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if I only slightly ranzoome it is still unproblematic, but then suddenly it comes abruptly and I don’t see any significant difference between different zoom settings.

That’s interesting and maybe keeps us on finding a mistake.

Please try the following:

Test 1:

Put the camera in P.

Then, in the case of pure zooming, observe the values of exposure time, aperture and ISO value calculated by the automatic exposure.

I suspect that in the sudden change in image brightness described by you, the values change abruptly?

Please post values (before – after) here.

Probably the aperture value changes and the exposure time goes high (explains the blurring)?

Test 2:

Set the camera to Mode A and change the aperture setting (without zoom).

Now the camera would have to react with an adaptation of time and/or ISO and the image brightness does not change (approximately).

Will the image be extremely brighter when changing the aperture setting?

If so, how about what aperture values?

Conclusion – my guess:

If both attempts show that the image is too bright at certain aperture values, I would suspect a defect in the aperture:

If the aperture does not (further) slip, although the automatic exposure device wants to close the aperture (further), the automatic exposure is based on incorrect conditions and lifts the exposure time – as a result, the image becomes too bright and possibly also shaved.

Solution:

Electronic or mechanical disturbances can be the cause of a non-functioning diaphragm.

Rather repair probably not possible and can be repaired presumably unprofitable.

But maybe a Quick&Dirty solution helps:

Maybe only one mechanical component of the diaphragm is hooked (cut tight).

With a concentrated impact (camera knock on hard table surface, remove battery beforehand) it is possible to loosen the mechanical block with the resulting shock waves (optionally try different directions and impact strengths).

Sounds rabiat, but if the camera is otherwise anyway for the garbage you have to lose nix…

The question is whether it is a hardware problem or whether it is a software problem.

• Hardware problem e.g. with regard to closure, aperture, sensor
• Software problem e.g. wrong or wrongly set exposure program

My advice is to make several attempts:

• Exposure correction (usually found under an option EV +/- or so) with 0, highest plus value and highest minus value.
• Try the different programs (time preselection, screen preselection, ISO preselection) with extreme values (mal largest value and sometimes smallest value).

If you don’t get darker no matter what you’ve set, there’s a hardware defect.

If you were able to prevent overexposure with certain (extreme) values, please post here the settings that led to the improvement – then I can possibly give you a concrete conclusion.

P.S.: Please post sample images!