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<blockquote data-quote="WayneF" data-source="post: 220812" data-attributes="member: 12496">FWIW, I have suffered red streaks in a&nbsp; 70-200 mm lens.It may be a different thing, since the ones presented before here are three small streaks from left to right.&nbsp; Mine was like this:<img src="http://www.scantips.com/g2/andromeda.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />It is not coming from outside the camera.&nbsp; This was at an astronomy clubs dark site, and it was Dark, no lights allowed anywhere.&nbsp; And no one else was there at the time anyway.&nbsp; &nbsp; And it was independent of how the camera was aimed&nbsp; (mostly up, nothing in field of view).&nbsp; Mine were 20-25 second exposures.<img src="http://www.scantips.com/g2/redstreak.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Here is another reference to same thing (in Swedish):<a href="http://astronet.se/phpBB3/viewtopic.php?t=8082" target="_blank">Astronet forum • Visa tråd - Märkligt ljusfenomen på sensorn med olika objektiv</a>He says the images with the red were 70-200, and those without were 24-70mm.&nbsp; He says the fix is to turn off AF - but it has to be off with the switch on the lens (not the body).My streaks were in every shot with a 70-200mm lens, but in none with a 14-24mm lens.And I could not duplicate this in the 70-200 again (in tests at home).&nbsp; The lens AF switch could have been the variable?There are AF and VR mechanisms in there. Whether or not those use IR sensors is unknown to me.FWIW</blockquote>

[QUOTE="WayneF, post: 220812, member: 12496"] FWIW, I have suffered red streaks in a 70-200 mm lens. It may be a different thing, since the ones presented before here are three small streaks from left to right. Mine was like this: [IMG]http://www.scantips.com/g2/andromeda.jpg[/IMG] It is not coming from outside the camera. This was at an astronomy clubs dark site, and it was Dark, no lights allowed anywhere. And no one else was there at the time anyway. And it was independent of how the camera was aimed (mostly up, nothing in field of view). Mine were 20-25 second exposures. [IMG]http://www.scantips.com/g2/redstreak.jpg[/IMG] Here is another reference to same thing (in Swedish): [URL="http://astronet.se/phpBB3/viewtopic.php?t=8082"]Astronet forum • Visa tråd - Märkligt ljusfenomen på sensorn med olika objektiv[/URL] He says the images with the red were 70-200, and those without were 24-70mm. He says the fix is to turn off AF - but it has to be off with the switch on the lens (not the body). My streaks were in every shot with a 70-200mm lens, but in none with a 14-24mm lens. And I could not duplicate this in the 70-200 again (in tests at home). The lens AF switch could have been the variable? There are AF and VR mechanisms in there. Whether or not those use IR sensors is unknown to me. FWIW [/QUOTE]

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