Question about lens sharpness.
Mar 24, 2016 16:40:56 #
This is a what if question. Someone out there might have done this.
Take a theoretical lens. Say a 28-300mm super zoom made by the maker of your choice. Testing shows that it is sharp in the center, but soft in the corners. Now take that lens and put it on a crop sensor body. The center should be sharp, and the corners should just be OK. What if it were put on a four thirds body via adapter, would the image be sharp overall?
Tried search for the answer. If it is out there, someone please just post the link.
Take a theoretical lens. Say a 28-300mm super zoom made by the maker of your choice. Testing shows that it is sharp in the center, but soft in the corners. Now take that lens and put it on a crop sensor body. The center should be sharp, and the corners should just be OK. What if it were put on a four thirds body via adapter, would the image be sharp overall?
Tried search for the answer. If it is out there, someone please just post the link.
Mar 24, 2016 16:49:39 #
hannaco wrote:
This is a what if question. Someone out there mig... (show quote)
It would stand to reason that the crop sensor camera would be using the center portion of the projected image. That area used is the sharper, per your description, portion of the image circle. So, one would expect that the entire image would be sharp.
--Bob
Mar 24, 2016 17:00:36 #
Yes, it is true between an FX body and a DX body. I compared images taken with a 18-35 lens on a D700 and on a D7000. Images shot wide open at 18mm with the D700 were slightly soft in the corners, although you had to pixel peep to see it. When that lens was used on a D7000 the softening of the corners was much less obvious - in fact in most cases impossible to see. I have not done a comparison with M43 but I expect the same would apply.
Mar 24, 2016 21:58:17 #
mcveed wrote:
I have not done a comparison with M43 but I expect the same would apply.
This is why a lot of m4/3 users like to adapt lenses...by adapting we use the best (central) part of the lens.
Mar 24, 2016 23:36:36 #
Mar 25, 2016 01:15:55 #
Cdouthitt wrote:
This is why a lot of m4/3 users like to adapt lenses...by adapting we use the best (central) part of the lens.
Clint, Are you saying that I will get better pictures with my GX8 and my Nikon 300mm f2.8 than I did with the D750? I must experiment tomorrow.
Mar 25, 2016 03:03:03 #
hannaco wrote:
This is a what if question. Someone out there mig... (show quote)
At some point the need to enlarge the image for viewing would negate any sharpness advantage of the lens center.
Mar 25, 2016 05:44:42 #
mcveed wrote:
Clint, Are you saying that I will get better pictures with my GX8 and my Nikon 300mm f2.8 than I did with the D750? I must experiment tomorrow.
No. Only that the gx8 will only use the center part of the glass
Mar 25, 2016 06:23:24 #
Mar 25, 2016 06:46:48 #
billnikon
Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont
mcveed wrote:
Clint, Are you saying that I will get better pictures with my GX8 and my Nikon 300mm f2.8 than I did with the D750? I must experiment tomorrow.
And what about your 300 2.8 on the new D500. OH BOY.
Mar 25, 2016 07:48:46 #
Mark7829
Loc: Calfornia
hannaco wrote:
This is a what if question. Someone out there mig... (show quote)
Checkout this video and your answer is about mid way through it
http://www.youtube.com/watch?v=YDbUIfB5YUc
The answer is NO
Mar 25, 2016 09:22:20 #
hannaco wrote:
This is a what if question. Someone out there mig... (show quote)
Well, it would be more *consistently* sharp, but overall performance actually declines. To make a full frame lens actually perform better on a smaller format sensor, you need a MetaBones SpeedBooster. It REDUCES focal length by .71x or .64x, while giving you one or 1-1/3 stops MORE light, and IMPROVED MTF performance. It is not cheap, but it really works.
Mar 25, 2016 09:35:41 #
Mark7829 wrote:
Checkout this video and your answer is about mid way through it
http://www.youtube.com/watch?v=YDbUIfB5YUc
The answer is NO
http://www.youtube.com/watch?v=YDbUIfB5YUc
The answer is NO
Thank you for the link,definitely worth watching!
Mar 25, 2016 09:56:29 #
Mar 25, 2016 10:26:34 #
Mark7829
Loc: Calfornia
rmalarz wrote:
It would stand to reason that the crop sensor camera would be using the center portion of the projected image. That area used is the sharper, per your description, portion of the image circle. So, one would expect that the entire image would be sharp.
--Bob
--Bob
Check out http://www.youtube.com/watch?v=YDbUIfB5YUc
by Tony Northrup.
I love this site with all the experts who use their own limited experience and limited gear who come up with universal explanations which then is applied to all other situations. Thank god that is not true. As much as we love to simplify and therefore make easier to understand, if is often much more complex. If cameras were just pin hole devices, it could be that simple but it is not.
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