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PostPosted: Wed Dec 28, 2011 2:12 pm 
I'm keen to experiment a bit with 'macro'. I was thinking that i'm not ready to take the plunge with a dedicated macro lens so was thinking of buying an extension tube. This would also fit with a travel camera set up.

Of my lenses (see sig) which would work best with a macro tube? Ideally the sigma 30mm because I'm loving the lens and have it with me a lot

At the moment the closest the 30mm lens will focus is about 400mm which is not close enough for some of the shots I've been wanting to get

Any top tips, handy hints and websites worth a look for advice and inspiration gratefully received


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PostPosted: Wed Dec 28, 2011 3:09 pm 
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Joined: Sun May 25, 2008 12:48 pm
Posts: 8087
Location: UK
Shorter focal lengths work best, in the sense of closer focus and more magnification with extension, so the 30mm should be interesting to try. The 50mm should be fine too.

I'd suggest a cheap set off ebay, with electrical contacts so you retain aperture control.

As you add more extension to the lens, the closer you focus. Like macro, the depth of field will drop rapidly so you'll have to juggle small apertures, enough light, hitting diffraction softening and showing up all the dust on your sensor! Also the lens will behave differently as you are pushing it outside its design limits. Stopping down does help. For example, on the 50mm f/1.8 you get field curvature and a glow if used wide open, which cleans up nicely or is masked when stopped down to f/5.6 or more.

If subjects allow, I find using a tripod optionally with macro rails to be a nice way to work around the chronic light fall off. Alternatively if you do hand hold, get your flash skills on standby.

See also here for an example of what extension tubes do with the 50mm f/1.8.

Canon DSLRs: 7D2, 7D1, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 85/1.8, 135/2+SF, 70-300L, 100-400L, 100L, MP-E 65, EF-S 10-18, 15-85
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 50/1.4A, 150 macro, 120-300 f/2.8 OS
Compacts: Sony HX9V, Fuji X100.

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