Fishing for opinions on lenses

Discussion in 'Digital SLR' started by Petros, Dec 6, 2004.

  1. Petros

    Petros Guest

    I will be doing a good bit of photographing scale models for print
    (offset). What I'm hoping you can help me with is to give me some ideas
    on what kind of prime lens would work best for this. I've got a Sigma
    SD 9, so Sigma is the limit here, but I'm willing to invest in a EX
    grade lens. Examples (not the greatest) of what I'll be doing can be
    seen in the M16, L.R.D.G. and Chevy galleries on my web site
    (www.petros.pl). I've been looking at the 20mm f1.8 EX Asp RF which
    goes for around $370 but I can't find any close up shots done with this
    lens to check distortion. OTOH I've read on some modeling sites that a
    50mm prime is good for this kind of work, but that was in reference to
    a full frame 35mm body...

    Anyway, I don't have access to a store with Sigma lenses for Sigma
    bodies to try any of them out, and I need some experienced advice. I
    will be indebted! Thanks
     
    Petros, Dec 6, 2004
    #1
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  2. Petros

    Alan Browne Guest

    For scale models, I would expect that photographing fine detail would be an
    asset, and therefore a lens with macro capability would be necessary. A 50mm
    macro will come out as a 87mm with the Sigma sensor which is reasonable for
    macro work as well as full scale. (You didn't say how big the work is).

    Photodo ratings. B&H prices
    Grade: 4.2 35mm/AF Sigma AF 50/2,8 EX Macro (US$249)
    Grade: 4.2 35mm/AF Sigma AF 90/2,8 Makro discontinued
    Grade: 4.1 35mm/AF Sigma AF 105/2,8 EX Macro (US$369)

    While these are not the sharpest numbers for prime/macros, they are
    decent.http://www.photodo.com/pix/lens/mtf/SIAF9028MACR.gif for the 90mm
    indicates a well behaved lens. The shallow DOF may make scale model work very hard.

    http://www.photodo.com/pix/lens/mtf/SIAF5028EXMAKRO.gif 50mm is not bad either
    closed down, but rolls to softness rather quick wide open.

    I'm not sure what 'newer' lenses Sigma have that might be better.

    A 20mm used close up will produce a lot of perspective and distortion problems.
    If you can keep it centered, level and flat to the work, it won't be so bad,
    but that probably doesn't make for the photos you're looking for
     
    Alan Browne, Dec 6, 2004
    #2
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  3. Petros

    Petros Guest

    Alan Browne posted:
    Wow! You've given me a lot of helpful information. Than you!
     
    Petros, Dec 6, 2004
    #3
  4. Petros

    Skip M Guest

    Like Alan, I think you're best off with the 50mm f2.8 macro. Any thing
    wider, and you may run into distortion problems, anything longer, you may
    find yourself across the room trying to get the image framed right in what
    is acting like a 153mm lens instead of the 90mm you thought you had...<G>
     
    Skip M, Dec 7, 2004
    #4
  5. Petros

    Colm Guest

    I third that. I find the Sigma 50mm macro is just right for still macro
    subjects on my 10D.
    Stop it down to f45 if you want to see how much dust is on your sensor :)
     
    Colm, Dec 7, 2004
    #5
  6. Petros

    Petros Guest

    Colm posted:
    Three votes for the 50 mm. I'm convinced :)

    And I like the fact that it's cheaper, too! I'm assuming that the tests
    here and on photozone.de are referring to the new 50mm, the EX DG...
     
    Petros, Dec 7, 2004
    #6
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