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Crop guides for focusing screen


danny_spry

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Just out of curiosity, has anyone come across a solution for placing

crop marks for 5x7 or 8x10 on the focusing screen of an EOS Camera.

This is done all the time for Medium & Large format cameras using 4x5

film protectors but I haven't seen it done for 35mm.

 

Thanks

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Sounds like an excellent way to make your screen look extremely ugly. You'll have to live with that visual zit every time you peer through your camera. I just make a mental note of the approximate proportions,it's easy: imagine about 10% sliced off each end when held in the horizontal position. The A2, 600 series and 1 series have grid screens that may help you get your bearings if imagination isn't reliable enough. I keep grid screens in my A2 and FE bodies.

Sometimes the light’s all shining on me. Other times I can barely see.

- Robert Hunter

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How did you come up with the crop mark deminsions? And since you have taken the focusing screen off do you think it is possible to use a piece of acetate with crop marks on it and place it on the screen and held in place by the prism?

 

Thanks

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35mm film does not crop, full frame, to 4x6, 5x7 or 8x10 so cropmarks for me would be a handy way to make sure my images are composed in a way that will fit in these ratios. Or any othe special ratio that may be reguired from job to job.
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Danny where to put the crop marks was a problem, a lot of trial/error until I gave it some serious thought over a couple Heinekens.<p>All the cameras I did this to had removable focusing screens. I popped out the screen, cut a piece of unexposed film the exact size. (I have machining experience). Then I cut it's long side down to the sum of the width divided by four times 5 (w/4 x 5) e.g. if the width was 1 inch I divided that by 4 to get .25 inch. Then multiplied that by 5 to get a total length of 1.25 inch. That gave me a correctly sized stencil that I could move to where I wanted it. (Centered, full left or full right). I decided to crop off the left side (that way I only had to draw one line, I�d have to draw two if I wanted to center the crop). I taped down the stencil and ran my pen down it using it's side as my straight edge. Worked very well. I marked the side of the screen facing the mirror/shutter.<p>I don�t know how a piece of acrylic would work. I believe that it would have to be on the side of the screen away from the mirror/shutter.<p>And if the screen does not pop out? Email me I have a theory I�d want to try before writing about it.
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using a clear piece of acetate, I could draw the cropmarks with a fine point sharpie. Placing that between the focusing screen and prism would give me what I need. Using a clear material would give me the ability to make crop marks for different output sizes visible through the view finder and still give mw the full 97% view the EOS 3 offers.

 

Does anybody know if this would interfear with the focusing point indication lighting?

 

On further thought, I just realized that I can use Illustrator (or PS) to make the crop guides I need and then print it out on tranparency media making everything nice and neat and very accurate. Oh, how fun!

 

Once I do this and test it out, I will be more than happy to share the file so anybody who wants to do this can use it.

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