‘One Third Keepers’ with a Minolta Dynax 7 and Kentmere Pan 400 exposed at ISO 200

By Bob Janes

The idea of ‘One third keepers’ came out of online chats I took part in about 15-20 years ago.  We discussed hit rates of chosen to unchosen shots and whether digital photography had just become ‘spray and pray’. The general consensus was that, allowing for bloopers and duplicate ‘insurance’ shots, a reasonably successful roll of film was one where you would be prepared to share a third of the resulting images.

Minolta Dynax 7 / Kentmere Pan 400 (pulled) / Perceptol

Camera and lenses: This is probably the most capable analogue camera I own. While it might not have the fastest shutter of all or the most frames-per-second, it does represent just how good analogue SLR cameras got before the digital tide changed the whole landscape.

The lenses I used were: a pair of first generation 20 and 24 Minolta AF lenses, plus a 50 and 100 macro, which are Sony versions of Minolta originals.

Film and processing: The film was Kentmere Pan 400 (K400). After trying Kentmere Pan 200 (K200), I was curious to see how K400 would match up in comparison if shot at the same speed. I processed in the same stock Perceptol as the K200, shortening the developing time as directed by my smartphone app. With the pulled developing and the British summer temperatures we have been getting, I ended up with a developing time of about 4 minutes 30 seconds. The resulting negative strips were scanned as TIFF files by a Plustek OpticFilm 135i scanner and processed and output as web-sized JPGs in DXO PL 7 with a final tweak in PSP.

Locations: Shots were taken on a walk Along the South Bank of the Thames and a Visit to Docklands.

Pictures (12 of 36)

The Shard, London Bridge
Golden Hind replica, South Bank
Watertight door, HMS Belfast
Forward guns of HMS Belfast – These are elevated to aim at the Scratchwood service station 11.5 miles away on the M1 – Not as a threat against ‘Welcome Break’ but simply as a demonstration of the range of these naval guns
Electrical rig
Captain’s chair
Tower Bridge from the south
The Tower of London from the East
A docklands crane from below
Horses drawing Nike’s chariot atop the Wellington Arch
Landseer Lion guarding Nelson’s Column
Escalator, Woolwich station

 

Closing thoughts

The Dynax 7 is wonderfully capable and a delight to use. On picking it up to load the K400 and set the non-standard ISO setting I was after, I was a bit perturbed to see that it was missing the actuating button and scale for the exposure compensation dial. This camera does tend to get pulled in and out of camera bags quite a bit and I’m guessing that, at some point, the top of the dial caught on something and was pulled off. I’ve looked in all the camera bags I currently use, but haven’t found it yet.

Missing in action. The two-way compensation dial and lock button seem to have come astray.

We don’t need no (exposure) compensation…

Luckily, I tend to use the AE lock rather than the exposure compensation. In any case, if I stab my little finger into the slot on top, I can engage the release button that allows compensation to be set and the amount of compensation is shown on the Dynax 7’s rear screen. If I find the missing bit, I’ll have a go at replacing it. In the meantime I’ll maybe look for something that can act as a blanking plate (possibly a small coin) and regard it as honourable battle scars.

Another thing in the Dynax 7’s favour is that it will work with any A-mount lens ever produced, whether they have internal motors or not. For this film I tended to use a combination of 20, 24, 50, and 100 macro.

The results with the Perceptol seem quite good, comparable to my eye with K200 in the same developer. I may try pulling some K400 in R09 as an option to K200. Although I quite like the new K200 film, I do find the flatness of K400 to be a boon when scanning. I guess pushing Kentmere Pan 100 to ISO 200 is another option.

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About The Author

By Bob Janes
Retired IT guy. Volunteer stem-cell courier. Interested in education, photography and local history. Lives in Greenwich, SE London, UK.
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Comments

Gary Smith on ‘One Third Keepers’ with a Minolta Dynax 7 and Kentmere Pan 400 exposed at ISO 200

Comment posted: 29/08/2025

For some reason I thought that I'd read this but I didn't recognize any of the attached images. I'd like to say 1/3 is on the low end for me but I'd be lying. I'm happy if I get one or two (depending on how long I was out and what I was shooting). If I'm shooting film, I'd be happy with 10 out of 36 exposures.

I never owned a Minolta but I suspect that my early Sony A-mount lenses had a Minolta heritage.

Thanks for sharing Bob.
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JA replied:

Comment posted: 29/08/2025

Not just you. I have a weird deja vu woth this one aswell. My current hit rate i am happy if i don't just get 36 bland underexposed rectangles.

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Bob Janes replied:

Comment posted: 29/08/2025

I've been doing a few of these - one with my STR 101 (https://www.35mmc.com/15/08/2025/one-third-keepers-with-kentmere-pan-200-and-a-minolta-srt-101/) and another with an Autoreflex (https://www.35mmc.com/27/07/2025/one-third-keepers-with-kentmere-pan-200-and-a-konica-autoreflex-t3/) and there are a few more in the works. At the end of the day, It is a device to display slightly more images than we normally get with the '5 frames' :-)

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Geoff Chaplin on ‘One Third Keepers’ with a Minolta Dynax 7 and Kentmere Pan 400 exposed at ISO 200

Comment posted: 30/08/2025

Stunning shot of the Shard - not a view I remember seeing when I pass by. The Hind too, excellent composition, as are many of the others. Keep them coming Bob!
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Bob Janes replied:

Comment posted: 30/08/2025

Thank you!

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Jeffery Luhn on ‘One Third Keepers’ with a Minolta Dynax 7 and Kentmere Pan 400 exposed at ISO 200

Comment posted: 30/08/2025

Those are some really nice full scale images. That location offers a lot in the way of graphic compositions and you did a fine job taking advantage. I think the 1/3 rule is more attainable in film because we know the number of exposures is limited. Sometimes I'll take a shot on film, spending time to get a good composition and exposure, and just take one frame. I never do that with digital. In fact my first image is almost always a throwaway just so I can look at the LCD to refine the image. This is not a bad thing. It's just a different approach to the workflow. Many of us thoughtful photographers don't engage in spray and pray, even though we take multiple frames. Pixels are free, so it gives us the chance to refine our work. Back in the day, I had Polaroid backs for my Hasselblads, RB 67, and 4x5 cameras. It was a curse and a blessing. With 30 employees in my three studios, the Polaroid bill ran as high as $3,000 a month!!! My shooters would take a polaroid of a product shot, make a tiny adjustment, and take another polaroid. OW!!! I really had to crack down on that. Now we can shoot endless shots to arrive at the final shot with no financial impact. I have often fantasized about having a full from digital camera, big screen Mac, Photoshop, and a high quality color printer in 1979. I COULD HAVE CONQUERED THE WORLD!!!! Oh well, getting 1/3 keepers with film was a good measure back then, and it's still valid!
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Bob Janes replied:

Comment posted: 30/08/2025

There were a number of 'challenges' we did around this idea over at Dyxum - at one time we played with the idea of doing a digital version (I can't remember if we ever actually did it) - where we used small capacity cards to limit ourselves to a small number of images... But that mayy have been an instance of us just trying to make things a little tooo hard for ourselves..

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Ibraar Hussain on ‘One Third Keepers’ with a Minolta Dynax 7 and Kentmere Pan 400 exposed at ISO 200

Comment posted: 30/08/2025

Thanks Bob
Quite so - a 1/3 hit rate of keepers is the minimum I tend to aim for - insurance shots and alternative framing takes up a fair few frames

The Dynax 7 is exceptional isn’t it ? The metering is superb - ergonomics and feel as well.
Mine gave up on me with a broken door a couple months back. I’ve not got a a-9 which feels great but lacks the wizardry of the 7.
Very very nice photography (as usual)
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Bob Janes replied:

Comment posted: 30/08/2025

It is lovely, but often the back catch goes. I have to stop myself from looking at ebay '9' sales...

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Ibraar Hussain replied:

Comment posted: 30/08/2025

The 9 is very very nice. The huge VF and the sound / feel of the shutter, the solidity of it, it’s a keeper, quite a bit nicer than the Sony A900 - though I’ve only shot 1 roll through it

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Keith Drysdale on ‘One Third Keepers’ with a Minolta Dynax 7 and Kentmere Pan 400 exposed at ISO 200

Comment posted: 30/08/2025

In good hands the Dynax cameras are great, as you show. I used to regard auto focus with contempt but now find it to be a great aid to composition. That's a good read.
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Bob Janes replied:

Comment posted: 30/08/2025

I know what you mean. I did start to find myself being rather too drawn to the centre of the frame with rangefinder and traditional split-image/microprism cameras. There is a lot to be said for a plain ground-plans screen, or zone/scale focus - it gets you paying more attention to the edges of the frame...

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Alexander Seidler on ‘One Third Keepers’ with a Minolta Dynax 7 and Kentmere Pan 400 exposed at ISO 200

Comment posted: 02/09/2025

Great shots Bob !
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