AF fine tuning on Mamiya/PhaseOne cameras & focussing screens

[Christoph B.]

So today I finally got my 120mm (it really is as sharp as everyone says) and as my gear is now complete I wanted to fine tune my autofocus on the 645DF+.

Of course you can't tune the AF for each lens but I found that all my lenses were equally in point after the calibration, which leads me to believe that it's not necessary to do so.


Does anyone have a problem with the autofocus adjustment and different lenses?

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Second question:
As I also use the manual focus very frequently I was wondering whether the micro prism screen would help (especially in low light situations)  - and whether it could possibly interfere with any aspect of the camera, such as autofocus or metering or anything else.

[Christoph B.]

Hmm..really, no one?

I guess everyone already sold their 645DF and went straight to the XF system....   

[synn]

I use a DF+ and have not needed micro adjustment for my lenses.

[Christoph B.]

Alright - and have you ever thought about exchanging the focussing screen for one with a micro prism?

From what I've read it should improve MF but I'd really like to know from someone with hands on experience...

[Franzl]

I really enjoyed the micro prism screen. Can only recommend it.

[Christoph B.]

I really enjoyed the micro prism screen. Can only recommend it.

Did it interfere with any camera functions like autofocus?

[synn]

I have a microprism viewfinder for my bronica etrsi and enjoy using it a lot for manual focus. I would think the same would apply for the mamiya.

A focus screen will not affect how autofocus works.

[LasseDPF]

Recomended. Its very easy to swap should you feel the need to put the original screen back.


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[Paul2660]

If the screen is for the DF or DF+, I would add, it's easy to open the latch, but I find not so easy to close it.  Even with the tool Mamiya/Phase include with the screens.  I have changed out 35mm screens for years in Canon's, but on my DF, my latch never seemed to want to fully lock even though I could hear it click, and I would have issues with the screen dropping down on the mirror and jamming. 

Just be careful when making the change to assure that the latch has fully engaged. 

Paul C

[Christoph B.]

Thanks Paul, I'll do that!!

[Christoph B.]

So today I installed the screen - what a revelation!!!
Reminds me a bit of the screens in the Canon A1/AE-series cameras, really easy to get your focus on point and it's not really much darker.

I really wonder why they don't just ship the P1/Mamiya cameras with this screen installed, it's so much easier to focus, even on the sides!