Sigma OS & cleaning

Peter69

Peter69

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I've just returned from Newquay after this weekends jetski freestyle comp and my filters need a bloody good clean (2 stroke and salt - who said don't use uv filters?).
How do I clean them without damaging?
It was suggested wet lens wipes??

As a a side note, does the Sigma OS work with back button focus?
My lens was just repaired and some images have a slight double edge that looks like camera shake even at 1/800 and OS mode 2.

Any help is always appreciated
 
Hi
I'd try an ultrasonic cleaner. About £30 from Amazon. Have used mine to clean sunglasses when they get suncream on them. They come up mint. Just need to change the water more regularly. The other item I use it to clean are watches. Again , they come out spotless.
 
Whether you use UV filter or not is perfectly up to you. I generally don't use UV filter unless I know I will be shooting in places where risk might happen. i.e beach, sand, muddy place etc.

I think on nikon lens, the back button focus won't activate the VR. Have you done any testing on the sigma OS? Try one with the back button and one with shutter half press.
 
The slight double edge might be caused by the UV filter?

Certainly on Canon fit back button focus does activate the OS.
 
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IIRC correctly with BBF the OS will activate on a half shutter press, not with the Focus button. Which tbh, I think I prefer.
 
badboy1984 said:
Whether you use UV filter or not is perfectly up to you. I generally don't use UV filter unless I know I will be shooting in places where risk might happen. i.e beach, sand, muddy place etc.
Click to expand...
Thats exactly the conditions I was in - I'd hate for my lenses front element to get covered like my filters have
 
This has confused me more.

Nikon say BBF doesn't engage OS/VR/IS until shutter release is presses & Sigma say OS takes about 1 second to stabilise. These do not appear to be compatible statements. :thinking:

from instruction manual for lens

(It takes approximately 1 second to produce a stable image, after pressing the shutter button halfway)
Click to expand...
from http://www.nikonusa.com/en/Learn-An...-of-using-the-af-on-button-for-autofocus.html

Using AF-ON extends battery life in the camera. Mark explains: “When the shutter release controls all functions, focusing simultaneously engages the Vibration Reduction (VR) system. When using AF-ON or back button focus you can observe or follow a moving subject, constantly adjusting the focus, without engaging the VR mechanism until the moment the shutter release is depressed. While this might seem trivial, when observing wildlife over extended periods, waiting for a specific moment to trip the shutter, driving the VR continuously can drain battery. The back button technique only uses the VR for brief periods when the shutter is actually released, maximizing battery life.”
Click to expand...
 
That isn't how I read it.
I read it as VR works when you take the picture not half pressing then taking picture.
I guess I need to turn my ears on and listen a bit harder
 
I can confirm VR engage when half press shutter. You can see on the view finder that the VR is working then you can snap.

It works like that on my 70-200 f2.8 VR1
 
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