New lens MP-E 65mm
Finally broke down and bought this bad boy. Still learning how to use it.
My first impression is that it is very difficult to use. Instead of a focal length adjustment the barrel length determines the level of magnification for the image (1x-5x). You focus by adjusting your distance to the subject - which essentially means you need to have focus rails to use this lens. The depth of field is VERY VERY shallow and this means unless you intend to use this for the "thats what the skin of an acro/euphyllia/whatever looks like" type magnification shots you will have to focus stack to have any meaningful composition. This brings you to another problem - because of the magnification effect - the blur on the out of focus portion of the shots are very prominent. This means that the auto-align feature in photoshop won't work. This essentially means layering the shots over yourself, do a blend and then manually taking out the blur and you will probably have to re-define the masks in the layers in a stacked shot. This means hours of work for one shot (or perhaps focus stack oriented software might solve this problem.)
Another problem is the working distance - its very minimal - your subject needs to be very close to the aquarium glass to get a focused shot.
The other problem is getting enough light on the subject. The lens is advertised as a f/2.8 at 1x but it isn't (there are lots of articles explaining this) - its more like a 5.6. At higher mag - this gets worse. So you end up shooting at high ISO. BUT because of the magnification the distortion from the ISO (even for a 6d) is very pronounced. I am going to try using flash to mitigate this for my next set of shots but setting up the shot will be tricky because of the limited working distance.
Here are some shots using the lens out of the box. I'm still getting the hang of it.
Close up of a cool australian mushroom leather
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Focus stacked tip of an efflo
stackedacro
Frogspawn Euphyllia
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Rainbow Torch
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Gold Hammers
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Low light close up of a gorgonian polyp
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This shot shows how shallow the depth of field is. I think this shot is at about 2-3x magnification on a single gorgonian polyp. Yet, i cannot bring the entire polyp into focus.
If anyone has this lens - feel free to share your thoughts.