Hassy 120mm lens/prism viewfinder question

Discussion in 'Medium Format & Large Format' started by nickTheCut, Feb 5, 2018.

  1. nickTheCut

    nickTheCut TPF Noob!

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    Hey guys. I’m trying to understand what is happening here. What I’m trying to do is have very intensional composition and have little to no need to crop my negative. What is happening is I compose my shot and the image comes back with more boarder than wanted.
    Here is a picture through my prism on a tripod at infinity IMG_2460.JPG
    Here is a picture through the prism focused on the railing IMG_2461.JPG
    Here is a pictures of the images I got after developing it. IMG_2466.JPG

    Please help me understand how I can correct this issue so my images come back just as I view it through the prism.


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  2. Dave Colangelo

    Dave Colangelo No longer a newbie, moving up!

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    There are a few things that could be happening here but the various Hassy's worked a bit differently so to help us answer,

    What camera are you using? (specific model)
    What Prism are you using?
    What film back are you using (I presume its an A-12)?

    If you are unsure of what exactly you have or dont know what to call it check out this site for a solid reference point.
     
    Last edited: Feb 5, 2018
  3. nickTheCut

    nickTheCut TPF Noob!

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    Hey THANKS

    Hasselblad 500c/m
    Marko Planar 120mm CF T
    PM 5 prism
    A12 back
    IMG_2478.JPG




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  4. Dave Colangelo

    Dave Colangelo No longer a newbie, moving up!

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    Excellent, we have almost an identical setup the only difference being Im running the 150 CFT.

    The first thing I would check is that there is no Diopter correction lens installed on the PM-5. this may be causing you an issue if you also have glasses or do/dont need diopter correction. I would not think it would cause such a disturbance but it might (maybe someone installed an improper one that happened to fit).

    I did some research on the 120mm Makro and it looks like there maybe some internal differences with that lens since its also a macro lens. I looked over the PM5 manual and cant find any reference to any lens limitations or finder/film variants. Similarly the Makro data sheet does not mention any limitations either. It is possible that this particular lens/finder combo creates some kind of edge issue as a result of its macro design and the finders 3x zoom.

    There is an interesting discussion on the topic here one guy quotes "The Hasselblad Manual" By Ernst Wildi and offers some numbers suggesting that the various finders do cause crop issues in the ~8% range. I don't have the book so I can't confirm (but its not on my "obscure hasselblad stuff to obtain" list)

    Im going to be running some rolls on my 150mm soon for another reason, Ill run some shots with my PM5 and take notes on them and see if I notice a similar crop ill be honest I have not paid super close attention to this yet so its possible its been happening to me the whole time.
     
  5. nickTheCut

    nickTheCut TPF Noob!

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    I’ll look into that discussion you referenced, TJ’s k you. My thoughts have been that the pm5’s 3x magnification had something to do with it. I also had similar results with a PME Metered finder, so I don’t believe it has anything to do with my current prism being the problem. I’ll look into the 120mm info.


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  6. nickTheCut

    nickTheCut TPF Noob!

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    I’ll look into that discussion you referenced, thank you. My thoughts have been that the pm5’s 3x magnification had something to do with it. I also had similar results with a PME Metered finder, so I don’t believe it has anything to do with my current prism being the problem. I’ll look into the 120mm info. I’d love to hear how your PM5 & 150mm combo is working together. That’s the other lens that intrigues me, but really enjoying this 120 focal length :)

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    Last edited: Feb 5, 2018
  7. Derrel

    Derrel Mr. Rain Cloud

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    That's a HUGE difference! Not just a little, but a HUGE amount more on-film. Do you have some type of slide mask installed?
     
  8. Dave Colangelo

    Dave Colangelo No longer a newbie, moving up!

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    Ill be posting some stuff in the coming months on it hopefully. I have a project shaping up that I plan to put it to work on. I used the lens pretty heavily on a portrait/engagement shoot recently with the waist level finder and really liked it. I currently have the 50mm, 80mm, 150mm, 250mm and a 500mm. The 150 sits in a really sweet spot that I find I like for all around use.
     
  9. nickTheCut

    nickTheCut TPF Noob!

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    I’m new to Hasselblad and this setup. I think you are onto something!
    Here is what’s under my focusing screen. IMG_2485.JPG



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  10. Derrel

    Derrel Mr. Rain Cloud

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    Yeah...I thought so, just by looking at the view and then the actual image...

    That has indeed been masked off!

    Look into using an A16-series magazine, perhaps?

    Hasselblad A16: Film Photography | eBay
     
  11. Dave Colangelo

    Dave Colangelo No longer a newbie, moving up!

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    That's it indeed get rid of that!

    Dave
     
  12. nickTheCut

    nickTheCut TPF Noob!

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    Great eye! Look what was under the viewing screen IMG_2491.JPG

    It looks as though it’s masked off for 6x4.5, but has a clear square to frame 6x6 images. Problem with this is the composition if you want to utilize maximum amount of film plane.


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