I recently purchased the Sweet 35 optic for my Lensbaby Composer. Rather than using aperture rings like other Lensbaby optics, it has a built-in f-stop adjustment. It's still manual focus as you would expect for a selective focus lens but it can render very sharp images if you accurately focus it on your subject. The depth of field changes depending on the setting used of course. I often will focus with the lens set for F2.6 and then stop it down to gain a larger focus sweet spot. The classic lines of this Mercury 8 seemed to work well with this new lens.