Rodenstock Rodagon 40/4 WA & SK Componon 40/4 WA

Rodenstock rodagon series have preset for aperture mechanism which can be set on certain aperture minimum (like Meyer preset), plus switch to change between click or smooth aperture transition.

Schneider Kreuznach componon has preset lever to switch from desired aperture to fully open aperture (like Helios 44-3 or Tair 11A preset), only click aperture no smooth option.

I cannot directly compare these two enlarger lenses because both have different back focus flange. Rodagon is shorter so that I cannot use same helicoid set up with Componon. I have to add m42 extension tube (thinnest) for Componon maximum use.

Rodagon

Rodagon crop

componon crop

Componon

 Shot comparison in sun light isn't good to judge color, tone, speed etc. Because in seconds light environment changed, so ignore these, I just wanna know how their sharpness at wide open.

Componon

Componon                                                                                Rodagon

Rodagon

My conclusion, Rodagon has better sharpness at wide open, however it has significant difraction at smallest aperture, f22, while Componon has less difraction.

At other aperture opening they perform similar except Componon has almost 5 star shape at f5,6 while Rodagon shaped pentagram. I will show you later.

Out of Focus

Inspired by many friends, and situation in my country which is not clear, corrupted!

Kern-Paillard Yvar 75/2,8 AR

This lens is from Bolex cine camera.
It has C mount mount.
Common character of this C mount type lens is sharp at center only when it's being used in digital camera, APSC or m4/3. edges will get swirled and very soft.
It doesn't happen with this lens.
This image below shows on left side still has detail.

Bokeh type is not so special, but looks good for a f2,8 maximum aperture lens.

The lens has some fungus and haze
So I must avoid strong light

I think it's nice for portrait lens.