there is always the possibility that a DSLR body might not support a (likely older) third party lens.

But in the end, the front element of this lens is so far recessed, I'm inclined to simply forego the hood altogether on this lens. This particular tree stump was rather large and required some effort to get indoors, but macro lenses and small subjects can mean small space requirements for shot setup. You can use a step up adapter ring to use a larger filter size on this lens (such as a Canon-common 67mm size), Your location and available space is not a limitation nor is the time of day (if using artificial lighting). The Sigma 105mm f/2.8 EX DG Macro Lens uses a not-nearly-as-nice as HSM or USM 2-step combination of a push/pull clutch and an AF/MF switch to select the desired focus mode -Spotting Scopes Swarovski Spotting Scopes Vortex Spotting Scopes Celestron Spotting Scopes Zeiss Spotting Scopes Eyepieces, Mounts, Cases and Accessories Telescopes Celestron Telescopes Telescope Eyepieces, Filters and Accessories Those comparison pictures show a lot – especially that the 50 is small when retracted and that the 180 is a big lens.

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The Sigma 105mm ƒ/2.8 EX DG OS HSM provides a very sharp image even wide open at ƒ/2.8, but for maximum sharpness you need to stop down to ƒ/5.6. There are traces of corner softness at ƒ/2.8, which settle down nicely at ƒ/4, and all but disappear at ƒ/5.6. Performance at ƒ/8 is more or less the same as ƒ/5.6 (though according to the numbers, just very slightly less sharp). Diffraction limiting sets in by ƒ/11, though you don't notice any practical impact on sharpness until ƒ/16, and even then, it's still very good. At ƒ/22 we begin to see some light softness across the frame. This lens is compatible with Sigma's APO Tele Converters. With APO Tele Converter 1.4x EX DG, it can be used as 147mm F4 AF* telephoto macro lens, and APO Tele Converter 2x EX DG as 210mm F5.6 MF telephoto macro lens. This allows a greater working distance while still achieving 1:1 macro magnification. *AF does not work from 0.45m close up photography.

Note that, as with all macro lenses, the effective aperture becomes narrower as very close macro focus distances come into use. The story here is that you are probably not going to make your 100mm-ish macro lens decision based on size. The Sigma 105mm ƒ/2.8 EX DG OS HSM produces no meaningful distortion whatsoever, on either the sub-frame 7D or full-frame Canon 1Ds mkIII. The owner's manual for this lens instructs that the OS switch should be in the off position when mounting/dismounting the lens. There are few subjects that a macro lens cannot be used for and the results you can get from a macro lens are only limited by your imagination.What can also be seen in the above photo are magnification markings on the extended portion of the lens barrel.