One more! Nice!

And thanks for the advice of cleaning silver mirrors! Once I damaged an old silver-coated mirror with a lens tissue, was not careful enough.

Igor

Hi MZ!
Glad to know there is someone else here dealing with optics+science!

Igor

Looks like kitchen towel to me :O
I would probably be scared ti try these... If they say they use it for car cleaning - I would not try it on MY optics

I got one from jessops some time ago wich looks more appropriate, but use it mainly for camera LCD cleaning; To clean optics, I use optics cleaning tissues http://www.thorlabs.com/thorProduct.cfm?partNumber=MC-5 with a drop of pure (99.99%) ethanol, and taking care not to touch lens mount not to spread dust from the mount edge onto the lens. Mostly just touch the lens with the tissue corner (wet in ethanol) and gently drag-lift it away.

Hi i-Berg,
No I haven't yet. Still learning it

When that fault happened did it still work with your camera in the opposite setting of aperture ring? Mine works when the aperture ring is set as it should not be
Mine cost me £108 including delivery - so do not think I want to spend £80 to get it set properly by Sigma
I've just seen the new one like that for £170 on ebay...

Seems unlikely - why then it works in the opposite setting (in which it should not ).
Unless someone got with his hands inside it and mis-wired contacts when assembling back Joking D) Do not know to be honest what could it be.

I'm not sure I'll do it I've just seen them today - nice couple of respectable age, they've driven down to Sheffield from another town to help me out with that. I realised they had used it in this way all the time without bothering about how it should be )) So I don't really feel to hassle them again. In fact the lens works, but the thing which bothers me - was that consequence of some drop, or unprofessional repair, or is it a manufacturer fault - are there any more such lenses doing same thing?
Igor

The direction - when it is attached to the camera and lens is looking forward;
The case is that it communicates with the camera when the ring is not set to "A", and it is not recognised when I set-lock the ring to "A", that's the point.
Cheers, Igor

Good point, Mike, thanks. I need to do it indeed.

Hi folks, putting second separate post for a day I've got a lens in the subject on ebay, all looks fine, however the aperture ring is doing a bit funny things. In the user's guide they say, to have it recognized by the camera I need to set the aperture ring onto "A" after lock; which in fact means to twist the aperture ring as far as possible to the right, then press lock button and move a bit more to the right. However in my lens I need to twist the ring as far to the left as I can, only then camera can control it. If I do as they say in the manual - I will get blinking "F---" Has anybody seen anything like that? Cheers, Igor