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<blockquote data-quote="okulo" data-source="post: 499837" data-attributes="member: 40687">I don't know how useful this might be but I took a series of deliberately out of focus photos of a fairly neutral surface at every f stop on the 18-300mm f3.5-6.3 in quick succession (so there was no change in the light) and reduced them all to fit in a table for comparison.It seems to me that there is a bit of a curve which peaks at around f6.3 and then descends again but f22 looks darker than f3.5 if compared directly.The images in the table are all a quarter actual size so if anybody wants to inspect them, they can be opened at 600x400 in a new tab and flicked back and forth for closer comparison.If you open f3.5 and f6.3 or f22 and f6.3 in separate tabs and flick between them, the contract is fairly stark and I would not consider that within a reasonable tolerance but my test may be flawed somehow.<a href="http://media.okulomedia.com/nikon/d5500/test01/" target="_blank">Nikon D5500 Exposure Test</a></blockquote>

[QUOTE="okulo, post: 499837, member: 40687"] I don't know how useful this might be but I took a series of deliberately out of focus photos of a fairly neutral surface at every f stop on the 18-300mm f3.5-6.3 in quick succession (so there was no change in the light) and reduced them all to fit in a table for comparison. It seems to me that there is a bit of a curve which peaks at around f6.3 and then descends again but f22 looks darker than f3.5 if compared directly. The images in the table are all a quarter actual size so if anybody wants to inspect them, they can be opened at 600x400 in a new tab and flicked back and forth for closer comparison. If you open f3.5 and f6.3 or f22 and f6.3 in separate tabs and flick between them, the contract is fairly stark and I would not consider that within a reasonable tolerance but my test may be flawed somehow. [url=http://media.okulomedia.com/nikon/d5500/test01/]Nikon D5500 Exposure Test[/url] [/QUOTE]

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