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Thread: Lens reviews

  1. #1
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    Default Lens reviews

    We are going to begin working on an extensive project, on lens reviews. I would like this to be a real world working and review. If you have any ideas please let me know.
    Thanks
    Tont

  2. #2
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    Default Re:Lens reviews

    Actually, I would like to see the possibility of a \"user comparison\" possibility.
    What I mean is, publish test targets (I think there are a number around on the internet) and setup directions, so everyone can \"test\" their lens themselves.
    These results could then be compared with the \"professional grade\" tests you guys performed..

    I thought about this whilst reading a lot about QC problems regarding the 14-54mm .. which I happen to have..

    of course, you\'d have to perform the tests with both bodies: E1 and E300 to cover all users.. (and extend it with future body/lens combos, and test at a number of set mm/aperture combinations)... elaborate, but I think a real addition to the standard tests..

    since we all know, there is always a variance in quality, this way, everyone can compare their own results (provided you use the same setup) with the results online, and see if theirs is better or worse..

  3. #3
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    Default Re:Lens reviews

    I like the idea. I\'d even go further and suggest that we create a detailed evaluation of every 4/3rd camera, lens and accessory. The goal would be to make this site \"the\" place for the best 4/3rds information.

    Regarding lenses, I like the reviews that PhotoZone has done (http://www.photozone.de/8Reviews/index.html). If some of these tests are beyond our capabilities, then perhaps we could partner with someone like PhotoZone in this effort.
    Best regards, FL

    Pursuing excellence...

  4. #4
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    Default Re:Lens reviews

    FredMiranda.com has a very simple but effective, I think, gear review section. Photozone is good but at the same time it doesn\'t allow reviewer to comment his/her subjective evaluation/opinions. I like to hear what other users feel and his/her subjective likes/dislikes about a piece of equipment.

  5. #5
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    Default Re:Lens reviews

    Wouldn\'t you be better off doing all lens reviews on the same camera/setup. That way the only variable becomes the lenses themselves?

    Just a thought.

    Cheers
    Wazza

  6. #6
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    Default Re:Lens reviews

    I like the photozone style of reviews, but i would like to see more \'user\' style reports besides all the imatest results, and also a RAW vs jpg comparison?...

    oh and another cool project would be size comparison of the whole lineup with a few more \'famous\' lens like the nikon 70-200 vr, canon 100-400 f4-5.6 usm L etc...

    Post edited by: hammer_400, at: 2005/09/12 04:18

  7. #7
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    Default Re:Lens reviews

    I like subjective commentary but only to a point. For example, one reviewer may praise the ergonomics of a camera while another reviewer condemns the same camera for being difficult to use. Too many reviews reflect the bias of the reviewer and/or publisher.

    Whenever an opinion is offered in a review it needs sufficient explanation so the reader will understand the basis for the opinion. It seems to me that what is missing from many so-called \"reviews\" is objective hard data to back up the reviewer\'s analysis.

    Why don\'t we establish some guidelines for reviews for this site. These guidelines can include a format that all reviewers should follow. For example:

    [ol][li]Introduction – Briefly explain what is being reviewed.[/li]
    [li]Product Description – Briefly describe the product, its purpose and appearance. This would be a good place to include labelled photo(s).[/li]
    [li]Performance – Describe how the product was tested and provide the results of the tests. Where appropriate, compare the test results to the manufacturer specs.[/li]
    [li]Analysis – Explain the significance of the test results.[/li]
    [li]Opinion – Subjective opinion and recommendations with explanation.[/li]
    [li]Manufacturer Specs – Finally, conclude with a full listing of the manufacturer specs and/or links to more information.[/li][/ol]

    What do you think?
    Best regards, FL

    Pursuing excellence...

  8. #8
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    Default Re:Lens reviews

    i like it! !!!
    opinion is kept seperate from the objective data.

  9. #9
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    Default Re:Lens reviews

    a carefully crafted review format can provide an optimum balance b/w the objective v. subjective opinions.

  10. #10
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    Default Re:Lens reviews

    The ideal situation would be to use the same camera for all of the lenses. This may not be practical (unless I can get some of the users to send me their lenses to test. LOL.

  11. #11
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    Default Re:Lens reviews

    I have been thinking a lot about these lens test.
    Here is what I came up with.
    #1 I am going to shoot it all with either 2 E-1\'s or 1 E-1 and E-300.
    #2 The test needs to include. Sharpness, Vignetting, And Distortion.
    #3 I don\'t know how I could set it up with CA test.... Any thoughts on this would be helpful.
    #4 But what I did was create a gird. The same image is placed in each cell. And each cell is marked for acruacy. I will compare each cell against the image shot from the 50mm.
    #5To keep the perspectives the same, I will go to 1\" per MM.
    #6 I think that it also should be per MM in 35mm. So it would really be 2\" per MM.
    #7 They will all be developed in Studio/Viewer. With the exact same settings.
    #8 Each lens will be shot wide open, stopped down 2-3 stops (I haven\'t made up my mind yet) and thn at 22F.
    #9 The lines with serve 2 purposes 1 to keep cells straight. And 2 to check for distortion.
    #10 The images of the block\'s will tell sharpness in each cell.
    #11 if any are darker/lighter then that will tell of Vignetting.
    A Cell:

    The whole Grid:

    BTW: the full size of this image is 32\"x40\" Which I reasoned would be more than enough for the shots.
    Comments Suggestions?
    I would also like someone(s) to help with the right up....
    This will contain all the practical info, such as size, weight, F stops etc.
    Any takers?
    T

    Post edited by: tspore, at: 2005/09/24 02:10

  12. #12
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    Default Re:Lens reviews

    Hi Tony,

    The desire to create a standard way to evaluate a lens is great but the image cells of blocks seems so imprecise. Plus the blocks are so boring. I favor a more scientific system like Imatest (http://www.imatest.com). You can see a brand new review of the ZD 50-200mm f2.8-3.5 at Photozone where they used the Imatest system (http://www.photozone.de/8Reviews/len...2835/index.htm).

    The Imatest system should help you evaluate all of the criteria you mentioned (sharpness, vignetting, distortion, color aberation, etc.). It is a software-based measurement system and costs only US$79. The only problem is that it is only available for MS Windows (if I remember correctly, you use a Mac). However, Imatest claims that their software will run on a Mac with a Windows emulator.

    Have a look at Imatest and let us know what you think.
    Best regards, FL

    Pursuing excellence...

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