ND Filter with milky results
Nov 13, 2019 17:34:06 #
Attached is the result from a backyard photo taken with an ND 8 filter which would require an additional shutter speed of 3 stops. And even though I tried various shutter speeds with and without the viewfinder covered, they all have a milky or foggy appearance. Now these are a quite inexpensive set, but I at least thought I'd get better results than this. Oh, the filters are 3 inch square, rather than the screw in kind. Any suggestions would be most helpful. Ken
Nov 13, 2019 17:55:06 #
larryepage
Loc: North Texas area
Photobum wrote:
Attached is the result from a backyard photo taken with an ND 8 filter which would require an additional shutter speed of 3 stops. And even though I tried various shutter speeds with and without the viewfinder covered, they all have a milky or foggy appearance. Now these are a quite inexpensive set, but I at least thought I'd get better results than this. Oh, the filters are 3 inch square, rather than the screw in kind. Any suggestions would be most helpful. Ken
I've been working with kids building pinhole cameras for the past few weeks, so I'm hoping that my comments aren't tainted by repetitive experience over that time... It appears to me that there is a light leak somewhere in your filter system or mounting. It appears that there is clouding originating on the left side of the image. Double check that everything is fitting closely together. It won't take much of a gap somewhere to produce the clouding that we are seeing.
Nov 13, 2019 17:55:40 #
This one is 1/30 sec with f/7.1 and ISO 200. With the sky so blown out in upper left, one thought is over-exposure in addition to any issue with the filter or camera housing. What was the fastest shutter speed you used? Any with smaller aperture?
Nov 13, 2019 17:57:07 #
Photobum wrote:
Attached is the result from a backyard photo taken with an ND 8 filter which would require an additional shutter speed of 3 stops. And even though I tried various shutter speeds with and without the viewfinder covered, they all have a milky or foggy appearance. Now these are a quite inexpensive set, but I at least thought I'd get better results than this. Oh, the filters are 3 inch square, rather than the screw in kind. Any suggestions would be most helpful. Ken
It looks like flare.
Did you use a hood?
That is why I love my Variable ND by Hoya. Tack sharp and fists the lens with the hood on.
You might try it.
But these look like a hood was needed.
Nov 13, 2019 18:03:15 #
Looks to me like you may have had direct sun light on the ND filter or, maybe a light leak.
Nov 13, 2019 18:20:37 #
Well, I tried a variety of under/over exposures and all lead to the same result. So, I'm also thinking of light leakage. Thanks to all for the tips.
Nov 13, 2019 18:23:23 #
It looks like flare in addition to possible overexposure. The sun appears to be high to the left but still towards the camera. A good test would be if you had turned around 180 degrees so that sun would be behind you. You might look into getting a screw-in ND filter and use a lens hood. Maybe your square ND filters would give better results if they are well shielded.
Nov 13, 2019 18:27:02 #
CO wrote:
It looks like flare in addition to possible overexposure. The sun appears to be high to the left but still towards the camera. A good test would be if you had turned around 180 degrees so that sun would be behind you. You might look into getting a screw-in ND filter and use a lens hood. Maybe your square ND filters would give better results if they are well shielded from light
All good info. Thanks a bunch.
Nov 13, 2019 18:36:24 #
Kind of out in left field, but did you bring the camera out from indoors, looks like a foggy lens. Has happened a few times to me
Nov 13, 2019 18:49:18 #
canonjohn922 wrote:
Kind of out in left field, but did you bring the camera out from indoors, looks like a foggy lens. Has happened a few times to me
No, I noticed this a few days ago while outdoors for a few hours with the same equipment. But thanks for the thought.
Nov 13, 2019 19:39:15 #
I've never used square filters. Are the edges covered/coated so light can't get in sideways and bounce around inside the filter?
Nov 13, 2019 19:45:01 #
No. On mine, there is a noticable gap between the first filter slot and lens barrel. I don't know if all square sets are like this, but this seems to be an issue .
Nov 13, 2019 19:50:21 #
Photobum wrote:
No. On mine, there is a noticable gap between the first filter slot and lens barrel. I don't know if all square sets are like this, but this seems to be an issue .
Could intense light from the side get in and cause the above scenario?
Nov 13, 2019 19:57:30 #
Longshadow wrote:
Could intense light from the side get in and cause the above scenario?
That's pretty much what I suspect. I've got more investigating to do.
Nov 13, 2019 19:59:44 #
Photobum wrote:
The holder just pushes onto the end of the lens? Can't be made more snug, closer so no gap?That's pretty much what I suspect. I've got more investigating to do.
If you want to reply, then register here. Registration is free and your account is created instantly, so you can post right away.