Hi,
Just got 800 f/5.6 Canon and found clear sky or clean background shows vignetting prominent.
Does anyone face issue and how to resolve ?
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Hi,
Just got 800 f/5.6 Canon and found clear sky or clean background shows vignetting prominent.
Does anyone face issue and how to resolve ?
Never noticed that to be any issue at all with mine. I just went out and shot up into a clear blue sky wth a full frame sensor and light falloff looks to be very well controlled on my copy of this lens.Quote:
Originally Posted by Mital Patel
You might want to post an image to show what you're seeing. To even notice it with the 800mm has me scratching my head...
here is the thumb screen shot what it appears on thumbnails.
Here is actual image shows heavy vignet dark round on outer area from center.
Mital,
I'm presuming you are using a full-frame sensor camera? I have had a similar issue with the Canon 600mm using a FF body. It's easily correctable and I've never considered it a real hindrance. My guess is that will only be seen with a full-frame sensor. A 1.3x or 1.6 cropped sensor should not show vignetting at all.
Alan
i've used this lens on 1D Mk IV. not yet on my 7D which i'll test out this weekend.Quote:
Originally Posted by Alan Stankevitz
There should be no vignetting at 7.1 even on a full frame senor at 5.6 a little but at 7.1 I would be concern also the screen shot you posted is under exposed which would make it even more evident how about posting a uncorrected jpeg for us to look at.
Quote:
Originally Posted by Don Lacy
Don this is unCorrected RAW display. i have not touched any raw parameters in ACR just showed as is launched in ACR
Mital,
If you have a 35 mm EOS film camera, put the lens on the film camera and open the back of the camera with the shutter open. Point the lens a a uniform target, e.g. wall or sky and look at the lens through the back of the camera (where the film would go) holding your eye very close to the film plane. Can you see the entire lens opening from center to corners? If not stop down (if camera has a depth of field preview button) and repeat. Find the f/stop where you can see the full circle to the edge of the frame (with your eye up close to the film plane). This is a good reason to keep an old film camera (can't sell it for much anyway).:w3
Roger
Its kind of hard seeing whats going on from a screen shot open the raw image leave it at the defaults open it in PS downsize it for the web and post a 1024 image we can look at. Also take some images of a clear sky starting at 5.6 and work your way to f/16 see if the vignetting goes away as you work your way to f/16. But to be honest you really should not have any on a crop camera even at 5.6 let alone 7.1Quote:
Originally Posted by Mital Patel
Mital, I read a few reviews online on the 800mm and they all report a slight amount of vignetting at f/5.6 and non at f/8 on full frame sensors. If you have significant issues then you should return the lens if possible and have it replace or send it in to Canon to have it checked out.
was checking up same days files and found the vignetting issue appears very heavy at f/5.6 and gradually reduce over to the f/8 and f/9 it is seriously noticeable but then also its visible.
now question is how to correct that in PS or any other tool.
also i found the expo was -1/3 while taking those shots as the 1D Mk IV was set to its full brightest which shows still 1 stop over exposed to my calibrated mac which seem to be almost near to expo i've been posting here processed images on avian.
so i assume the 1D Mk IV is set properly to its full brightness so i can check expo on screen and set accordingly.
i know i have been using 500 since 3 years and handling 800 is tricky being it f/5.6 and 300mm more focal length and i found exposure white it is grabbing more light than 500 f/4 so i have to get the expo down to what i used to with 500.
please guide technically here for this setup so i can not waste my this weekend's trip to coastaline.
Mital
I don't see any evidence of Vignetting using the 800mm with either of the two 1DMkIV bodies.
I'll have to image a blue sky when the weather clears (I am up in rainy Northwest part of U.S.) and do a final check, but I'm just not seeing it in any work so far which includes blue sky.
I strongly suggest you return your lens and exchange it; if not possible, then the nearest Canon service center for a check and adjustment. It may be that you have a lens element that isn't properly seated in the system - it would have to have shifted after quality checks as this is unusual.
Artie also uses the same equipment lineup -- he's a real stickler on image quality - so we would have heard about such problems (and we appreciate this very much!).
Sorry to hear you are having these problems. I know it was exciting two years ago when I finally took delivery of mine after waiting months. I would have been very disappointed to have such image problems. I know you are also.
Hope you get it fixed soon.
Regards
Don
Hi Mital,
I have used the 800 f5.6 on my 1Dmk4 and 1Dmk3 on birds and not really noticed any vignetting at all.
Grant
To correct vignetting in ACR go to the lens correction tab select manual and move the vignetting slider to the right but you should not be seeing any vignetting from the 800 on your 1D Mk IV if you're seeing it there is something wrong with the lens and you should have it replaced or fixed.Quote:
Originally Posted by Mital Patel
I really do not understand the rest of your question you should not be trying to determine correct exposure from looking at the LCD screen to see if its bright enough you should be reading the histogram to see if you have the right exposure for what you're photographing. Also the lens makes no difference if the correct exposure for your subject is 1/500 at f/8 with ISO 400 then as long as you use those settings the image will be exposed correctly no matter what lens you use from a 24 mm to the 800 mm. Now the metering compensation needed to get to 1/500 at f/8 might be different if shooting in aperture using evaluative metering with each lens but the correct exposure settings will not change.
Here is the exif details of the same image.
File Name IMG_3674.CR2
Camera Model Canon EOS-1D Mark IV
Firmware Firmware Version 1.0.8
Shooting Date/Time 01/08/12 09:59:03
Owner's Name
Shooting Mode Aperture-Priority AE
Tv( Shutter Speed ) 1/6400
Av( Aperture Value ) 7.1
Metering Mode Evaluative Metering
Exposure Compensation -2/3
ISO Speed 800
Auto ISO Speed OFF
Lens EF800mm f/5.6L IS USM
Focal Length 800.0mm
Image Size 4896x3264
Image Quality RAW
Flash Off
FE lock OFF
White Balance Mode Color Temperature(5300K)
AF Mode AI Servo AF
AF Microadjustment 0
Picture Style User Defined 3(Standard)
Sharpness 3
Contrast 0
Saturation 0
Color tone 0
Color Space sRGB
Long exposure noise reduction 1:Auto
High ISO speed noise reduction 3:Disable
Highlight tone priority 1:Enable
Auto Lighting Optimizer Disable
Peripheral illumination correction Enable
Dust Delete Data No
File Size 18874KB
Drive Mode Low-speed continuous shooting
Live View Shooting OFF
============================
I just realised that i exposed image by -2/3 .. which introduced more shadows and darker image on screen and it was looking quite good on lcd.
yes its right i should not follow the LCD image for correct exposure instead using Histo is the method. somehow i had no issues using that method with 500 but since 800 came in i've got this problem understanding it.
i will sure call canon which is unavailable in my city seems i've to talk to country center. just that i want to be clear if i am doing mistake or the lens has got issue ?
Mital,
Per your email, I asked my friend Luis Villabalanca that has a 800 to shoot a blue sky test at f/8 for you (we were shooting together today). Your sample is underexposed so by looking at it I can't really say it has much vignetting but looking at Luis's sample that was deliberately underexposed as well it seems to me that your lens is fine. plus you can easily correct vignetting in PS. The only thing I'd be really concerned is if the lens is not sharp...you may want to send your samples to CPS and ask them to verify as well just to be sure.
As per other questions please send me an email with clear explanation of what your problem is so I can help
Best,
Arash
even i was using 7d, 500 and found two waterfowl image i clicked in open sky at f/4 on 500 shows the falloff dark surround lightly visible.
looks like have to take few more test. because if its on grounded i dont see that problem having clutter bg or clean brown bg on stationary subjects on full light.
Here the exif Follows
File Name IMG_3385.CR2
Camera Model Canon EOS-1D Mark IV
Firmware Firmware Version 1.0.8
Shooting Date/Time 01/07/12 10:36:42
Owner's Name
Shooting Mode Aperture-Priority AE
Tv( Shutter Speed ) 1/5000
Av( Aperture Value ) 7.1
Metering Mode Spot Metering
Exposure Compensation 0
ISO Speed 800
Auto ISO Speed OFF
Lens EF800mm f/5.6L IS USM
Focal Length 800.0mm
Image Size 4896x3264
Image Quality RAW
Flash Off
FE lock OFF
White Balance Mode Color Temperature(5700K)
AF Mode AI Servo AF
AF Microadjustment 0
Picture Style User Defined 3(Standard)
Sharpness 3
Contrast 0
Saturation 0
Color tone 0
Color Space sRGB
Long exposure noise reduction 1:Auto
High ISO speed noise reduction 3:Disable
Highlight tone priority 1:Enable
Auto Lighting Optimizer Disable
Peripheral illumination correction Enable
Dust Delete Data No
File Size 19040KB
Drive Mode Low-speed continuous shooting
Live View Shooting OFF
Mital in your new sample I can see the fall off but it is minor, can you post f/5.6 where it is more obvious so we can compare easier?
Thanks a lot Arash.
i tried to search seem like i havent took any. will take one and post.
Here's an image taken with the 800mm at F5.6 with a 5D2. Captured as a JPEG no post processing
so i assume that i am not having faulty lens as it seem that this happens with everyone at wide open and more at underexposed image :)
will do the field test with mine soon this weekend and post
This is similar to what we saw too...I think they all peroform similary...nothing to worry about IMO.Quote:
Originally Posted by D. Robert Franz
