Help with enlarger light diffusion

I've recently purchased my first enlarger a month ago and i'm having a strange problem with light diffusion on the board.

It's a Meopta Opemus 5 with bw head (standard).

The problem comes when using the anaret lens for 35 mm negatives, the light on the right it's visibly less than the rest of the picture. I put the negative in the middle of the carrier and of course mount the lens in the concave of its plate.
To compensate this i have to expose 1/3 more on that area..

The strange thing is that i also use it with medium format Componon lens and the problem seems not to be there..

What could be the problem?

I've checked the condenser and it seems all in its place..

Please help!

it sounds as though something is not seated properly in the enlarger head.

However, if its only 35mm could it be the shutter in your camera is not working properly. Sticky first or second curtain in the shutter?

Can you see that fall off in your 35mm negs by eye? Scanning them may make it easier to see when increasing contrast of scanned image.

RobC said:

it sounds as though something is not seated properly in the enlarger head.

However, if its only 35mm could it be the shutter in your camera is not working properly. Sticky first or second curtain in the shutter?

Can you see that fall off in your 35mm negs by eye? Scanning them may make it easier to see when increasing contrast of scanned image.

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+1

Vitoret said:

I've recently purchased my first enlarger a month ago and i'm having a strange problem with light diffusion on the board.

It's a Meopta Opemus 5 with bw head (standard).
!

Click to expand...

I don't think the lamp is adjustable on that one. Are you sure the globe of the lamp is free from irregularity? Sometimes opal lamps form blackened areas on the globe and then need to be replaced prior to burnout.

If you make a print from 35 using the Componon? does it have the falloff? If it does perhaps the Anaret is misaligned.

I am not familiar with your enlarger, but if I had those symptoms in my enlarger, Beseler 23c, I would spin the negative carrier 180 degrees and see if the image is still light on the same side. It is either the negative--light side would rotate with the carrier--or it is the enlarger condenser if the light area doesn't move.

JeffreyR said:

I am not familiar with your enlarger, but if I had those symptoms in my enlarger, Beseler 23c, I would spin the negative carrier 180 degrees and see if the image is still light on the same side. It is either the negative--light side would rotate with the carrier--or it is the enlarger condenser if the light area doesn't move.

Click to expand...

Welcome to APUG

Ok, after some tests i've discovered the problem was the actual lamp. The metal luminescence part was forming a curved form almost like a "C" leaving the right part a lot less illuminated..
The diffusion glass in the filter carrier cannot diffuse this type of light enough to be equal

I've currently replaced the lamp with an led Ikea Lamp 75W which is working pretty good!

I think the best way to test for even enlarger light is get everything else out of the equation - IE the neg. Use an empty carrier and expose a sheet of paper for a middle gray tone - your particular enlarger/lens combo's falloff pattern will be very obvious in the print.