Wide Angle Lens Question
Dec 11, 2014 16:46:53 #
I have a Canon 7D, I recently bought a Canon 10-18mm IS Lens. When I set the lens to either 10mm or 12mm and take a picture with a flash there is a dark place at the bottom of the picture. See example. The dark place goes away at 14mm - 18mm. Is this a normal condition?
Dec 11, 2014 16:51:16 #
Dec 11, 2014 16:55:43 #
Shadow from the lens when using a wide angle.
Use an external flash and the shadow will go away.
Pat
Use an external flash and the shadow will go away.
Pat
Dec 11, 2014 16:58:20 #
Interesting! I have the same lens for my T3i and was able to duplicate your issue. Guess we can't use the on-camera flash with that lens :|
Dec 11, 2014 17:12:01 #
Are you using a lens hood? if so, take it off when using flash. I have this problem with my camera when in wide angle mode. Removing the lens hood solves the problem.
Dec 11, 2014 17:24:59 #
MikeMcK wrote:
From the shape and location of the shadow, I'm guessing that the lens, or lens hood, is blocking some of the light from the flash.I have a Canon 7D, I recently bought a Canon 10-18mm IS Lens. When I set the lens to either 10mm or 12mm and take a picture with a flash there is a dark place at the bottom of the picture. See example. The dark place goes away at 14mm - 18mm. Is this a normal condition?
Dec 11, 2014 17:45:10 #
Jay Pat wrote:
Shadow from the lens when using a wide angle.
Use an external flash and the shadow will go away.
Pat
Use an external flash and the shadow will go away.
Pat
Thank you. I guess the answer use an external flash or don't try to use flash under 14mm.
Dec 11, 2014 17:46:11 #
Violameister wrote:
Are you using a lens hood? if so, take it off when using flash. I have this problem with my camera when in wide angle mode. Removing the lens hood solves the problem.
I tried it with a hood designed for that lens and without a hood, its the flash that is the issue. Thank you for your help.
Dec 11, 2014 17:49:44 #
Dan5000 wrote:
Are you using a lense hood? And is it the right hood for that lens?
I tried with and without a hood designed for that particular lens. Its the flash, because without the flash it doesn't show a shadow on the image. Thanks.
Dec 11, 2014 17:50:23 #
rehess wrote:
From the shape and location of the shadow, I'm guessing that the lens, or lens hood, is blocking some of the light from the flash.
You are right, its the flash, thanks.
Dec 11, 2014 17:51:13 #
Linda From Maine wrote:
Interesting! I have the same lens for my T3i and was able to duplicate your issue. Guess we can't use the on-camera flash with that lens :|
You can't use 10mm or 12mm, the shadow disappears at 14mm or as somebody suggested use an external flash. Actually at a focal length of 10-12mm the on board flash isn't much good anyway.
Dec 11, 2014 18:37:15 #
You will also notice in the sample image that you provided that the flash doesn't cover the full angle of view of a lens that wide as there is light falloff along both sides.
A flash diffuser may help with that.
A flash diffuser may help with that.
Dec 11, 2014 18:56:48 #
MikeMcK wrote:
I have a Canon 7D, I recently bought a Canon 10-18mm IS Lens. When I set the lens to either 10mm or 12mm and take a picture with a flash there is a dark place at the bottom of the picture. See example. The dark place goes away at 14mm - 18mm. Is this a normal condition?
I think the rules of physics and common sense apply. Light mostly travels in straight lines, and with wide angle lenses things sometimes get in the way or into the field of view.
On the other hand, if you find you no longer have a shadow you may be in more trouble than you can handle....
Dec 11, 2014 21:18:06 #
The shadow at the bottom of the frame is from the lens. The darkening around the edges is due to the built-in flash not covering wider than around a 17mm lens. An accessory flash will prevent the lens shadow. A diffuser on the accessory flash will prevent the darkening around the edges. Bounce flash with the accessory flash will solve both problems and give a nicer light.
Dec 12, 2014 09:52:35 #
MarkD wrote:
The shadow at the bottom of the frame is from the lens. The darkening around the edges is due to the built-in flash not covering wider than around a 17mm lens. An accessory flash will prevent the lens shadow. A diffuser on the accessory flash will prevent the darkening around the edges. Bounce flash with the accessory flash will solve both problems and give a nicer light.
(Y)
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