danny_spry Posted June 20, 2003 Share Posted June 20, 2003 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 Link to comment Share on other sites More sharing options...
preston_merchant Posted June 20, 2003 Share Posted June 20, 2003 Focusing screens can usually be "scored" (etched) by someone who knows what he's doing. It would seem odd to place marks for enlargement purposes--the frame is the frame. Most EOS cameras offer less than 100% coverage. Where would the marks go? Link to comment Share on other sites More sharing options...
ron c sunshine coast,qld,a Posted June 20, 2003 Share Posted June 20, 2003 My brother scratched some grid lines on his rebel screen with a razor.They are permanant of course(for that screen anyway),but look quite good. Link to comment Share on other sites More sharing options...
jimvanson Posted June 20, 2003 Share Posted June 20, 2003 I used an ultra fine technical drawing (drafting) pen filled with permanent ink that draws on glass/plastic. An ultra fine sharpie type would also work. Get them from an art supply store. Link to comment Share on other sites More sharing options...
PuppyDigs Posted June 20, 2003 Share Posted June 20, 2003 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 Link to comment Share on other sites More sharing options...
danny_spry Posted June 21, 2003 Author Share Posted June 21, 2003 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 Link to comment Share on other sites More sharing options...
danny_spry Posted June 21, 2003 Author Share Posted June 21, 2003 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. Link to comment Share on other sites More sharing options...
jimvanson Posted June 21, 2003 Share Posted June 21, 2003 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. Link to comment Share on other sites More sharing options...
jimvanson Posted June 21, 2003 Share Posted June 21, 2003 Made a mistake in my above description. I actually marked the flat top side of the screen. That�s the side that sits facing the pentaprism not the side facing the film...sorry about that. Link to comment Share on other sites More sharing options...
danny_spry Posted June 21, 2003 Author Share Posted June 21, 2003 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. Link to comment Share on other sites More sharing options...
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