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Out of focus

I recenlty bought a used mamiya 7 with a 67 mm lense. It is sharp in the middle of the negatives but the eages out of focus. What could be the problem?

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Hey Paul FB,
One reason this could be happening is if the film pressure plate is set incorrectly. If you are using 120 film you should of course have it set to 120, and if you’re using 220 film you should have it set to 220. If you have the pressure plate set correctly the plate might be broken, and I would have the camera looked at by an authorized service technician. If your subject is in the middle of the frame and the edges of your images are either background or foreground you might just have the aperture set to a large aperture resulting in a shallow depth of field. I hope this helps!

Sincerely,
Allan
Go Ahead. Use Us.

Posted on May 23, 2008

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Lenses on K10D do not focus correctly on low f stops eg; f1.4/2.0 but focus well on higher f stops eg f11. On the lower f stops the lenses are back focusing by around 4 to 5 cm. Any help Thanks


Although you think the lens is in focus, when stopped down, I know it is not.
There are enough articles that tell about Depth Of Field, but I give a short explanation.
The DOF from a 50 mm lens on a APS-C camera, when set to f /1,4. when you focus on 1 meter, is just 2 cm when on f /4 you have a totoal of 6 cm and on f /11 it is 11cm. So wen your camera / lens combination has a back focus of about 5 cm, it will come within the 11 cm you get in f /11. Still the picture is not in focus, but you see what you want to see sharp.
I searched through the complete manual, scanned the review on Dpreview and searched the site from Richo, but noting to find about correcting back or front focus. on the K10D. Perhaps, because in the days this camera came on the market, they thought the photographer who uses f /1.4 lenses is used with manual focus.
I'm, not sure, but perhaps someone on the Richo / Pentax service centre can tell you, if they can correct the setting for your lens.

To my experience, the front or back focus is in the camera. (the six or 7 lenses I use on my camera, all have the same back focus, but my Nikon has a setting to correct that.

So if you want to use your lens without any change made to your camera, there is only one option, focus manually.

Sorry I could not find more.
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Have a look at this page for discussion about this adapter. Depending on the lens you're using it with - the DOF can be extremely shallow and make focusing difficult. If you're in Auto Focus mode - try switching to manual and see if you can get better results.

Good luck!

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Focusing a mamiya k/l lens.how do i use the floating element ring? thank's


Step A. Set the floating element ring to its' infinity position (if you are using extension tubes, this will vary and you must set according to the tubes).
Step B. Focus the camera on your subject.
Step C. Look at the bellows scale on the camera body (it will generally range from 0-40) Important: Don't read the scale akin to the lens you are using. This will make perfect sense, when you examine the bellows. Mentally record this number.
Step D. Adjust the floating element ring to the recorded number.
Step E. Leave the ring on this new setting and re-focus the camera on your subject.
Step F. Make sure the dark slide is removed and capture your photograph. :)
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I asked about the distance relative to the lens length because the DOF can really change based on this. I have found this recently with my macro work so I wanted to find out if you have experimented with this or fired a bunch of shots at a single setup.

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Hey redbarnz,
If the lens won't focus to infinity then there is probably something physically wrong with the lens. With the dominance of digital equipment you can find fantastic deals on manual focus 35 mm lenses. I would look at Canon manual focus lenses rather than sticking with vivitar. I hope this helps!

Sincerely,
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Unsharpness


if you can acquire sharp image with your 80mm, but not the 50mm and 120mmmm, there is no problem with your camera body, i.e. lens-flange to film plane. but how come you can not manage to get a sharp spot anywhere from the full turn of focusing rings with your 50mm and 120mm, unless the lens units inside these 2 lenses shifted. i doubt this happened to both lenses simultaneously?

if you are sure that your lenses have problem, send them for focusing test, since they are good and expensive lenses.

pc-cook

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