Tele Macro
A look at what is currently available on eBay
 Tamron 159A 28 mm - 70 mm F/3.5-4.5 Lens Tele-Macro US $.99 
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 Tamron CF Tele Macro 35-135mm Lens US $5.99
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 SIGMA Tele-Macro 2X Converter / Extension Tube for Pentax US $58.50
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How good is 'Sigma APO 70-300mm DG MACRO' lens for macro photography?
Sigma APO 70-300mm DG MACRO is said to be having a Tele-macro mechanism which allows macro photography. how good is its macro shots? is there any point fixing a macro close up lens for it?
Whether a lens is 'Macro' or not is determined by how close it can focus. The Sigma 70 - 300mm is not a true Macro, these can focus so the subject is projected onto your sensor life size (something that is 1cm in the real world will be 1cm on your sensor - a 1:1 ratio). The Sigma lens won't do that, but it will focus close enough to give you around a 1/4 life-size image, which is a lot closer than most telephoto lenses allow.
The Sigma lens only does this 1/4 life-size view at the 300mm end of it's range, which will put you several feet from your subject, when you magnify in this way movement is magnified too, so camera shake is a real problem. Add to that the small aperture you need to get any kind of useful Depth of Field, and the fact that you only have a small area reflecting light into your lens, shutter times will be long, hand holding is virtually impossible with this lens. The last two points apply to any macro type lens.
The lens is a good telephoto without this close focusing function, think of it as a bonus rather than buying this lens for it's 'Macro' ability. It punches far above it's price with it's image quality which is very good for a lens in this price range.
Close up lenses will enable any lens to focus closer and would work with this lens too.
Chris
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September 23rd, 2005 in
Uncategorized | tags: camera, lens, macro, photography, sigma, tamron cf tele macro, tamron tele macro, tele macro, tele macro function, tele macro lens, tele macro monarch, tele macro photography, tele macro sony