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| p.1 #5 · Squeeze lens barrel and camera doesn't focus? |
The primes are made of plastic and can flex. The zooms have more metal and don't flex.
This is going to sound strange (or maybe not, as I don't read lens manuals).. But I've noticed when I'm shooting an event (wedding) and I hold my camera in my right hand and my lens rests in my left hand, I can focus and take a photo. However, if I'm slightly squeezing the lens barrel (not the focusing ring) the camera won't focus, it's like autofocus switches off.. This happens only with my prime lenses (24G, 35G, 50G, 85G) and not with my zooms (14-24G, 24-70G, 70-200G VRII). Also I have two D700 bodies (didn't really notice on them, and haven't tested, but think it may have happened while using them), one D800 body (didn't test on this one either as I use it in the studio) and two D4 bodies (happens on both of the D4 bodies confirmed)..
Is this a feature of some sort (like a manual focus override sensor built into the lens), or what's going on?
And yes, again, I'm not gripping the focusing ring, I'm gripping the lens barrel behind the focusing ring, and I'm not ninja gripping it, just holding it with my thumb and pointer finger for added support (those damn D4s get heavy after a few hours).
Anyone care to chime in?