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Old Apr 19, 2005, 12:58 AM   #11
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Awesomeness, NHL

It took me a few tries but I finally managed to get the gist of MTF charts :roll:

But I do think that real experience would be the best result... even when it can turn out ot be biast...

...Now I want to get the 17-85mm, again :?
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Old Apr 19, 2005, 3:30 AM   #12
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BoYFrMSpC wrote:
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Is there a tutorial around to learn how to read these charts? :?:

Or just say what the y and x axis represent that would help, too...

:-)
This one is very useful.

http://www.luminous-landscape.com/tu...ding-mtf.shtml
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Old Apr 19, 2005, 6:27 AM   #13
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FYI (with illustrations) - http://www.photozone.de/3Technology/mtf.htm

Also here: http://www.bobatkins.com/photography.../mtf/mtf1.html
... and here: http://www.normankoren.com/Tutorials/MTF.html
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Old Apr 19, 2005, 3:40 PM   #14
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:O

Information Overkill :lol:

I feel like I leveled up to Novice.
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Old Apr 19, 2005, 7:07 PM   #15
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NHL,

Thanks. It took me a while to realize the charts have different scales horizontally :-) Your point about Bokeh is interesting. From one of the links:

http://www.luminous-landscape.com/tu...ding-mtf.shtml

One of the areas of image quality that MTF can help determine is bokeh. [..] This is where the meridonial and sagital lines come in. [..] The closer these lines are to each other the more pleasing the bokeh of the lens.

You can see that in the chart for the 24-70 looking at the wide open lines.

BTW, I love the constant F2.8 for the 24-70. Now if the 17-85 was constant F2.8 ..... I can keep dreaming :-)

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Old Apr 20, 2005, 2:40 AM   #16
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My 17-85IS isn't sharp at all and is really soft at the edges. I replaced it with a Tamron 28-75 and never looked back. I also picked up a Canon 70-200L IS and it just destroys the IQ either of those other could product
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Old Apr 20, 2005, 6:59 AM   #17
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IMHO the Sigma's are also excellent alternatives: :idea:
http://www.stevesforums.com/forums/v...292575#p292575
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Old Apr 23, 2005, 12:45 PM   #18
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One of the members over at eospix has just reviewed the 17-85.

Here is the link if you want to take a look.

http://www.eospix.com/reviews-19.html

I personally think the guy doing the review is a L Glass fanatic but hey, if you can afford it, live the dream.

He is right though, it is too expensive.





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