Tokina 10-17mm Problem
Posted 04 August 2008 - 12:10 AM
Both these images were taken on Manual. F11 @ 1/100th. ISO 100. Strobes on manual too. Under the same environmental conditions. Yet you can see very different exposures (both in foreground and background areas). I realise that neither is very good exposure. My concern is the difference, when there should be none. The right hand image is what I would expect from these settings in these conditions.
I have had this problem just a couple of times with the lens. And on both my D2X and in the case above my girlfriend's D80. So I don't think it is camera related.
The only difference has been in the orientation of the camera. These were taken with camera different ways up.
I suspect that the problem is a communication one between the lens and camera body, aggravated by certain camera orientations. I had this problem on my D2X when shooting vertically up. One possiblity is that the lens is not stopping down properly - although the depth of field looks very similar in these two images - hard to judge. Maybe a sticking aperture? This is a G-Type lens, by the way (Nikon speak for no aperture ring).
Anyone got any ideas on the cause. Contacts look clean.
At present the problem is very rare. 1 in 1000 shots or so. But I'd like to know the cause and remedy. Also as this is a popular lens here I thought it would be useful to share my concerns.
Also does anyone know a contact for repair/servicing for the Tokina in the UK?
Posted 04 August 2008 - 01:35 AM
This is sad, but I have had similar problems with a Tokina lens in the past, and no-one seemed to know who would fix it. The problem was mechanical in mine, progressed to total failure, and I junked the lens. It left me so suspicious of Tokina, that I have resisted the urge to use the 10-17, despite its excellent press.
Posted 04 August 2008 - 07:41 AM
I had a similar problem years ago with my Nikon 35mm/f2 lens where it would occasionally overexpose a shot a by a couple stops--turns out the aperture was sticky. sometimes oils leak out and get on the blades making the diaphragm fail to fully stop down to the correct aperture. a simple servicing fixed it although I had to do it twice b/c the first repair shop did a poor job.
Posted 04 August 2008 - 10:08 AM
Website: http://www.jonbertsch.com, http://www.thalassagraphics.com
D200...Ikelite Housing...Ike DS125...Nik 105mm|Tam 90mm, Tokina 10-17mm...Nik V
Posted 04 August 2008 - 01:20 PM
I once bent the fin on my 300/2.8 and kept getting overexposed shots cause the fin wasn't engaging with the camera control properly. This was likely due to mounting the lens in a hurry and knocking the fin out of place. I compared it to my other lens mounts, and it was noticably bent.
So with a very nervous/sweaty/shaky application of a pair of pliers got it bent right back into shape and it's worked great since. It started as an occasional oddity and eventually became full-on. Hope this helps. Cheers,
Posted 05 August 2008 - 12:23 AM
Posted 05 August 2008 - 12:32 PM
Never had a focus problem with mine - only quite a dose of CA!
Water Temp (just cold & Nasty)