Variable ND filter

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Ruidoso Bill

Senior Member
Bought one of these (cheaper model) the other day and started to play with it today. All shots were done at f9, 1/160, ISO 100. This first test was to see how linear (or not) the filter is, it is stepped on the adjustable ring from Min (0) to Max (10).

DSC_3849-Edit.jpg

To view all shots click here: WJY Photography | VND Filter Test

It really darkens quick near the higher end.
 
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R

Ruidoso Bill

Senior Member
480sparky said:
Now correct the exposure and see when the X and weird colors start to show up.
Click to expand...

Not sure what "X" is but I did turn the lens up to f22 and the exposure up to 30 seconds and got some purple ca in the 9.5 to 10 range.

From what I have been able to see it will be useable for what I want.

I'll put up more shots tomorrow with corrected exposure.
 
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480sparky

Senior Member
WJYPhoto said:
Not sure what "X" is but I did turn the lens up to f22 and the exposure up to 30 seconds and got some purple ca in the 9.5 to 10 range.

From what I have been able to see it will be useable for what I want.

I'll put up more shots tomorrow with corrected exposure.
Click to expand...

Dial it up enough, and an X will appear in the image.

VNDXeffect.jpg


And it's not purple CA you're seeing... it's just the color cast caused be the extreme darkening. VNDs are rarely truly Neutral.
 
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480sparky

Senior Member
Keep it 8 or under and you should be fine.

You should also be able to take a photo without the filter, and one with, of a gray card and create a profile for the filter to correct the color cast in post.
 
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