Question about Canon Digital Cameras

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Very poor definition on unsharpened converted raw files to tif format,on my Canon 1DS MKII through Image browser.A number of tests have been carried out under controlled conditions.Both location and studio at an ISO of 100,using a tripod and various Canon L series optics.The results when looking at 100% magnification are poor in both manual and auto focus modes,as indeed are the images when printed out at A3.All the files have been shot without any post sharpening this has been set at zero on the camera body.Please advise Many thanks Mike.

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  • chopperjoe Sep 28, 2008

    I should have pointed out the original raw files where shot with the camera body parameters set at zero sharpness.

    I have since carried out sharpening on the tif files at 100% through adobe USM at several settings since, which I consider still to be basically poor when viewed on screen and outputed at super A3 they are as follows:

    1.85% - Radius 1 - Threshold 4

    2.120% - Radius 1 -Threshold 1 & 2

    3.200% - Radius 1 - Threshold 1 & 2

    4.300% - Radius 0.3 Threshold 0

    I have utilised raw files many times on several Canon body's over the years (D30 - D60 - D10 - D5) al of which have not seen such poor definition prior to USM sharpening or indeed afterwards.

  • chopperjoe Sep 28, 2008

    Thank you for all your help and infomation which I have taken on board,I am sure your suggestions would improve the final result.I still feel their are additional problems within the camera body itself.I am converting the raw files to tifs in the same manner I have done in the past on far inferior Canon body's and I have not experienced such disappointing results before,the files are basically unsharp even when taken through USM at 100% at various settings.

  • chopperjoe Oct 01, 2008

    Thank you for your help,I will try going down this route and if it's not successful I will return the body to Canon. Many thanks Mike

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Hi mike,

I would like you to visit this site that i hope will be helpful.
www.dphotojournal.com/canon-ef-24-105mm-f4l-is-usm/

If you are interested in post processing,
i recommend you to use post sharpening tool DIGITAL PRIMER.
www.lib.umd.edu/dcr/publications/DigitalImagingPrimer.pdf

Thanx mike,
Thanx for using fixya,
waiting for your comments........

Posted on Sep 28, 2008

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Do you have the manuals.if yes what does it says.

Posted on Sep 28, 2008

  • tech gurus Sep 28, 2008

    TIFF (*.TIF, *.TIFF)
    TIFF is the industry standard image fileformat. In many ways, a basic TIFF isjust a big array of pixels stored in alarge file. It doesn’t contain much of the sophisticated information used in Photoshop (especially Layers). TIFFs do contain color space information which is important for color management. TIFFs are a very safe way to save your image files since the image is saved in a loss-less state i.e., there’s no data conversion caused by image file compression.
    Use TIFFs any time a file is used outside of Photoshop
    . TIFFs support both 8 bits and 16 bits per channelimages.Adobe has added a new wrinkle to TIFF, saving layers. As faras I know, this extended version of TIFF is only supported byAdobe. I recommend saving any TIFFs without layers.One TIFF option allows compression of TIFF files. Use thisoption rather than image compression for TIFFs to ensuremaximum compatibility with other programs and systems.The other TIFF options aren’t very important and should beleft unchanged.



    for raw files

    Many digital cameras can also save their images as RAW files. These areunprocessed digital camera images. Photoshop can process them to a higher-quality image than JPEG files. One of the biggest advantages of RAW files isthey have more that 8 bits per channel of information and can, therefore, beedited more than JPEG files. Every camera manufacturer has its own proprietaryRAW file format, the term RAW refers to a category of file formats. Itencompasses a wide range of formats include NEF (Nikon RAW), CRW (Canon),as well as many other formats. Adobe Photoshop CS2 supports most RAW fileformats.



    for more detailed help with proper directions and pictures just click this link

    http://www.scribd.com/doc/5873494/photos...

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