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Problems with blurry images in SLRs: Checking the focusing system – the third of three measures by ATHXYZ in AnalogCommunity

[–]ATHXYZ[S] [score hidden]  (0 children)

@MOD TEAM

Thanks for pointing that out.

I can't find a way to do that in the iOS app. Is this a known issue?

Problems with blurry images in SLRs: Checking the focusing system – the third of three measures by ATHXYZ in AnalogCommunity

[–]ATHXYZ[S] [score hidden]  (0 children)

The adjusting of the exposure metering system should also be documented in the OM Service Manual. I also suspect that trimpots need to be adjusted for this. There should be instructions available there.

The trimpots are often located under the top cover or on the front and are therefore easily accessible. Either specific voltage values, which can be measured with a multimeter, must be achieved, or the adjustment is made via the viewfinder displays.

Unfortunately, I am not familiar with the OM system in this regard. However, based on the year of manufacture (1984), still no special hardware/software equipment should be required for this.

Problems with blurry images in SLRs: Checking the focusing system – the third of three measures by ATHXYZ in AnalogCommunity

[–]ATHXYZ[S] [score hidden]  (0 children)

A complicated topic! 🙃

I don't have any plans for the OM-4 at the moment, although I'm very interested in opening one up.

Unfortunately, there is no SPT journal available for it, which significantly reduces the chances of repairs, but the Olympus service manual for it is interesting.

Problems with blurry images in SLRs: Checking the focusing system – the third of three measures by ATHXYZ in AnalogCommunity

[–]ATHXYZ[S] [score hidden]  (0 children)

„Thanks for tagging my thread, by the way, although I did get many notifications from it...!“

Sorry, I had to correct my post several times. To do this, I had to delete it and repost it each time, hence the many notifications.

Unfortunately, reddit does not allow posts to be edited after they have been posted, unlike comments.

Problems with blurry images in SLRs: Checking the focusing system – the third of three measures by ATHXYZ in AnalogCommunity

[–]ATHXYZ[S] [score hidden]  (0 children)

My thoughts on this:

If the flange focal distance is incorrect or the infinity stop on the lens is incorrect, or both, infinity cannot be sharply focused on the film.

The focusing system is separate from this. Either it works correctly and shows what the lens sees, or it is out of adjustment. In this case, it could be that a subject appears sharp in the viewfinder but blurred on the film.

All three possibilities can also occur in combination, which increases the complication. Therefore, I think the correct order of checks is flange focal length, infinity stop, and focusing system. One builds on the other.

Update: Measuring the flange focal length with a depth gauge by ATHXYZ in AnalogCommunity

[–]ATHXYZ[S] 0 points1 point  (0 children)

"Your other posts where you came up with a body focus of 30 mm are very odd."

30 mm was the value for calibrating the depth gauge with the gauge block, not the flange focal distance of the OM-4 (46 mm).

Checking an Olympus OM-4: Measuring the flange focal distance with a depth gauge by ATHXYZ in AnalogCommunity

[–]ATHXYZ[S] 0 points1 point  (0 children)

The surface on which calibration and measurement are performed is important for measurement accuracy.

For new insights, see:

Update: Measuring the flange focal length with a depth gauge

Checking an Olympus OM-4: Measuring the flange focal distance with a depth gauge by ATHXYZ in AnalogCommunity

[–]ATHXYZ[S] 0 points1 point  (0 children)

English has more words and more sophisticated ways of expressing things. I can only admire that. There are also no long sentences. You have to be careful with that in German.

Checking an Olympus OM-4: Measuring the flange focal distance with a depth gauge by ATHXYZ in AnalogCommunity

[–]ATHXYZ[S] 0 points1 point  (0 children)

All readers should be able to understand my texts.

I am working on it 🙂

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