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Rating: 
Summary: Amazing lens, amazing fun!
Review: I got this lens a couple years ago and use it extensively. It is well constructed and easy to use with any Canon EOS body, though it must be focused manually. This is the only tool I know of that enables easy *field* photography above 2x magnification. I have stalked the tiniest insects and peered into the hearts of flowers with this astounding lens, and my transparencies are crisp and clean every time. It comes with a tripod ring (same one as several other Canon lenses use, just in black), which greatly aids switching to a vertical format without having to reposition everything. Buy the MR-14EX ring flash with this, as it is impossible to see *anything* in normal daylight conditions at 5x. Its focus lamps frequently help in obtaining sharp pictures, though even they can't provide enough light to help you much when the lens is stopped down. A focus rail is also helpful--I use the Velbon macro slider since it moves in two directions, not just one. Tripod use is essential, as 5x magnification only covers an area about 5mm by 7mm. The biggest advantage to owning this lens is that I travel less to do photography--I spent several hours on my patio this winter photographing white flies, moss, spiders, and anything else that visited the potted plants there. Plunk down in a field and *stay there* a while, and you'll start to notice the small things around you.
Rating:
Summary: Amazing lens, amazing fun!
Review: I got this lens a couple years ago and use it extensively. It is well constructed and easy to use with any Canon EOS body, though it must be focused manually. This is the only tool I know of that enables easy *field* photography above 2x magnification. I have stalked the tiniest insects and peered into the hearts of flowers with this astounding lens, and my transparencies are crisp and clean every time. It comes with a tripod ring (same one as several other Canon lenses use, just in black), which greatly aids switching to a vertical format without having to reposition everything. Buy the MR-14EX ring flash with this, as it is impossible to see *anything* in normal daylight conditions at 5x. Its focus lamps frequently help in obtaining sharp pictures, though even they can't provide enough light to help you much when the lens is stopped down. A focus rail is also helpful--I use the Velbon macro slider since it moves in two directions, not just one. Tripod use is essential, as 5x magnification only covers an area about 5mm by 7mm. The biggest advantage to owning this lens is that I travel less to do photography--I spent several hours on my patio this winter photographing white flies, moss, spiders, and anything else that visited the potted plants there. Plunk down in a field and *stay there* a while, and you'll start to notice the small things around you.
Rating:
Summary: Absolutely Fabulous
Review: I mainly use this lens inside the studio, so I use studio lights to control the lighting of a subject. The higher the magnification, the more lighting is needed.
I use a tripod to photograph and either move the subject in focus, or change the magnification from the magnification ring of the lens. I set the aperture to f/16 (smallest aperture for this lens) to make sure I get maximum depth of field and sharpest result.
The magnification mechanism works by increasing the distance between the glass and the film/sensor. So if you move the magnification ring fast enough, you can feel some air flowing, just like the bellows. I used this lens on a Canon EOS 10D and forgot to clean the shutter chamber from dust, the magnification movement from 5:1 to 1:1 pushed some of the dust particles on the sensor, so make sure you clean the chamber.
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