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07/19/2005 10:38:04 AM · #1 |
Can anyone help me find the MTF graphs for Tamron SP AF11-18MM F/4.5-5.6 Di II LD Aspherical (IF)?
I have been trying to compare the Sigma and Tamron super-wides to the Canon EF-S 10-22mm. So far the Sigma completely fails with resolution at 12mm but I can't find MTF graphs for the Tamron?
Thanks in advance. |
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07/19/2005 12:13:27 PM · #2 |
| After doing a google search, as well as, combing the Tamron web site, I found nothing. Since I live so close to Tamron I decided to call their tech support but I'm afraid I've come up empty handed as they told me they don't have them and don't release them to the public. Sorry. |
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07/19/2005 12:46:45 PM · #3 |
not saying you won't find it but I have never seen a mtf chart for
a tamron lens. I usually check popular photography's website for their
analysis of the lens. It is usually objective and fairly acurate.
//www.popphoto.com/default.asp?section_id=2
and if you can't find it there check the archive
//www.popphoto.com/article.asp?section_id=2&article_id=351&page_number=1
edit: I don't think they have reviewed it yet, but the tokina 12-24 f/4
got high marks!
Message edited by author 2005-07-19 12:48:59. |
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07/19/2005 06:18:37 PM · #4 |
Thanks to both of you for that! Esp Olyuzi for actually ringing them! That's beyond the call of duty!
It's interesting that Tamron don't publish the MTF graphs. Perhaps they're frightened of the poor impression it might give. But it doesn't seemed to have stopped Sigma from publishing a truly appalling MTF for their new 12-24mm. I mean that basically says that that lens can't resolve a single bit of detail to any acceptable degree anywhere in the image at 12mm.
Has put me right off! Compare that graph to Canon's 10-22mm (can't find it right now) and I'd buy the Canon any day (the graph stays above 0.9 for most of the image and thn drops off at the edge). |
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07/19/2005 07:15:36 PM · #5 |
Do remember that Canon's published MTF plots are "theoretical" MTF based on computer modeling of the optical system. It's not that they are inaccurate, it's just that they are not the result of direct measurement of any sample of the lens(es) in question.
Also bear in mind that some MTF plots use 40 lp/mm as the "high frequency" plot, some use 30. Canon uses 30.
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07/20/2005 10:00:59 AM · #6 |
Originally posted by kirbic:
Do remember that Canon's published MTF plots are "theoretical" MTF based on computer modeling of the optical system. It's not that they are inaccurate, it's just that they are not the result of direct measurement of any sample of the lens(es) in question.
Also bear in mind that some MTF plots use 40 lp/mm as the "high frequency" plot, some use 30. Canon uses 30. |
Very true MTF charts should be looked at subjectively. They are very
vague guides to the real ability or inability of a lens. This is why I
really like the the reviews that "Populary Photography" magazine does.
They are easy to understand and it is an actual test of a production
lens. I tend to believe popphoto's reviews more than an mtf chart. |
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