 Ketan m. Doshi |
Lens cleaning Hi, I own a canon eos300 sigma 28-200. After using this excellent equipment for a year I saw some dots in the viewfinder. So I cooly detached the lens and cleaned the focussing screen with a blower. Now the most important part. I tried to clean the small lens also which fits into the camera body, the rear part of the lens cylinder. Which lateron I realised that I should not have touched. after cleaning when I see that lens keeping in light, I see (doubt) that it is not cleaned properly and I feel (see) some sticky shades there. I tried it couple of times but I could not do so to my satisfaction. Or maybe I do not know what it should be like. So how can you be sure that it has been cleaned properly. I hate the lens cleaning solutions as they make the lens worse. Blowing + tissue is the best method that I have experienced. Appreciate a reply. Thanks
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John A. Lind |
Ketan, While I am reluctant to use a lens cleaning solution, I do use it when nothing else is working to clean the lens. Hard scrubbing with a dry (lens cleaning) cloth or especially a tissue can grind crud into the lens coatings and create "cleaning marks." While they may seem benign, the abrasion of "cleaning marks" are among the worst for creating flare; a very minor chip or very small scratch near the edge is actually less of a problem. The rear element of a lens is also more important to not only keep clean, but to keep from being abraded, scratched, pitted, or chipped than the front element. Damage to a rear element has a much greater affect on image quality than similar damage to the front one. One of the secrets to using lens cleaning fluids is *not* putting them directly on the lens, but on the tissue or cloth instead and then using that to clean the lens with. See the previous question from almost a month ago, a part of which discussed lens cleaning: -- John
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Ketan m. Doshi |
Thanks a million John, Only one doubt that how will I come to know if at all I have at all damaged the rear element? Since I do not see any flare in viewfinder, does it mean that the rear element is ok? So How to clean rear element, at what frequency and how to make sure that it is clean? Thanks once again for taking out your valuable time. ketan
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