http://www.lensrentals.com/blog/2014/06/comparing-rangefinder-and-slr-50mm-lenses-version-0-7#more-18865
Lensrentals.com的Roger Cicala所發表的新文章
他用新設置好的Optical bench來做不同一般的鏡頭測試
Actual Focal Lengths
The Imagemaster contains a grid that lets us measure the exact focal length without a lot of calculations. It isn’t particularly important to note that the Sigma 50mm f/1.4 Art lens has an actual focal length of 49.5mm, while the Zeiss 50mm f/1.4 is 51.5mm and the Canon 50mm f/1.2 is 51.8mm. But I found it amusing when I saw the Zeiss 55mm Otus is actually 54mm, because I’d just read a comment that someone found the Canon 50mm focal length much more usable than the 55mm of the Otus. Really, 52mm is much more usable than 54mm?
It does become slightly interesting with zooms. For example, the 24-70 f/2.8 zooms are between 66 and 67.5mm at the long end, while all 70-200 f/2.8s we’ve tested start at 74 to 76mm.
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上次稍有爭議的視角問題。
看他們應該也測試過很多50mm的鏡頭，怎麼canon大廠還沒列上?
Otus 55mm F1.4在這裡好像感覺就變普通了
Weilli wrote:
請問這間網站的本行是...(恕刪)
"Lens Rental"啊
我沒有一直追蹤這個blog，不過就我看過的一些內容
Roger(更正，從回應裡看起來他應該不是老闆)一開始是有興趣加上要維護出租的器材
後續就慢慢添購了各式光學測試儀器
這個測試跟一般的Imatest有很多不同點，跟實拍間還是有一段差距
Otus的實力我想沒什麼好懷疑的吧
我的相簿 http://www.flickr.com/photos/calatravayang
http://www.imx.nl/photo/leica/apo-summicron-m-250-mm-asph.html
數據是怎麼來的他沒細講，但結果顯然跟Roger的不同
我的相簿 http://www.flickr.com/photos/calatravayang
Horology wrote:
研究Leica的專家...(恕刪)
也許這就是原因？
http://www.lensrentals.com/blog/2014/06/the-glass-in-the-path-sensor-stacks-and-adapted-lenses
我的相簿 http://www.flickr.com/photos/calatravayang
沒想到M43是用這類型的low pass filter。
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