robert_digrazia Posted June 14, 2018 Share Posted June 14, 2018 Using Epson V600 with BetterScanning variable-height negative holder, medium format To adjust the height of my negative holder, I wish to use a monochrome negative (black and transparent) with a test pattern that has sharp edges. Does anyone know where I can find such a negative? Link to comment Share on other sites More sharing options...
ben_hutcherson Posted June 14, 2018 Share Posted June 14, 2018 When I adjusted mine, I used a strip of Tri-X that had been developed in Rodinal and had well defined high contrast lines in the image. The grain is course enough that the V700(and presumably also the V600) can easily resolve it, and I used Rodinal because it gives well defined edges to the grain(solvent developers like D76 and HC110 soften the edges of the grain). The high contrast lines were used to confirm focus, but I mostly used the grain as a guide. When I print in the darkroom, I use a device called a "grain focuser" to focus the negative. This is basically a microscope that looks at a tiny portion of the image, and the enlarger is focused until the grain is visible through the microscope. It works with even fairly fine grain film, but focusing on the grain in a scanner is a good way to get things as sharp as possible. Link to comment Share on other sites More sharing options...
Jochen_S Posted June 14, 2018 Share Posted June 14, 2018 Do you have a connection to established printing industry (small offset shop or silkscreening)? If so, I'd recommend getting some old lithographic film from their trash and cutting it down. Link to comment Share on other sites More sharing options...
rodeo_joe1 Posted June 15, 2018 Share Posted June 15, 2018 Just use a piece of fogged and developed film and scratch a cross in the emulsion with a needle. Unless you're trying to measure the resolution, that'll be as good as anything else. Or as Ben suggested, use a grainy neg and use the grain to focus. Link to comment Share on other sites More sharing options...
diegobuono Posted June 29, 2018 Share Posted June 29, 2018 Hasselblad Focus Calibration Sheet for Flextight 646 H-40900026 It has very fine pattern that is not visible with the naked eyes looking at the image on the B&H web site. Link to comment Share on other sites More sharing options...
robert_digrazia Posted July 25, 2018 Author Share Posted July 25, 2018 Hasselblad Focus Calibration Sheet for Flextight 646 H-40900026 It has very fine pattern that is not visible with the naked eyes looking at the image on the B&H web site. At $32, a bit pricey, but it looks like what I need. Can I cut strips from this sheet to fit a medium-format film holder for the Epson V600? Link to comment Share on other sites More sharing options...
diegobuono Posted July 25, 2018 Share Posted July 25, 2018 No need to cut it, it is for medium format, it is of the same dimension of a 6x6 medium format picture. Link to comment Share on other sites More sharing options...
robert_digrazia Posted July 27, 2018 Author Share Posted July 27, 2018 No need to cut it, it is for medium format, it is of the same dimension of a 6x6 medium format picture. I bought one. It's 75 X 90 mm, (3 X 3.5 in). Time to apply scissors! On hasselbladrepair.com, there is a Focus Calibration Sheet described as 22.9 X 16.2 cm for 28 euros. Link to comment Share on other sites More sharing options...
diegobuono Posted July 27, 2018 Share Posted July 27, 2018 Mine is 6x6, it came with the scanner. Link to comment Share on other sites More sharing options...
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