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30mm macro?
I've seen the news that Sony has a 30mm macro lens either coming out or came out. But, I can't help but wonder, what would you use it for? To me, long the better, not wider! 
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Depends what format it's being made fore, Sony don't make film cameras, 30mm on the Sony SLR's would be the digital equivalent of a 50mm macro lens on 35mm.
Macro lenses come in various forms and it really depends what's being photographed, some are longer than a standard lens 80/90mm, others 50/60mm, while for more extreme close up they can be shorter still 28mm/40mm, any shorter and they tend to be called Micro lenses. I've used an 8mm Micro lens on a Pentax for scientific work.
Ian
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30mm on a full frame A900 would be 30mm, Ian....
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The shorter the focal length, the more magnification you get for any given length of extension. I use Zuiko 20 and 38mm on bellows, the working distance is very very small, but the magnification is very very high.
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 Originally Posted by wayne naughton
30mm on a full frame A900 would be 30mm, Ian....
This lens will be 30mm on the full frame A900, but will give you a round picture. It's an APS lens, just like there are Canon/Nikon lenses specifically for APS cameras. The equivalent to 135 is 45mm IIRC.
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Originally Posted by wayne naughton
30mm on a full frame A900 would be 30mm, Ian....
Only when the 30mm is designed for a full frame camera 
The APS version may still be usable on a full frame on extension tubes/bellows as coverage increases as the extension is increased.
Ian
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Whoops.... my mistake..... grin.
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No mistake.
A 30 mm is a 30 mm is a 30 mm. No matter how small or large the format, and not matter whether it fills that format or not.
Especially when macro is concerned, a lens' focal length matters more than an angle of view.
Try to do 1:1 with a 1200 mm lens. Very, very hard. No matter whether on APS or on 8x10".
Try to do 10:1 with a 30 mm lens. Easy! On APS, Full frame 35 mm format, MF, LF.
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Actually, slightly off topic, but thinking about the difference between APS-C and 35mm, has there ever been any APS-C (film) slr's made? If not, why not?
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Originally Posted by winjeel
Actually, slightly off topic, but thinking about the difference between APS-C and 35mm, has there ever been any APS-C (film) slr's made? If not, why not?
Yes there were several, but they never quite caught hold, partly I suspect because the full array of films available for 35 mm never made it to APS.
DaveT
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