GXR M Mount, adapter and vintage SLR lenses

Discussion about Ricoh GXR M-mount module and lenses

Re: GXR M Mount, adapter and vintage SLR lenses

Postby Tom Caldwell » Mon Dec 02, 2013 2:35 pm

Rohan,

Glad to see you experimenting with larger size lenses. I have found this productive myself. The GXR works very well with RF lenses but there is no reason whynit cannot handle quite large lenses.

The largest I have seriously used on the GXR has been a Canon FD 200mm f2.8. For a lens of this capability it is not over large or over heavy.

Tom
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Re: GXR M Mount, adapter and vintage SLR lenses

Postby RDM » Fri Dec 13, 2013 8:49 am

A quick bit of CAD modelling, some 3D printing and now the Agfa lenses fit on the GXR.

ricohgxragfa1.jpg
ricohgxragfa1.jpg (297.38 KiB) Viewed 1242 times

EXIF-Data
Image taken on: Fri Dec 13, 2013 3:40 pm
Focus length: 6 mm
Shutter speed: 1/30 Sec
F-number: F/1.9
ISO speed rating: 114
Whitebalance: Auto
Flash: Flash did not fire, compulsory flash mode
Camera-model: GR DIGITAL 4
Exposure program: Normal program
Exposure bias: 0 EV
Metering mode: Pattern

ricohgxragfa2.jpg
ricohgxragfa2.jpg (175.04 KiB) Viewed 1234 times

EXIF-Data
Image taken on: Fri Dec 13, 2013 4:02 pm
Focus length: 6 mm
Shutter speed: 1/30 Sec
F-number: F/1.9
ISO speed rating: 125
Whitebalance: Auto
Flash: Flash did not fire, compulsory flash mode
Camera-model: GR DIGITAL 4
Exposure program: Normal program
Exposure bias: 0 EV
Metering mode: Pattern


Unfortunately image quality with the lenses is pretty bad. Not sure what's going on as I'm inexperienced in the world of vintage lenses. Fog (although they seem pretty clear just looking at them)? Do I need to paint the inside of the adapter matt black (the plastic isn't really that translucent)?

35mm
agfa35mmlens.jpg
agfa35mmlens.jpg (203.46 KiB) Viewed 1230 times

EXIF-Data
Image taken on: Fri Dec 13, 2013 3:38 pm
Focus length: 0 mm
Shutter speed: 1/48 Sec
F-number: F/0
ISO speed rating: 200
Whitebalance: Auto
Flash: Flash did not fire, compulsory flash mode
Camera-model: GXR MOUNT A12
Exposure program: Normal program
Exposure bias: 0 EV
Metering mode: Center-weighted average


50mm
agfa50mmlens.jpg
agfa50mmlens.jpg (235.47 KiB) Viewed 1232 times

EXIF-Data
Image taken on: Fri Dec 13, 2013 3:37 pm
Focus length: 0 mm
Shutter speed: 1/60 Sec
F-number: F/0
ISO speed rating: 200
Whitebalance: Auto
Flash: Flash did not fire, compulsory flash mode
Camera-model: GXR MOUNT A12
Exposure program: Normal program
Exposure bias: 0 EV
Metering mode: Center-weighted average


90mm
agfa90mmlens.jpg
agfa90mmlens.jpg (224.77 KiB) Viewed 1234 times

EXIF-Data
Image taken on: Fri Dec 13, 2013 3:35 pm
Focus length: 0 mm
Shutter speed: 1/32 Sec
F-number: F/0
ISO speed rating: 200
Whitebalance: Auto
Flash: Flash did not fire, compulsory flash mode
Camera-model: GXR MOUNT A12
Exposure program: Normal program
Exposure bias: 0 EV
Metering mode: Center-weighted average


Cheers

Rohan
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Re: GXR M Mount, adapter and vintage SLR lenses

Postby Tom Caldwell » Fri Dec 13, 2013 11:09 am

Looks like a pretty neat job Rohan. Maybe if you turned the EV down a little?

Tom
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Re: GXR M Mount, adapter and vintage SLR lenses

Postby RDM » Fri Dec 13, 2013 12:02 pm

Thanks Tom.

Yep. It needs to be painted. I just wrapped my hand around the adapter to cover it and took a couple more shots - huge difference. The adapter is simply too translucent. I will give it a coat of matt black internally and shoot some more with it.

Cheers

Rohan
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Re: GXR M Mount, adapter and vintage SLR lenses

Postby RDM » Sat Dec 14, 2013 12:46 am

All painted now and that has fixed the "faded look" present in the initial images. Will be fun to test these old rangefinder lenses out. They look to be promising.
R0010556.jpg
R0010556.jpg (310.79 KiB) Viewed 1223 times

EXIF-Data
Image taken on: Sat Dec 14, 2013 8:56 am
Focus length: 6 mm
Shutter speed: 1/40 Sec
F-number: F/1.9
ISO speed rating: 80
Whitebalance: Auto
Flash: Flash did not fire, compulsory flash mode
Camera-model: GR DIGITAL 4
Exposure program: Normal program
Exposure bias: 0 EV
Metering mode: Pattern


Beige on beige on beige
R0010581.JPG
R0010581.JPG (381.71 KiB) Viewed 1211 times

EXIF-Data
Image taken on: Sat Dec 14, 2013 9:04 am
Focus length: 0 mm
Shutter speed: 1/440 Sec
F-number: F/0
ISO speed rating: 200
Whitebalance: Auto
Flash: Flash did not fire, compulsory flash mode
Camera-model: GXR MOUNT A12
Exposure program: Normal program
Exposure bias: 0 EV
Metering mode: Center-weighted average
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Re: GXR M Mount, adapter and vintage SLR lenses

Postby RDM » Tue Jan 28, 2014 2:02 am

A couple of recent shots using the Agfa 35mm lens.
agfa_35mm_lens_flowers_1.jpg
agfa_35mm_lens_flowers_1.jpg (122.69 KiB) Viewed 1047 times

agfa_35mm_lens_flowers_2.jpg
agfa_35mm_lens_flowers_2.jpg (249.17 KiB) Viewed 1042 times
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Re: GXR M Mount, adapter and vintage SLR lenses

Postby Blow-in » Tue Jan 28, 2014 11:17 am

Great results! The lenses look really good too on your M module.

Richard
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Re: GXR M Mount, adapter and vintage SLR lenses

Postby Tom Caldwell » Tue Jan 28, 2014 11:07 pm

Rohan, you have done a great job with those adpapters. An inspiration to us all.

Tom
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Re: GXR M Mount, adapter and vintage SLR lenses

Postby RDM » Wed Jan 29, 2014 12:02 am

Thanks for the kind words Tom and Richard.

The help and advice on offer on this forum has been great and has fired my interest in photography again.

The Agfas seem to be working well. They have less contrast than more modern multicoated lenses but I personally can't fault their sharpness.

Hopefully with their single coating they may prove to be excellent for black and white - that is if you believe what you read on the internet on this subject.

I only wish they made a wider lens than the 35mm.

I think I'm going to "bite the bullet" and get some aluminium adapters made up to replace the plastic one I've built. Just wanted to wait and make sure the lenses were worth it.

Cheers

Rohan
Last edited by RDM on Thu Jan 30, 2014 12:18 pm, edited 1 time in total.
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Re: GXR M Mount, adapter and vintage SLR lenses

Postby Tom Caldwell » Wed Jan 29, 2014 3:33 am

Rohan,

Just curious as to how you made the adapter. The process of 3D printing is known to me (but not presently used) and I understand that some knowledge of CAD is necessary to make the object. That said I can see how you have ingeniously usd a LM adapter as a host for your "made" adapter extension. Obviously thinking on your feet.

How do you fit the extension on to the Agfa lens? Is it merely screw attached or is there some other way that the lens is attached to the lens end by your extension that replicates an Agfa female mount.

I am curious for two reasons. Firstly that an Agfa Silette was my very first camera back in the 1960's. It must be a different model becasue as far as I know the lens was a fixed attachment. But I have no intention of trying to collect Agfa lenses and do not need this adapter mount.

The curiosity is from a fellow "adapter manufacturer" who has managed to figure out the maths and successfully manufacture a M42 conversion for the Meyer Telefogar lens in Altix mount. The process needs a metal lathe and some greater skills than I usually possess to drive it. But I do have a small metal lathe and managed to get my M42 conversion - including infinity focus. In this case it is a simple replacement of one adapter end with another. I have not perfected it. The M42 screw thread is force-fit and stays rigidly in place but can be popped off if the lens is over tightened. I have to make a mechanical fixing and this will probably need a couple of tiny screws which I think I might have to make. I am reluctant to use glue as the M42 threads would have to come off if the lens itself was ever in need of accessing.

Right now it is a 90% complete work in progress and is a neat job - I have to be careful that a rush to complete the last 10% spoils the professionalism.

Tom
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