cpe1991
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Photonadave wrote:
Yes the sensor will most likely be damaged if the lens is focused at infinity on the sensor when pointing at the sun however bear in mind that if the lens focus is set closer than infinity when pointed at the sun then the infinity focus of it's projected image can be anywhere in front of the sensor where it can wreak havoc on other internal parts of the mirror/image box or even the lens itself most likely if it is a short telephoto macro or a longer focal length telephoto lens. I agree that the most damage is caused by lenses with the largest front elements most notably a 300mm f2 (150mm dia), 600 f4 (150mm dia) or the 500mm f2.8 Sigmonster zoom (179mm dia). The larger the front element the more light energy/photons that is collected to then be concentrated downstream at the image focus plane regardless of focal length of the lens. Hmmm, imagine the energy that a really large telescope.
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As a little boy, nearly 70 years ago, I spent many a happy time burning holes in paper, wood etc with magnifying glasses and gathered a lot of practical experience! A misspent childhood can provide useful learning for later on in life as I have had a fascination for lenses ever since, which quickly translated into a love for optical instruments and photography.
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