Hello all,
I'm after some advice regarding the below Lenses please.
Camera EOS 6D. All shots taken with manual focus 10X live view, @ f/6.3 Aperture Priority
Lens 1 - Canon EF 100mm 2.8 Macro
Lens 2 - Canon EF 50mm 2.8 II
Lens 3 - Canon EF 50mm 2.8 STM
Lens 4 - Canon EF 50mm 1.4
Lens 5 - Canon EF 28mm 2.8
I've been dissapointed at the sharpness of my 28mm 2.8 (Lens 5), so decided to print out a star chart and take some test photos with a few of my lenses to compare. Now first off, my printer isn't that good, so the star chart is less than optimal. Its a sheet of A4 at around 1m distance from camera. Two flashes at 45 degrees.
Lens 1 - The 100mm Macro. This seems to do a pretty good job. You can see individual dots. I'm using this as my standard to compare the other lenses to.
Lens 2 - The 50mm 2.8 II - Am I expecting too much of the 50 here?
Lens 3 - The 50mm 2.8 STM - Pretty much the same as the 50mm 2.8 II.
Lens 4 - The 50mm 1.4 - Well, I dont see much difference to the other 50's
Lens 5 - The 28mm 2.8. Urghhhhh
I've got a few questions.
As the three 50mm's are about the same, would that indicate that that's about as much as I would be able to get from them, or does it indicate that all three have issues.
The 28mm, well, this has had the front element off and back on again. I tried the trick in the service manual to use paper guides to center the element, which it says can get you close if you don't happen to have a collimator/lens projector handy, but not spot on, but it doesn't seem to matter what I do with the front element, i get no difference in the image quality. Is this pointing at something more substantial. There isn't much that can go wrong with these is there? There are only two groups, fixed together
I tried shooting just out of focus to see if I had any decentering indications on the 28mm, but it looked rock solid.
Am i not comparing the same thing with the same pictures. Should I be moving the camera closer as the focal length gets shorter in order to compare the same thing?
Please don't shoot me down. I don't have much money and tend to collect "cheap" lenses from eBay, so I'm happy to accept the fact that I have a shelf full of duffers. I'm not a professional, just like collecting tech, with a view to sparking off a new hobby.
Thanks for any advice you can give me. Including chuck that 28mm in the bin!
I'm after some advice regarding the below Lenses please.
Camera EOS 6D. All shots taken with manual focus 10X live view, @ f/6.3 Aperture Priority
Lens 1 - Canon EF 100mm 2.8 Macro
Lens 2 - Canon EF 50mm 2.8 II
Lens 3 - Canon EF 50mm 2.8 STM
Lens 4 - Canon EF 50mm 1.4
Lens 5 - Canon EF 28mm 2.8
I've been dissapointed at the sharpness of my 28mm 2.8 (Lens 5), so decided to print out a star chart and take some test photos with a few of my lenses to compare. Now first off, my printer isn't that good, so the star chart is less than optimal. Its a sheet of A4 at around 1m distance from camera. Two flashes at 45 degrees.
Lens 1 - The 100mm Macro. This seems to do a pretty good job. You can see individual dots. I'm using this as my standard to compare the other lenses to.
Lens 2 - The 50mm 2.8 II - Am I expecting too much of the 50 here?
Lens 3 - The 50mm 2.8 STM - Pretty much the same as the 50mm 2.8 II.
Lens 4 - The 50mm 1.4 - Well, I dont see much difference to the other 50's
Lens 5 - The 28mm 2.8. Urghhhhh
I've got a few questions.
As the three 50mm's are about the same, would that indicate that that's about as much as I would be able to get from them, or does it indicate that all three have issues.
The 28mm, well, this has had the front element off and back on again. I tried the trick in the service manual to use paper guides to center the element, which it says can get you close if you don't happen to have a collimator/lens projector handy, but not spot on, but it doesn't seem to matter what I do with the front element, i get no difference in the image quality. Is this pointing at something more substantial. There isn't much that can go wrong with these is there? There are only two groups, fixed together
I tried shooting just out of focus to see if I had any decentering indications on the 28mm, but it looked rock solid.
Am i not comparing the same thing with the same pictures. Should I be moving the camera closer as the focal length gets shorter in order to compare the same thing?
Please don't shoot me down. I don't have much money and tend to collect "cheap" lenses from eBay, so I'm happy to accept the fact that I have a shelf full of duffers. I'm not a professional, just like collecting tech, with a view to sparking off a new hobby.
Thanks for any advice you can give me. Including chuck that 28mm in the bin!
