sel16 and ND filters?

Started Jan 25, 2013 | Questions thread
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sel16 and ND filters?
Jan 25, 2013

I apologize in advance if this has been asked/answered.  I've searched Google and here on the forums and couldn't find the answer.

I would like to know what size circular ND filter would be big enough so that I would not get any vignetting on the 16mm lens?   As you can see from the picture below I am getting some noticeable vignetting and although not horrible I was hoping someone knew from experience what size filter (with the use of stepup rings) would eliminate this.  As an oh by the way, I am looking to upgrade my homemade welders glass filter (49mm to 52mm stepup ring with piece of welders glass inside) to a true 10stop ND filter.

+ 27s . f/8.0 . ISO 100 . 16 mm

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Sony Alpha NEX-5N Sony E 16mm F2.8 Pancake Sigma 30mm F2.8 EX DN Topaz Adjust Topaz B&W effects
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