beseler 45MX condenser bellows vs focus bellows

[esearing]

On the 45MX there are two bellows - one between the negative stage and the light source (head), the other is below the negative stage for focus. Is there a purpose to raise or lower the distance between the light source and the negative? I have always left it so the light is closest to the negative (collapsed). I am thinking it may have to do with single point bulb heads vs a diffused light source.

[Paul Ron]

the condenser bellows is to adjust the light coverage for different formats. the one under the neg is for focusing the image. get the manual, it explains it.

btw my condenser bellows has a scale on the right side with the formats so you have an idea where you are...

with no neg, raise the head to your desired image size, then see if it has an even light in your frame. as you move the condenser bellows up n down you will notice the light will clip the corners.

[esearing]

Interesting - my Ilford head comes with different diffusion boxes for different formats so I have never needed to adjust the light source bellows. Good to know about the corner clipping aspect, that may be why I leave the bellows collapsed. Also the negative carriers have smaller openings for different formats so not sure it would matter since you are using the center area of the light source.

[Graham Patterson]

Beseler diffusion heads are run with the upper bellows collapsed to get the light surface as close to the negative as possible. Swapping the internal diffusion box in heads like the 45s can optimize the light for the format, but I have to admit I tend to leave it as 4x5 unless i am doing 35mm. It still runs with the upper bellows collapsed.

With the condenser head, the upper stage needs to be adjusted so that the negative is fully illuminated - collapsed for 4x5, and fully extended for 35mm. It can be done by eye if the scale is not fitted.

[ic-racer]

On the 45MX there are two bellows - one between the negative stage and the light source (head), the other is below the negative stage for focus. Is there a purpose to raise or lower the distance between the light source and the negative? I have always left it so the light is closest to the negative (collapsed). I am thinking it may have to do with single point bulb heads vs a diffused light source.

Do you have the manual?

[Doremus Scudder]

Just to clarify: If you are using the condenser light source, you need to adjust the upper bellows to the right height for the size of negative you are enlarging. Originally, the enlargers equipped with condenser heads had a scale marked by negative format as a guide (35mm, 6x6, 6x9, etc.). You'd set the bellows using that.

If you are using a color head or a cold-light head, the upper bellows need to be completely collapsed to get the diffusing screen as close to the negative as possible. That goes for all Beseler color heads and after-market diffusion/cold-light heads of any brand.

Best,

Doremus

[esearing]

Just to clarify: If you are using the condenser light source, you need to adjust the upper bellows to the right height for the size of negative you are enlarging. Originally, the enlargers equipped with condenser heads had a scale marked by negative format as a guide (35mm, 6x6, 6x9, etc.). You'd set the bellows using that.

If you are using a color head or a cold-light head, the upper bellows need to be completely collapsed to get the diffusing screen as close to the negative as possible. That goes for all Beseler color heads and after-market diffusion/cold-light heads of any brand.

Best,

Doremus

Thanks - that gives the detail I was looking for. IN addition to the corner clipping advice above.

[monochromeFan]

Just to clarify: If you are using the condenser light source, you need to adjust the upper bellows to the right height for the size of negative you are enlarging. Originally, the enlargers equipped with condenser heads had a scale marked by negative format as a guide (35mm, 6x6, 6x9, etc.). You'd set the bellows using that.

If you are using a color head or a cold-light head, the upper bellows need to be completely collapsed to get the diffusing screen as close to the negative as possible. That goes for all Beseler color heads and after-market diffusion/cold-light heads of any brand.

Best,

Doremus

Is this general rule of thumb take everything into consideration? Likea 23cII being run with a dichroic color head set to condenser mode?

And does it take lens to film format into consideration?

[H Gloriant]

My 45MX enlarger restoration https://35mm-compact.com/forum/viewtopic.php?t=63585

[Doremus Scudder]

Is this general rule of thumb take everything into consideration? Like a 23cII being run with a dichroic color head set to condenser mode?

And does it take lens to film format into consideration?

Not sure what you mean by the question. I posted information specific to Beseler 45M... series condenser enlargers regarding positioning of the upper bellows. Nothing whatsoever to do with the 23C or dichroic heads in any mode.

Best,

Doremus