Why isn't it sharp mark III
Mar 4, 2017 03:44:10 #
stevenh0027
Loc: Melbourne Australia
Hi all,
You may remember that I have posted twice asking why my photos arn't sharp.
I got heaps of good advice.
Here aer a couple of photos to show what I have learn't.
Basically it has a lot to do with technique.
The first two photos were taken with the camera (Canon 60d) mounted on a tripod.
Both shots were taken with the mirror up and the self timer set to reduce camera movement.
The first is using the EF 75-300mm kit lens (this lens has no image stabilisation).
The second was taken with a Tamron SP70-300mm F/4-5.6 Di VC USD (the image stabilisation was turned off).
In my opinion both shots are equally sharp.
It interesting to note there is some colour variation.
Also both shots were with Aperture priority (F8) ISO 250. The Canon selected 1/400 the Tamron 1/250.
The Canon is 58mm diameter and the Tamron is 62mm diameter. Why would the Canon lens need less light?
The last shot of the Koala was taken with the Tamron with image stabilisation on. Speed was 1/100 F8 at 300mm magnification.
I thik it is also pretty sharp. I never would have got such a sharp shot with the unstabilised Canon lens.
You may remember that I have posted twice asking why my photos arn't sharp.
I got heaps of good advice.
Here aer a couple of photos to show what I have learn't.
Basically it has a lot to do with technique.
The first two photos were taken with the camera (Canon 60d) mounted on a tripod.
Both shots were taken with the mirror up and the self timer set to reduce camera movement.
The first is using the EF 75-300mm kit lens (this lens has no image stabilisation).
The second was taken with a Tamron SP70-300mm F/4-5.6 Di VC USD (the image stabilisation was turned off).
In my opinion both shots are equally sharp.
It interesting to note there is some colour variation.
Also both shots were with Aperture priority (F8) ISO 250. The Canon selected 1/400 the Tamron 1/250.
The Canon is 58mm diameter and the Tamron is 62mm diameter. Why would the Canon lens need less light?
The last shot of the Koala was taken with the Tamron with image stabilisation on. Speed was 1/100 F8 at 300mm magnification.
I thik it is also pretty sharp. I never would have got such a sharp shot with the unstabilised Canon lens.
Mar 4, 2017 04:25:07 #
I am happy for you. Keep improving.
Now you can start focusing on small details like the purple/green fringing in your shots. I am guessing that you are shooting JPEG? Either way, if you have a decent processing program, it would let you eliminate those in a quick second.
GL!
Now you can start focusing on small details like the purple/green fringing in your shots. I am guessing that you are shooting JPEG? Either way, if you have a decent processing program, it would let you eliminate those in a quick second.
GL!
stevenh0027 wrote:
Hi all, br You may remember that I have posted twi... (show quote)
Mar 4, 2017 06:28:34 #
Mar 4, 2017 06:33:39 #
Clearly, you've gotten better, sharpish (as they say). And, BTW, I don't detect any hint of color fringing after downloading each of the three shots on the Retina screen of my iPad Pro. Congratulations! Now maybe it's time to focus on something a bit more curvy than a telephone/power pole.
Mar 4, 2017 06:47:40 #
stevenh0027 wrote:
.
Also both shots were with Aperture priority (F8) ISO 250. The Canon selected 1/400 the Tamron 1/250.
The Canon is 58mm diameter and the Tamron is 62mm diameter. Why would the Canon lens need less light?
.
Also both shots were with Aperture priority (F8) ISO 250. The Canon selected 1/400 the Tamron 1/250.
The Canon is 58mm diameter and the Tamron is 62mm diameter. Why would the Canon lens need less light?
.
Were you using a polarized filter on the Tameron and not on the Canon? By rotating the filter to defuse light calls for a longer exposure !
Mar 4, 2017 07:26:55 #
stevenh0027 wrote:
Hi all, br You may remember that I have posted twi... (show quote)
The Tamron shot is clearly more exposed than the Canon shot. That doesn't explain why the camera selected 1/250 for the Tamron unless the focus position shifted and the camera was picking up on a brighter point in the frame.
Mar 4, 2017 08:13:43 #
The Tamron shot appears to be zoomed in a bit more than the Canon or the images were framed different. Either could account for a difference in meter settings.
Bill
Bill
Mar 4, 2017 10:44:58 #
rjaywallace wrote:
Clearly, you've gotten better, sharpish (as they say). And, BTW, I don't detect any hint of color fringing after downloading each of the three shots on the Retina screen of my iPad Pro. Congratulations! Now maybe it's time to focus on something a bit more curvy than a telephone/power pole.
I am looking on a 5k Imac - The fringing is there. Time to see the eye doctor.
Mar 4, 2017 10:52:32 #
tdekany wrote:
I am looking on a 5k Imac - The fringing is there. Time to see the eye doctor.
I see quite a bit on my iPad.
Mar 5, 2017 07:02:58 #
DIY should keep everyone busy for a while.
http://www.bobatkins.com/photography/technical/focus_testing.html
http://bobatkins.com/photography/technical/lens_sharpness.html
https://petapixel.com/2013/03/12/ghettoca-a-diy-lens-calibration-tool-for-micro-adjustment-enabled-dslrs/
http://www.kscameraclub.org/docs/pdfs/focus_test_chart_edited.pdf
https://www.google.com/search?q=test+focus+chart&espv=2&biw=1680&bih=920&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwiRtKj_or_SAhVDz2MKHcw8AUcQsAQINQ
https://www.bhphotovideo.com/explora/photography/tips-and-solutions/how-test-your-lens
http://www.bobatkins.com/photography/technical/focus_testing.html
http://bobatkins.com/photography/technical/lens_sharpness.html
https://petapixel.com/2013/03/12/ghettoca-a-diy-lens-calibration-tool-for-micro-adjustment-enabled-dslrs/
http://www.kscameraclub.org/docs/pdfs/focus_test_chart_edited.pdf
https://www.google.com/search?q=test+focus+chart&espv=2&biw=1680&bih=920&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwiRtKj_or_SAhVDz2MKHcw8AUcQsAQINQ
https://www.bhphotovideo.com/explora/photography/tips-and-solutions/how-test-your-lens
Mar 5, 2017 09:59:21 #
You say the first 2 shots were taken while on a tripod. Does that mean that the shot of the Koala was taken hand held? If so, the Canon without stabilisation could have taken a decent shot if the Shutter speed was increased. That you got a decent shot with the Tamron at 300mm and 1/100 shutter speed shows that your technique has improved much. The standard rule is the shutter speed should be the reciprical of the focal length.
Walt
Walt
Mar 5, 2017 10:13:36 #
I think it is common for lenses from different manufacturers to have differences in coloring. Maybe one reason to stick with lenses from the same manufacturer. Probably would not eliminate it but probably less variation. Years ago Vivitar lenses seemed very blue to me compared with my Canon lenses. There have been many variations over the years. This can be caused by the glass, the coatings, whatever.
Mar 5, 2017 12:17:34 #
I agree with Steven if your have a polarizer filter on both lenses that could be causing some of the variance issues.
Mar 5, 2017 13:27:11 #
You probably could have gotten the last one even sharper if you had used a faster shutter. If you shoot at 250mm you should be using a shutter of at least 1/250th hand held. You shot at 1/100th. The picture is sharp enough, but could be even sharper.
Mar 5, 2017 13:42:48 #
If you want to reply, then register here. Registration is free and your account is created instantly, so you can post right away.