Sparky with double glass, starburst aperture, and wide/tele adapters.
This is a rambling note to myself in hopes that I remember how to use this lens. You have been warned! Enamored of the Lensbaby Spark, I've bought accessories, including tele and wide adapters, a double glass f/2.0 optic and the aperture creative kit. I inserted this optic and a starburst aperture and performed some initial tests. .6x wide adapter should make this a 30mm lens - the equivalent of a 45mm on my APS-C sensor. The sweet spot of the Lensbaby is correspondingly smaller. One can see a bit of the starburst aperture's effect on bokeh in the upper corner of this shot - it becomes more pronounced with higher contrast. For instance: This is purposefully unfocused to create a photo that is only bokeh - the trick to using this lense is to relegate everything to bokeh except a subject - the sharpness of the subject is created by that contrast rather than any optical clarity. With no adapter, the 50mm (75mm eq) f/2 double glass optic allows more light than the