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Showing posts from July, 2008

Using a DSLR as a Shutter-Tester

What good is a DSLR if you can't test the shutter of your Holga with it? Ok, I'm kidding, but there is a fairly simple way to use a DSLR as a shutter speed tester for any lens that has a leaf shutter. In fact, with a little care, this method can be used to test practically any shutter. Don't expect pinpoint accuracy or rush to put your lab equipment on eBay, but this method should be accurate to within at least a third of a stop - certainly good enough for average everyday use.

Think for a moment what a shutter does. It is simply a way to block the path of light falling on the film/sensor and then to remove that blockage for a certain known amount of time to let light fall on the film/sensor. It's a pretty simple concept really - a mechanized and repeatable version of the old hat-on-lens technique. Problem is, shutter speeds go off - they slow down, they speed up and do all sorts of funny things. Often, as in the case of mechanical marvels like the Holga, they are simpl…