Originally Posted by Sheiky
I dunno. I do know that Apple does the same thing -- their 16GB iPhones really have a capacity of 13.7 GB, their 32GB iPhones a capacity of 28GB, etc.
Originally Posted by Sheiky
I dunno. I do know that Apple does the same thing -- their 16GB iPhones really have a capacity of 13.7 GB, their 32GB iPhones a capacity of 28GB, etc.
Well every hard-disk or other storage system has that, even on windows pc's. I believe it has something to do with computers seeing 1GB as 1024MB (bits-system) and the product makers state it as 1000MB(decimal system). So if you'd buy a 750GB HDD, devide it by 1.024 and you'll end up with what your PC makes of it...(or something like that [:P])
But focal length is not touched by any mathematic system or something. It's pure physics right? 200mm focal length "IS" 200 focal length. Got to dig that stuff back up before I can explain it [:P]
Interesting comparison. I did some shooting this weekend, and the EXIFs
for 200mm shots came up as 200mm. Go figure.
Having such a broad range of lenses to choose from is at the same time a blessing and a curse!
Originally Posted by lynx
I would say you're getting scammed! [A]
Originally Posted by lynx
If you're aware of the abilities of a broad range it's definitely an advantage! It's only a curse if something different happens that you didn't expect to happen []
Originally Posted by Sheiky
EXIF with both says 200mm.
Originally Posted by Sheiky
True - I almost added that statement to my post. Bryan's review of the 18-135mm doesn't mention anything odd about the long end, and the focal length comparisons shot that 135mm is a lot tighter than 87mm.
Originally Posted by Sheiky
I doubt it. For a camera lens, focal length is the distance from the nodal point of the lens to the sensor/film. For the EF-S 18-200mm @ 200mm, that distance will be 200mm as calculated by Canon's engineers (depending on lens elements, the nodal point can be well forward of the front element the lens). The relationship of focal length to angle of view makes several assumptions (e.g. perfectly rectilinear and no distortions). Presumably because of distortions in the lens, the angle of view for the 18-200mm @ 200mm is wider than for other lenses at that same focal length.
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<div>Is it considered a curse if I have a sore back after carrying them all around for a day? [:P]</div>Originally Posted by Sheiky
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