Testing a new sunshade

I just got a new threaded generic sunshade for one of my older lenses. To
test it should I just take a photo of the sky and look for dimming in the
corners? Using it mostly for protection, but don't want it to clip the
image.

Sheldon

Sheldon wrote:

I just got a new threaded generic sunshade for one of my older lenses. To
test it should I just take a photo of the sky and look for dimming in the
corners? Using it mostly for protection, but don't want it to clip the
image.

Take the shot at maximum aperture (wide open, lowest f number). If it
doesn't show up in the corners there, you're safe at smaller apertures.

--
Jeremy |

Jeremy Nixon wrote:

Sheldon wrote:

I just got a new threaded generic sunshade for one of my older lenses.
To test it should I just take a photo of the sky and look for dimming in
the
corners? Using it mostly for protection, but don't want it to clip the
image.

Take the shot at maximum aperture (wide open, lowest f number).

And if it's a zoom, the widest setting.

--

Stacey

Sheldon wrote:
I just got a new threaded generic sunshade for one of my older lenses. To
test it should I just take a photo of the sky and look for dimming in the
corners? Using it mostly for protection, but don't want it to clip the
image.

Sheldon



Including the advise of Jeremy and Stacey, there are other ways to test
for vignetting. One sure way to assure an even distribution of light
accross the lens, is to cover the mounted hood with a CLEAN white
hanckerchief when pointing at the sky. This will assure an even
distribution of light entering the lens. Be sure the camera is in manual
mode.

nick c wrote:


Including the advise of Jeremy and Stacey, there are other ways to test
for vignetting. One sure way to assure an even distribution of light
accross the lens, is to cover the mounted hood with a CLEAN white
hanckerchief when pointing at the sky.

I did forget, you need to check the lens at infinity.

--

Stacey