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p.1 #1 · p.1 #1 · VC problem with new Tamron 24-70 f/2.8 VC lens? | |
I just received a brand-new Tamron SP 24-70mm f/2.8 Di VC USD lens. Shortly after I mounted it on my camera, I noticed/suspected that the IS simply wasn't working (or wasn't turned on)... I've shot with a variety of IS and non-IS lenses, and I'm familiar with the "look" through the finder when IS in engaged, and I'm also familiar with the very quiet "whirring" sound that most IS lenses seem to make (generally only audible if you put your ear very close to the lens).
Anyway... after mounting my 24-70/2.8 VC lens on both my 5D3 and 70D, it *seems* like the VC isn't functioning properly. The first time I mount the lens on a camera body & half-press the shutter, I believe the VC is working (I can hear the constant gentle whirring sound when I put my ear to the lens). HOWEVER, after I've engaged the VC once, it seems to stop working - basically, I can't get the "gentle whirring" sound to occur with a shutter half-press, and it also doesn't seem like the VC is working. If I dismount and remount the lens, I can (seemingly) get the VC to work once, and then it won't work again until I dismount the lens.
Note: my only "evidence" that the VC is working is the gentle whirring sound, which sounds very much like the other ~5 IS lenses I've used. In practice, I can't see a difference in sharpness with VC on or off. (It could simply be a small sample size, but I'm also seeing a "double image" like problem in some shots at around 1/8sec with VC "on," where the same shot with VC "off" doesn't have the double-image like problem...)
Any thoughts on this, from others who have used this lens? Is my lens defective, or am I missing something or doing something wrong? I've never used a Tamron lens before, so I wasn't sure if there's some "quirk" to their VC implementation...?
The constant gentle whirring sound (which is very similar to Canon IS lenses like the 100L IS, 24-105L, etc; and is only audible with my ear a few inches from the lens) -- am I correct in assuming that's the sound this lens makes when VC is properly engaged?
Thanks in advance for any help!!
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