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It's a fixed focus lens ?
Nothing compared to your stuff.
Yes it is fixed focus.
The shots above are all at 3:1 which means I have to attach the 1x & 2x auxiliary lenses and be exactly 2.83in from the subject. If I wanted to do 2:1 I'd have to attach the 2x auxiliary lens and be 4.25in from the subject.
It's almost like the MP-E except there is no zoom, instead there are 6 auxiliary lenses (diopters) and a built in ring flash. It's very challenging on moving subjects. This lens was originally for dental work.
Also my shutter speed MUST be at 1/250 (Flash Sync) and my ISO MUST be at 100 ISO in order for the built in ring flash to properly expose the image for 3:1. This is all calculated on the lens which also sets my aperture to f/45 for that combination.
On another note I realize my sensor needs a cleaning but the D3 is a dust magnet and at f/45 and being that close to the dirt, it's going to be dirty.