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Black Vignetting @ 18mm on Sigma 18-250 F3.5-6.3 Lens
Dec 2, 2014 09:58:18 #
AZNikon
Loc: Mesa, AZ
Has anyone had this happen? At one point I did put the lens hood on but don't recall if I had it on when these were shot. I'm thinking that perhaps this lens has a tendency to vignette at 18mm. At this point I'm getting a little punchy about using a lens hood at all. Constructive comments welcome. Thanks, Bob
Dec 2, 2014 10:05:19 #
Very odd that the darkness is only in two corners. Almost suggests that the hood was put on crooked.
Dec 2, 2014 10:05:29 #
The vignetting could be caused by not having the lens hood properly mounted, if in fact you're using one, or it could be a filter ring, if you have one mounted, that is the cause.
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Dec 2, 2014 10:12:14 #
bobbennett wrote:
Has anyone had this happen? At one point I did put the lens hood on but don't recall if I had it on when these were shot. I'm thinking that perhaps this lens has a tendency to vignette at 18mm. At this point I'm getting a little punchy about using a lens hood at all. Constructive comments welcome. Thanks, Bob
Reviews show that this is an expected shortcoming. I googled "Vignetting @ 18mm on Sigma 18-250 F3.5-6.3 Lens " and the following pertinent paragraph showed up:
"Vignetting (corner darkening) is pretty well controlled, especially at mid focal lengths. Its strongest at 18mm and 250mm where the corners are around a stop darker than the center with the lens wide open. Stopping down a stop reduces vignetting to under 1/2 stop, even at the focal length extremes."
[url http://photo.net/reviews/sigma-18-250-os-review/url]
Dec 2, 2014 10:16:20 #
jsturges wrote:
Reviews show that this is an expected shortcoming.... (show quote)
http://photo.net/reviews/sigma-18-250-os-review
I fixed your link, it would not work
Dec 2, 2014 10:18:25 #
Redhogbill -- You are obviously a gentleman and a scholar, as well as being familiar with how the html works on the site. Thanks!
Dec 2, 2014 10:20:30 #
jsturges wrote:
Redhogbill -- You are obviously a gentleman and a scholar, as well as being familiar with how the html works on the site. Thanks!
gentleman and a scholar is a stretch, but thank you!!
:D
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Dec 2, 2014 10:28:40 #
jsturges wrote:
Redhogbill -- You are obviously a gentleman and a scholar, as well as being familiar with how the html works on the site. Thanks!
As Redhogbill demonstrated- just copy & paste the link w/o adding any more [url] stuff and you'll be fine.
http://photo.net/reviews/sigma-18-250-os-review
If it's a secure site, it will have httpS Remove the "s" to make the link active.
The prompt to the left isn't exactly intuitive but it can be used to simplify how a link shows up.
The link for the Photo.net site is HERE
Dec 2, 2014 10:31:45 #
RWR
Loc: La Mesa, CA
jsturges wrote:
Reviews show that this is an expected shortcoming.... (show quote)
Vignetting in two corners only is an UN-expected shortcoming. I suspect an incorrectly attached hood, as suggested above.
Dec 2, 2014 11:52:39 #
I saw a less pronounced effect just a few days ago. No lens hood on. Thanks jsturges for the info!
Dec 3, 2014 06:56:10 #
Had this happen sometime ago. Without realising it , I had not turned the lens cap all the way on fitment to the lens and the end result was as in your photos.
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Dec 3, 2014 07:50:00 #
This is way more than one stop of vignetting, and only two corners. Something was in the way. Lens hood twisted?
Dec 3, 2014 08:10:04 #
AZNikon
Loc: Mesa, AZ
I think you are right. It seems every time I try to use the lens hood I have this problem no matter how careful I am. I'm thinking just leave it at home and probably never see this problem again. I question the benefits of the lens hood anyway even though I have seen some on the Hog swear by them. Thanks, Bob
DGAG wrote:
Had this happen sometime ago. Without realising it , I had not turned the lens cap all the way on fitment to the lens and the end result was as in your photos.
Dec 3, 2014 12:18:24 #
preachy wrote:
Very odd that the darkness is only in two corners. Almost suggests that the hood was put on crooked.
Agreed. That lens uses a "petal" type hood. The longer parts of the hood should be on top and bottom, and it looks like it was not correctly installed. Don't give up on hoods. I became a believer when a broken plastic hood saved a $700 lens from damage.
Dec 3, 2014 14:57:06 #
philz
Loc: Rockaway Township NJ
Definitely the hood. I have hundreds of shots taken at 18 mm and f/3.5 with this lens, most with the lens hood on, and there is no vignetting at all that I can notice. As recently as yesterday.
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