Burn-in exposures are set in steps of 1/12th to 1/2 f-stop. Nine subsequent exposure times can be programmed, each calculated either relative to the base exposure or the total exposure time thus far.Coarse/fine button toggles between 1/24th and the set coarse time step. The coarse step size can be set to 1/2, 1/3, 1/4, 1/6 or 1/12 of a f-stop. The fine step size is 1/24th f-stop (approx 2%). All exposure times are set in coarse and fine steps of actual exposure rather than simple seconds, producing consistent changes on the paper.Base exposure time 1.0 seconds to 240 seconds, in steps of 1/24th to 1/2 f-stop (or of 0.1 or 1.0 seconds in linear time mode).It can also be used to compensate for the effects of toning. And if the base exposure is changed, the StopClock recalculates all the burn-in exposures to maintain the correct density relationships! A special compensation mode alters exposure times to allow for the effects of “dry-down”, the change in apparent print brightness as the paper dries. No times to remember, no fiddling with timer settings in the dark. The two channels make split-grade printing a breeze, and there’s even a special mode which effectively allows the exposure and contrast of variable contrast paper to be controlled separately. Using our F-Stop exposure system in conjunction with a built-in automatic test strip generator and ten exposure memories per channel, you can set up a complete printing sequence quickly and easily, often with reference to just a single test strip! Once the paper’s on the easel and the lights are switched off, making the print becomes a simple matter of pressing the start button and shading the relevant areas of the print. Two channel f-stop enlarger timer with dry-down compensation, 1/24th stop resolution and enhanced split-grade mode.Įasy to use if you’re beginning yet versatile and powerful enough for professional printers, the legendary StopClock Professional really will save you time and paper. Product videos on all the RH units are on the RH Designs YouTube channel.
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