01-04-2015, 09:22 AM
Joju, thank you for the quick and very accurate reply and for the links provided.
You are right I used a wrong wording the two lens have the same FOV what is different is the focal length range.
I agree with most of your considerations but what is confusing me is the different results given by different testers. For example, optical characteristics such as distorsion, vignetting, resolution should be resonably the same for all, while photozone provide much better values for tamron (for this specific characteristics) while lenscore considers better the same optical characteristics of sigma.
In addition, regarding the photozone resolutions diagrams, please also consider that they use different scale for the two lens (i.e. from 1300 to 4000 lw/ph for the tamron and from 1200 to 3700 lw/ph for the sigma), If you put the numerical value in an excel sheet and compare the performance of the two lens in a single diagram using the same scale the difference is more evident.
Looking at the numbers measured by photozone do you believe that our eyes can normally perceive such difference?
Is there someone who has tested both lens and can provide his impression?
Thank you again
You are right I used a wrong wording the two lens have the same FOV what is different is the focal length range.
I agree with most of your considerations but what is confusing me is the different results given by different testers. For example, optical characteristics such as distorsion, vignetting, resolution should be resonably the same for all, while photozone provide much better values for tamron (for this specific characteristics) while lenscore considers better the same optical characteristics of sigma.
In addition, regarding the photozone resolutions diagrams, please also consider that they use different scale for the two lens (i.e. from 1300 to 4000 lw/ph for the tamron and from 1200 to 3700 lw/ph for the sigma), If you put the numerical value in an excel sheet and compare the performance of the two lens in a single diagram using the same scale the difference is more evident.
Looking at the numbers measured by photozone do you believe that our eyes can normally perceive such difference?
Is there someone who has tested both lens and can provide his impression?
Thank you again