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  #21  
Old 10th July 2020, 06:39 PM
Svend Svend is offline
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Quote:
Originally Posted by big paul View Post
hi svend i am thinking of getting a RZ focusing screen ,how did you take the metal frame of and how did you cut it down without scraching it ,if its easy i may have a go .
Hi Paul,

The metal frame is in two pieces -- the main frame which the screen recesses into, and then a thin metal retaining frame held down by little tabs on the main frame. Just bend all the little tabs up, pull out the retaining piece and remove the screens -- nuthin' to it.

I recall that this is a two-piece screen (I could be mistaken - it's been a while since I did this), so you may have to use only the fresnel part depending on thickness of the camera's original screen. My Rolleiflex GG screen was about the same thickness as the fresnel alone so I didn't use the other part.

To cut to size I used a mitre box and a hack saw. Crude, but it worked. To protect the fresnel especially, as well as the viewing side, I covered it completely with painter's tape, which came off without leaving sticky goo. Take a fine file to clean up the rough edges and you're good to go. Maybe a good idea to wear cotton gloves when handling it to avoid fingerprints and oil in the fresnel grooves.

Pro Tip: because you want the new screen to be centered, you probably will need to make 4 cuts (unless you're lucky and one of the dimensions matches the original screen). Cut equal amounts off each side so that the center of the circular fresnel pattern is centered in the camera viewfinder. Easy math to figure out how much to trim, or just lay the old screen centered on top of the taped-up new one and mark with a fine pencil.

I think you will like the Mamiya screen. It works brilliantly on my 1950s 3.5C -- nice and bright, and things just snap into focus.

Best of luck and let me know how it goes.
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  #22  
Old 10th July 2020, 08:42 PM
big paul big paul is offline
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thanks for the reply Svend ,it wont be any good then i need a one piece ,i will carry on using this one until the right one cheap turns up . ..i only bought the camera because it was going cheap and it is a cracking camera ,its a electronic hasselblad ,with the same make hasselblad lenses i mostly use my 645 autofocus cameras ,so i should not worrie about focusing really .i think i will have to stop buying things and start selling some instead .
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  #23  
Old 10th July 2020, 09:53 PM
Svend Svend is offline
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Hi Paul,
Not sure why 2-piece would be a problem. The second layer is just a clear sheet with no fresnel. It has no real function I think, except to provide some protection for the delicate fresnel. I just discarded it and kept the fresnel piece. That said, I will check the RZ screen tonight and get back to you to confirm 1-piece or 2.
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  #24  
Old 10th July 2020, 11:42 PM
Svend Svend is offline
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Paul, I just checked and it turns out I had a second RZ screen on hand, unmodified (the seller gave me two I guess). It is indeed a two-piece, with one layer of clear glass with grid lines and the second layer a plastic fresnel screen. I used only the latter piece, cut down, for my 3.5C. I discarded the glass piece. The plastic fresnel is quite thin.

Hope this helps...
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