Traditional boxy cameras - RB/RZ, Hasselblad 500's - focus adjustment?

Started 2 months ago | Discussions thread
JimKasson
JimKasson Forum Pro • Posts: 27,854
Re: Traditional boxy cameras - RB/RZ, Hasselblad 500's - focus adjustment?

Raymond Cho wrote:

Hi, not referring to digital back exactly but a related question. For those of you who had gotten a digital back for the boxy type medium format cameras did you have to get your focus screen calibrated?

The reason I ask is that I have a RB67 and also a Hasselblad 500CM but both of them are very sharp at f11 doing a landscape but they are not so sharp when doing a portrait on a tripod at a moderate F5.6 or something. Could it be that I am overly picky and it's film photography or maybe it needs calibration?

It's pretty easy to see if you're back is in the same optical plane as your finder. Focus on a Siemens Star. Take a picture, Check sharpness in the raw file. If you use a focus alignment ramp, you can see how far off you are an in what direction.

https://www.amazon.com/LensAlign-MkII-Focus-Calibration-System/dp/B004G3PANY

Oops. I see you're using film. Try the above, but the cycle time will be much longer. In addition, look for signs of lack of film plane flatness.

Jim

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