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    #11
    Senior Member
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    Just curious. Can anyone who has experience testing lenses tell me, is there much variation between individual copies of the same lens vs the same focal length fstop but different brands?

    If so, wouldn't it make the various online lens comparison sites worthless?


     

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    #12
    Senior Member Duke M.'s Avatar
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    A few of the cheaper brands, older lenses, certain models and hand made lenses have significant variation. However, modern mostly machine made lenses with good quality control are very consistent. Think of it like a car. Fiats seem to have wide variation while most Lexis are pretty consistent. A 1960's Toyota is a tin can, the 1990's Toyotas are far superior.


     

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    #13
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    Any opinions on the Edmund Optics ISO chart?

    http://www.edmundoptics.com/onlineca...productID=2287


     

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    #14
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    For $20 can't go wrong. Picked one up after reading the excellent blog post on
    http://www.lensrentals.com/blog/2010...to-test-a-lens


     

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    #15
    Senior Member 8string's Avatar
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    That's $200 I think if I read the web page right. Makes it a harder choice. How about a lending library?


     

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    #16
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    ?
    'If you want to be more complex, I recommend the simple Resolving Power chart from Edmund Optics that you can buy for less than $20'


     

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    #17
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    I believe 8string was referring to the ISO 12233 resolution chart I linked, not the chart mentioned in your link.


     

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