), Schneider –Kreuznach (Germany), Meyer, Görlitz (later VEB Pentacon) (Germany), Arsenal (Ukraine) and spin offs (Arax, Hartblei…)

VEB Carl Zeiss Jena lenses for P6 :
Flektogon 4.0/50mm
Biometar 2.8/80mm
Biometar 2.8/120mm
Sonnar 2.8/180mm
Sonnar 4.0/300mm
Spiegelobjektiv 5,6/1000
(older lenses Flektogon 2,8/65; Tessar 2,9/80)

There are also P6-lenses from Meyer, Görlitz (later part of VEB Pentacon, lenses renamed in Prakticar)
Primotar E 3,5/80;
Trioplan 2,8/105;
Priotar 3,5/135;
Priotar 3,5/180;
Telemegor (later Pentacon) 4/300;
Telemegor 5,5/400;
Pentacon (and Prakticar) 5,6/500

There are also lenses from Schneider-Kreuznach, Arsenal and Kilfitt
Ukrainian workshops are offering a T/S 45mm lens.

P6-lensesfrom Schneider Kreuznach (Germany)
Curtagon MF 40 4
Curtagon MF 60 3.5
Xenotar MF 80 2.8
Tele-Xenar MF 150 4
Tele-Xenar MF 250 5.6
Variogon MF 75-150 4.5
Variogon MF 140-280 5.6
Special lenses:
PCS Super-Angulon MF 55 4.5 (Shift)
Symmar-S 135 5.6
Symmar-S 180 5.6
M-Componon 28 4
M-Componon 50 4

P6-lenses from Kiev (Ukraine)
Zodiak-8B 30mm 3.5 (fisheye)
Mir-26B 45mm 3.5
Mir-69B (4) 45mm 3.5
Mir-3B (5) 65mm 3.5
Mir-38B 65mm 3.5
Volna-3 80mm 2.8
Vega-12 (10) 90mm 2.8
Vega-28B 120mm 2.8
Kaleinar-3B 150mm 2.8
Jupiter-36B 250mm 3.5
Telear-5B (11) 250mm 5.6
Tair-33 300mm 4.5
Arsat APO MC (12)f/5.6 / 500mm
(please note not all Kiev lenses are multicoated)

* historical remark: the names Pentax and Pentacon have the same historic roots. In the late 40ies Zeiss Ikon Dresden (East Germany) invented the 135 SLR Contax with Pentaprism and M42 thread mount. Because of differences in naming between Carl Zeiss (Oberkochen) (West Germany) and VEB Carl Zeiss Jena (East Germany), in Dresden (East Germany) was decided to brand the SLR in the late 50ies as Pentacon which derives from Pentaprism contax.
Some licences were sold to Asahi Japan which named their SLR as Pentaprism Contax.

Later both SLR brands named the manufacturer.

** There is the possibility to adapt Kiev80 lenses (with “original” Hasselblad F1000 threat mount) to P6.

Exotics to Pentax 645

_Leica Visoflex lenses

Some Leica lenses for the Visoflex system have their origin in Great Format lenses, so the image circle and FD allow adapting these lenses. Leica Visoflex M39 screw mount lens, i.e., 65mm f3.5, telyt 135mm F4, Telyt 200mm F4, 280mm F4.5 and others.
There are no commercial made "direct" adapters known, but there "indirect" ways:
a) Leica Visoflex M39 Lens to Hasselblad Mount Adapter (e.g. rugift) + Hasselblad to P645 adapter

b) Leica Visoflex M39 Lens to Pentax 67 Adapter + Pentax 67 to Pentax 645 adapter

_ Novoflex Schnellschuss System

The “Novoflex Schnellschuss System” was rapid focus system for telelenses from the pre AF era. It was a combination of a rapid focus head with changeable mounts and a tele lens optical system. (there were 400mm and 500 tele lenses from Novoflex and Leica.
Some Hasselblad literature indicates that it can used also on 60x60mm MF cameras. The mount name for Pentax 645 is “TAXPRO”

Mamiya RZ and RB lenses to Pentax 645 camera adapter

Steib (München) and Wiese (Hamburg) are offering a Mamiya RZ and RB lens to Pentax 645 (and Cx 645, Mamiya 645) adapter. It made partial from Mamiya parts, price is about 1100€
HCam-Adapter: Mamiya-RB-/RZ-Objektive an Mamiya / Phase One 645 (aktualisiert) | photoscala
Incredible post and list of lenses. Would there be a way to mount to Contax 80mm f2 onto the Pentax 645? If not, is there anything mountable (with adapter) similar to the Pentax 55mm, but faster stop, something like F2? Very fast. Thank you.

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