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UPDATE
The forum will be moving to a new domain in the near future (canonrumorsforum.com). I have turned off "read-only", but I will only leave the two forum nodes you see active for the time being. I don't know at this time how quickly the change will happen, but that will move at a good pace I am sure. ------------------------------------------------------------
Canon Rumors - Your best source for Canon news, rumors and creators
Dear friends and Teachers.
I have go back to Photography school/ Local Technical College more than 15 Classes in past 8 years, Start from The Beginning of Photography---To the Advance Photography, Wedding Photography and Studio Light Photography.
Many of my dear teacher teach me that, Most of the Lenses in this world have a sweet spot F. stop between F = 5.6 to 11.0, And the best sharpest corner to corner = F 8.0 , That Why Canon company use F/8.0 as the Blue Curve Line on their MTF chart, and Compare to the Most not too sharp in Black Curve line at the Maximum/ Widest aperture ---as the Black Curve Line on MTF chart.
---- QUOTE from Canon "
Here’s a breakdown of how to identify the different curves in a Canon MTF chart:
Black curve lines: lens performance at maximum, widest aperture.
Blue curve lines: MTF curves with lens stopped-down to f/8.
Thick lines: MTF data showing contrast — measured with thicker line sets on test target.
Thin lines: MTF resolution data — tests measure performance rendering thinner lines on test target.
Dashed lines: Lens’s MTF performance with harder-to-reproduce Meridional line sets.
Solid lines: MTF performance with Sagittal lines, arranged parallel to a diagonal from image center to corner."
And from the link:
http://www.learn.usa.canon.com/resources/articles/2013/reading_MTF_charts.shtml
Yes, I know that all MFG.s use difference MTF chart and difference setting, BUT, THE QUESTION IS =as my teachers teach me that Most of the Lenses , have the Best Sweet spot/ Sharpest F. Stop at 8.0 ----That still True ???.
Thanks you, Sir/ Madam.
Surapon
I have go back to Photography school/ Local Technical College more than 15 Classes in past 8 years, Start from The Beginning of Photography---To the Advance Photography, Wedding Photography and Studio Light Photography.
Many of my dear teacher teach me that, Most of the Lenses in this world have a sweet spot F. stop between F = 5.6 to 11.0, And the best sharpest corner to corner = F 8.0 , That Why Canon company use F/8.0 as the Blue Curve Line on their MTF chart, and Compare to the Most not too sharp in Black Curve line at the Maximum/ Widest aperture ---as the Black Curve Line on MTF chart.
---- QUOTE from Canon "
Here’s a breakdown of how to identify the different curves in a Canon MTF chart:
Black curve lines: lens performance at maximum, widest aperture.
Blue curve lines: MTF curves with lens stopped-down to f/8.
Thick lines: MTF data showing contrast — measured with thicker line sets on test target.
Thin lines: MTF resolution data — tests measure performance rendering thinner lines on test target.
Dashed lines: Lens’s MTF performance with harder-to-reproduce Meridional line sets.
Solid lines: MTF performance with Sagittal lines, arranged parallel to a diagonal from image center to corner."
And from the link:
http://www.learn.usa.canon.com/resources/articles/2013/reading_MTF_charts.shtml
Yes, I know that all MFG.s use difference MTF chart and difference setting, BUT, THE QUESTION IS =as my teachers teach me that Most of the Lenses , have the Best Sweet spot/ Sharpest F. Stop at 8.0 ----That still True ???.
Thanks you, Sir/ Madam.
Surapon