The F2.8 choice, 12-40mm vs 12-35mm

Started Sep 9, 2013 | Discussions thread
drj3 Veteran Member • Posts: 6,784
Re: Two reasons why I'll probably buy the 12-35mm

bluelemmy wrote:

> whereas the 12-35 takes a 58mm filter.

As do the 35-100 f2.8 and the 14-140mm f3.5-5.6. A very professional move on the part of Panasonic.

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The longer focal length range of the Olympus design of the 12-40 obviously required a larger front element in order to allow enough light into the lens to maintain the 2.8 aperture and the same will probably be true of the new 40-150mm 2.8.  The Olympus FT 12-60mm 2.8-40 requires a 72mm filter and the 50-200mm 2.8-3.5 requires a 67mm filter.  I am certain that if Olympus wanted to offer a 12-35mm lens they could have used a 58mm filter.  It has nothing to do with being professional.  Panasonic chose a more limited zoom range design which allowed them to use a smaller front element for the lens.  I would personally prefer a longer focal length lens with a constant aperture and then buy another filter for those occasions where it was needed, than to give up the difference between 35 & 40mm in order to save a few dollars on filters.  I personally hope that Olympus never designs a lens based on maintaining a specific filter size, but rather designs lenses for best quality for the specific focal length and maximum aperture.

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