Pentacon Six lenses on a digital small sensor body

Cloapex · 11-12-2014, 06:14 AM

I´m hinking of buing a volna 3 or a Biometar 80/2.8 and adopt to my Pentax K-5. They can easily be found very cheap in Europe where I live.
Only thing i think about is if the best hing is to have 'Pentacon 6 to M42 adapter or a Pentacon 6 to PK-adapter.

The think i like with M42 is to shoot in AV-mode and I tend mostly to shoot wide open or stopped down one or two notches and then the viewfinder is bright enough to shoot this way. I guess if I buy a Pentacon 6 to K-adapter I will probably have to press the green button all the time as a PK-manual??

If i understand it correctly sharpness and abboration would be good. I wood just use the center bit of the lens due to a smaller sensor but the FOV would be different off course.
Also i would need a little middle ring to put the lens to the correct sensor distance?

Found the distance to be 74.1

Last edited by Cloapex; 11-12-2014 at 06:38 AM.

**boriscleto** · 11-12-2014, 06:53 AM

Originally posted by Cloapex

I´m hinking of buing a volna 3 or a Biometar 80/2.8 and adopt to my Pentax K-5. They can easily be found very cheap in Europe where I live.
Only thing i think about is if the best hing is to have 'Pentacon 6 to M42 adapter or a Pentacon 6 to PK-adapter.

The think i like with M42 is to shoot in AV-mode and I tend mostly to shoot wide open or stopped down one or two notches and then the viewfinder is bright enough to shoot this way. I guess if I buy a Pentacon 6 to K-adapter I will probably have to press the green button all the time as a PK-manual??

If i understand it correctly sharpness and abboration would be good. I wood just use the center bit of the lens due to a smaller sensor but the FOV would be different off course.
Also i would need a little middle ring to put the lens to the correct sensor distance?

Found the distance to be 74.1

There is not aperture actuator on the adapter, so the K-mount adapter will work the same way as the M42 adapter.

There is no need to adjust the sensor distance, that is what the adapter does. The lens will have the same field of view as any other 80mm lens on APS-C.

Cloapex · 11-12-2014, 06:58 AM

Great! Anyone tested?

Favourite Pentacon 6/Kiev lenses?

tryphon4 · 11-12-2014, 07:12 AM

I own a "Pentacon six to PK" tilt adapter and I owned a VOLNA III 80mm/2.8.
It is an interesting setup, I mainly performed tilt shot using it.
I sold the lens a few months ago because I don't need it anymore (I now own an APO Rodagon 90mm f/4 and a Zoerk MFS so it is a better tilt setup), I still have the adapter and plan to buy a wider Pentacon six lens (45mm maybe).

Interesting link: Pentacon Six mount - Wikipedia, the free encyclopedia

Stone G. · 11-12-2014, 07:26 AM

Originally posted by Cloapex

If i understand it correctly sharpness and abboration would be good. I wood just use the center bit of the lens due to a smaller sensor but the FOV would be different off course.

Yes, the FOV will be smaller with the smaller sensor - but no, you will actually NOT only be using the center bit of the lens. You will still be using the entire lens front which you may "realize" if you draw a parallel bundle of light rays that focuses on the sensor. All rays entering into the lens will actually reach the sensor.

Originally posted by boriscleto

There is not aperture actuator on the adapter, so the K-mount adapter will work the same way as the M42 adapter.

Which actually means that with this setup one can use the camera in Av-mode - right?

**boriscleto** · 11-12-2014, 07:35 AM

Originally posted by Stone G.

Which actually means that with this setup one can use the camera in Av-mode - right?

Yes. The lens stops down when you turn the aperture ring. Just like an M42 lens set to M. The Exif will say M42 or no lens.

stevebrot · 11-12-2014, 10:33 AM

This is possible to do, much as it is possible to mount Pentax 645 and Pentax 67 lenses on K-mount. I would caution that there may be some disappointment in regards to image quality. Images from medium and large format lenses often suffer when subjected to a significant crop and APS-C is a significant crop.

Steve

tryphon4 · 11-12-2014, 01:38 PM

Here are several shots using "Pentacon six to PK" tilt adapter, VOLNA III 80mm/2.8 lens and a K100D camera:

https://farm6.staticflickr.com/5057/5582499673_942cc857af_o.jpg
https://farm6.staticflickr.com/5015/5583085592_2489921317_o.jpg
https://farm6.staticflickr.com/5097/5583086318_67c4028d2f_o.jpg
https://farm6.staticflickr.com/5069/5582500757_5f34051cae_o.jpg
https://farm6.staticflickr.com/5229/5583087708_ff221c6ab7_o.jpg

**savoche** · 11-12-2014, 02:02 PM

I have a beat-up Biometar 80/2.8, and it works very well with a PK-adapter. Quite nice at 2.8, very sharp at 5.6. It's not a small lens, though...

cxdoo · 11-13-2014, 05:52 AM

I had (technically still have

) Biometar 80/2.8 until I tried to 'fix' it so now there it is in pieces in its own box. I took a number of photos with it and was very pleased with the IQ. The only one I have put up is this one; slight blur is because of my/subject movement, when used properly this lens is very sharp.
I'd get another one, but by not doing so maybe I force myself to assemble it eventually. If dcshooter was in Europe, I'd send it to him if just to put it back in one piece.

11-12-2014, 06:14 AM	#1
Cloapex Senior Member Join Date: Dec 2012 Photos: Gallery \| Albums Posts: 166	Pentacon Six lenses on a digital small sensor body I´m hinking of buing a volna 3 or a Biometar 80/2.8 and adopt to my Pentax K-5. They can easily be found very cheap in Europe where I live. Only thing i think about is if the best hing is to have 'Pentacon 6 to M42 adapter or a Pentacon 6 to PK-adapter. The think i like with M42 is to shoot in AV-mode and I tend mostly to shoot wide open or stopped down one or two notches and then the viewfinder is bright enough to shoot this way. I guess if I buy a Pentacon 6 to K-adapter I will probably have to press the green button all the time as a PK-manual?? If i understand it correctly sharpness and abboration would be good. I wood just use the center bit of the lens due to a smaller sensor but the FOV would be different off course. Also i would need a little middle ring to put the lens to the correct sensor distance? Found the distance to be 74.1 Last edited by Cloapex; 11-12-2014 at 06:38 AM.

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11-12-2014, 06:53 AM	#2
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,475	Originally posted by Cloapex I´m hinking of buing a volna 3 or a Biometar 80/2.8 and adopt to my Pentax K-5. They can easily be found very cheap in Europe where I live. Only thing i think about is if the best hing is to have 'Pentacon 6 to M42 adapter or a Pentacon 6 to PK-adapter. The think i like with M42 is to shoot in AV-mode and I tend mostly to shoot wide open or stopped down one or two notches and then the viewfinder is bright enough to shoot this way. I guess if I buy a Pentacon 6 to K-adapter I will probably have to press the green button all the time as a PK-manual?? If i understand it correctly sharpness and abboration would be good. I wood just use the center bit of the lens due to a smaller sensor but the FOV would be different off course. Also i would need a little middle ring to put the lens to the correct sensor distance? Found the distance to be 74.1 There is not aperture actuator on the adapter, so the K-mount adapter will work the same way as the M42 adapter. There is no need to adjust the sensor distance, that is what the adapter does. The lens will have the same field of view as any other 80mm lens on APS-C.

11-12-2014, 06:58 AM	#3
Cloapex Senior Member Join Date: Dec 2012 Photos: Gallery \| Albums Posts: 166 Original Poster	Great! Anyone tested? Favourite Pentacon 6/Kiev lenses?

11-12-2014, 07:12 AM	#4
tryphon4 Pentaxian Join Date: Apr 2011 Location: Drome, France Posts: 304	I own a "Pentacon six to PK" tilt adapter and I owned a VOLNA III 80mm/2.8. It is an interesting setup, I mainly performed tilt shot using it. I sold the lens a few months ago because I don't need it anymore (I now own an APO Rodagon 90mm f/4 and a Zoerk MFS so it is a better tilt setup), I still have the adapter and plan to buy a wider Pentacon six lens (45mm maybe). Interesting link: Pentacon Six mount - Wikipedia, the free encyclopedia

11-12-2014, 07:26 AM	#5
Stone G. Pentaxian Join Date: Jun 2010 Location: North Zealand, Denmark Photos: Gallery \| Albums Posts: 1,516	Originally posted by Cloapex If i understand it correctly sharpness and abboration would be good. I wood just use the center bit of the lens due to a smaller sensor but the FOV would be different off course. Yes, the FOV will be smaller with the smaller sensor - but no, you will actually NOT only be using the center bit of the lens. You will still be using the entire lens front which you may "realize" if you draw a parallel bundle of light rays that focuses on the sensor. All rays entering into the lens will actually reach the sensor. Originally posted by boriscleto There is not aperture actuator on the adapter, so the K-mount adapter will work the same way as the M42 adapter. Which actually means that with this setup one can use the camera in Av-mode - right?

11-12-2014, 07:35 AM	#6
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,475	Originally posted by Stone G. Which actually means that with this setup one can use the camera in Av-mode - right? Yes. The lens stops down when you turn the aperture ring. Just like an M42 lens set to M. The Exif will say M42 or no lens.

11-12-2014, 10:33 AM	#7
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	This is possible to do, much as it is possible to mount Pentax 645 and Pentax 67 lenses on K-mount. I would caution that there may be some disappointment in regards to image quality. Images from medium and large format lenses often suffer when subjected to a significant crop and APS-C is a significant crop. Steve

11-12-2014, 01:38 PM	#8
tryphon4 Pentaxian Join Date: Apr 2011 Location: Drome, France Posts: 304	Here are several shots using "Pentacon six to PK" tilt adapter, VOLNA III 80mm/2.8 lens and a K100D camera: https://farm6.staticflickr.com/5057/5582499673_942cc857af_o.jpg https://farm6.staticflickr.com/5015/5583085592_2489921317_o.jpg https://farm6.staticflickr.com/5097/5583086318_67c4028d2f_o.jpg https://farm6.staticflickr.com/5069/5582500757_5f34051cae_o.jpg https://farm6.staticflickr.com/5229/5583087708_ff221c6ab7_o.jpg

11-12-2014, 02:02 PM	#9
savoche Master of the obvious Join Date: Jun 2011 Location: Lowlands of Norway Posts: 18,311	I have a beat-up Biometar 80/2.8, and it works very well with a PK-adapter. Quite nice at 2.8, very sharp at 5.6. It's not a small lens, though...

11-13-2014, 05:52 AM	#10
cxdoo Pentaxian Join Date: Apr 2014 Location: Limassol, Cyprus Posts: 1,150	I had (technically still have ) Biometar 80/2.8 until I tried to 'fix' it so now there it is in pieces in its own box. I took a number of photos with it and was very pleased with the IQ. The only one I have put up is this one; slight blur is because of my/subject movement, when used properly this lens is very sharp. I'd get another one, but by not doing so maybe I force myself to assemble it eventually. If dcshooter was in Europe, I'd send it to him if just to put it back in one piece.