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  1. #71
    Ken Nadvornick's Avatar
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    Quote Originally Posted by David Brown View Post
    I've tested my 0C filters and they passed. This is the bottom line about the absolute need for testing - it accounts for other variables.
    While this is undoubtedly true, in isolation it can only give the tester a binary result. Either the safelight is safe within the parameters tested, or it is not. It says nothing regarding why the safelight may not be safe. And more importantly, if the reason the safelight is unsafe might be an easily and inexpensively correctable flaw.

    The case in point is, again, those expensive Thomas Duplex units. How many darkroom workers have in frustration replaced this unit with another different expensive unit because "it's too bright and it fogs my paper," when a quick visual check with a CD would have shown the real reason it was fogging paper had nothing to do with brightness? And that a $6.49 sheet of Roscoe theatrical filter would solve the problem without the need to junk the entire unit?

    It's not that testing isn't the final word, it's that more information is always better.

    Ken
    "There is very limited audience for the arty stuff, and it is largely comprised of other arty types, most of whom have no money to spend because no one is buying their stuff either. More people bring their emotions to an image than bring their intellect. The former are the folks who have checkbooks because they are engineers, accountants, and bankers—and generally they are engineers, accountants and bankers because they are not artists."

    — Amanda Tomlin, Looking Glass Magazine, 2014

  2. #72

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    Quote Originally Posted by Ken Nadvornick View Post
    While this is undoubtedly true, in isolation it can only give the tester a binary result. Either the safelight is safe within the parameters tested, or it is not. It says nothing regarding why the safelight may not be safe. And more importantly, if the reason the safelight is unsafe might be an easily and inexpensively correctable flaw.

    ... It's not that testing isn't the final word, it's that more information is always better.

    Ken
    Ken: I agree.

    If a safelight tests "safe", fine. However, if there's a failure, there could be any number of reasons why. 0C filters can fail, for instance, because they have faded to the point of being ineffective, or they may not be suitable for the paper in question, or it may be something else. It is entirely possible that a safelight test can fail when the safelight itself is OK, but there was stray light from the enlarger, or even another source that was not accounted for.

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