Do I have a lens problem?
Dec 18, 2014 13:34:59 #
Nightski wrote:
This might sound like a silly question, but does this only happen in auto focus?
Not silly. No, it will happen in manual or AF.
Dec 18, 2014 13:55:12 #
Nightski wrote:
This might sound like a silly question, but does this only happen in auto focus?
the only place it does not occur is in live view manual focus.
There is a quick way to recognize it.
Place a stamp size black target on a window pane with daylight behind it.
Setup your tripod 20 feet away and auto focus on the edge of target using 1 spot focusing, take a shot wide open.
Unfocus the lens close and far, autofocusing on the edge and shooting after each adjustment.
All shots should appear the same. They won't and only you can decide how much error you will tolerate before demanding a refund.
Now the test:
Auto focus on the edge of the black and shoot one more time.
Go to liveview, maximum magnification and manually focus and shoot. Thats the best your rig can do.
Compare those two shots, looking at edges for blur on the auto focused shot.
If it is blurred more than the manual shot you have a problem.
Dec 18, 2014 14:16:19 #
I did take this shot of the seagull about the same time that I took the deer shot.
http://www.uglyhedgehog.com/t-254241-1.html
I sure hope I don't have a problem with my lens that can't be corrected. :-(
http://www.uglyhedgehog.com/t-254241-1.html
I sure hope I don't have a problem with my lens that can't be corrected. :-(
Dec 18, 2014 15:06:58 #
Sandra asked that I post this for her, it shows her focus points.
Dec 18, 2014 15:07:21 #
Nightski wrote:
I shot this with my Sigma 150-500mm F/5.0-6.3 . Can anyone tell for sure what is going on here? Is it me or the lens or the situation?
To answer this question will take testing on your part with (your) lens. How other owners of this lens achieve success probably won't work for your lens. I feel that the Sigma 150-500 is a very temperamental lens. The autofocus seems to be very inconsistent, in my experience.
Nightski wrote:
Your response from the Critique section photo.Yes, I should have used manual focus. Auto focus was too undependable with moving grass in front of me
I think you may find that manually focusing this lens is even more difficult than learning the limitations of the lens.
Dec 18, 2014 15:18:05 #
naturepics43 wrote:
Your response from the Critique section photo.
I think you may find that manually focusing this lens is even more difficult than learning the limitations of the lens.
I think you may find that manually focusing this lens is even more difficult than learning the limitations of the lens.
Often we all expect too much from our equipment, learning and working within it's limitations is the secret to a long and stress free life.
Dec 18, 2014 15:20:18 #
Graham Smith wrote:
Often we all expect too much from our equipment, learning and working within it's limitations is the secret to a long and stress free life.
Boy, you got that right :)
Dec 18, 2014 15:37:10 #
Dngallagher wrote:
Boy, you got that right :)
Perhaps I should toss away my cameras and take up philosophy instead? :D
Dec 18, 2014 16:00:26 #
Graham Smith wrote:
Perhaps I should toss away my cameras and take up philosophy instead? :D
Definitely not!! You can do both! ;)
Dec 18, 2014 16:04:24 #
Nightski wrote:
Definitely not!! You can do both! ;)
And computer lessons? :lol:
Dec 18, 2014 16:06:34 #
Graham Smith wrote:
Perhaps I should toss away my cameras and take up philosophy instead? :D
and waste that talent?
no way dude.
Dec 18, 2014 16:12:17 #
oldtigger wrote:
and waste that talent?
no way dude.
no way dude.
So now I have to learn how to multi-task? :-D
Dec 18, 2014 16:48:04 #
Well Nightsky, here is the thing - if you use this lens - in order to maximize IQ, you should be doing a micro focus adjust with your camera body and hopefully your camera body supports micro focus adjust. The New Sigma lenses with the USB dock allow those lenses to be adjusted to ANY body through the lens and not the body. Otherwise, the best performance from this lens is probably f9 and 440mm .......from a very stabilised support.
Dec 19, 2014 07:32:48 #
here is a sample of the lens front and back focus chart that I use that one of the members pointed out you may have to use to check your lens , or lenses . I check every lens I have and buy used or new after I attach it to my camera . My canon 7D has a setting that will allow me to adjust each lens to my camera and remember that setting each time I attach that lens or any other one which doesn't effect the settings I made for all the other lenses . You can use this chart or one of many others that can be found on the web , along with instructions . And if you use your lenses alot , or bump them on something now and then , you should recheck that the focus point is still good .Tommy
Dec 19, 2014 08:16:22 #
What was your focus setting on? Was it for a single focus point in the center of the frame? It looks like the camera focused on the blade of grass to the right of the deer and not on the deer. If you are using multiple focus points, this can happen. The camera assumes you want to focus on the nearest object.
So, I think the problem is user error and not something wrong with the lens. It happens. I owned a studio for a number of years and later worked for two different newspapers, and have been involved in photography both as an amateur and professional for over four decades, and user error has happened more often than I like to admit.
So, I think the problem is user error and not something wrong with the lens. It happens. I owned a studio for a number of years and later worked for two different newspapers, and have been involved in photography both as an amateur and professional for over four decades, and user error has happened more often than I like to admit.
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