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Hack the DX code on your 35mm film

Steve B
Eminent Member

Hi folks.

I've just bought a rain proof film point and shoot; a lovely example of the Konica MR.640 - it's a camera little known outside of Japan, which means prices are much reduced over other alternatives. Mine was £39 plus post, an absolute bargain.

An all-weather street shooter, it has no way of manually adjusting the ISO of loaded film. My preference is to feed it T-Max P3200 (TMZ) rated at 800 but of course, that's not possible with the camera's auto DX reader. Until now. Despite what's on the box, TMZ actually has a nominal speed of 1000 when professional T-Max developers are used and 800 with other Kodak chemistry. I've shot four rolls of TMZ at 800 ISO to date, all sat in the freezer and due to go off for processing early next week. 800 ISO, from what I've seen of image examples elsewhere, gives a look I absolutely love, with tightly controlled grain, deep blacks and a texture to images that has bags of character. 

Fooling the DX system into exposing the TMZ I've put in the Konica has proven childishly simple via the following guide:

Raised by Direwolves. Warden of the north for House Stark. Dancing master. Winter is here...

Topic starter Posted : 28/08/2021 5:37 pm
Angela J liked
Angela J
New Member

Excited to see the images once you’ve had them processed Steve 🙂

Posted : 28/08/2021 6:50 pm
Steve B liked
Steve B
Eminent Member

Hi Angela.

Thanks for that.

My daughter got married last year in August but could only have 15 at the event under the then current restrictions. This year they had their wedding blessing, also in August with a full quota of guests. I shot several rolls of TMZ, so much of it is personal stuff. I deliberately fielded the Leica M3 with TMZ as I knew I'd be the only film shooter present and that the results would be quite different to everything else. I also ran through some Kodak ColourPlus 200 that has a real vintage rendering, being Kodak's oldest production film emulsion.

Daniel Milnor ('Shifter' on You Tube) is a great lover of TMZ and observed that the correct way to approach a film is to regard it as a language and to learn it as such. I think that's the perfect way to go about it, so my exploration of TMZ at the moment is very much at the 'baby steps' stage. I don't expect to become fluent in it for quite a while yet but the idea of really getting under the skin of TMZ and approaching images with an intuitive understanding of how that film behaves at 800 ISO is very appealing.

TMZ at 800 ISO is apparently reminiscent of vintage Tri-X from the 1940s and 1950s and that sets my heart a real pitter patter indeed. If I get anything decent off of what I've shot so far I'll happily share it.




Steve Von Shootitonfilm      


Raised by Direwolves. Warden of the north for House Stark. Dancing master. Winter is here...

Topic starter Posted : 28/08/2021 7:34 pm
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