New EF 70-300 f/4-5.6 IS?
I've received an email saying Canon will be replacing the 70-300 f/4-5.6 IS with a new version.
The current version was launched in 2005 and has been a good seller for Canon.
I have heard stories from various retailers about the lens being backordered for a while now.
I'm going to say the likelihood of this being replaced is low, unless I hear from better sources.
100-400?
These are still easy to get from Canon, I do not see a replacement.
cr
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40 Comments
28mm times 1.6 = 44mm. and a 30mm = 48mm. Either would be good on an APS-C camera.
I’ve used a 400mm DO and was impressed with the IQ.
Tool
DO saves a lot of expensive low dispersion glass and makes the lens much more compact.
The end product does not have to be much more expensive than a non-DO equivalent.
f/4 will make it very expensive, that is for sure.
Why isn’t there such a benefit ?
All things being equal (e.g. focal length & aperture), shouldn’t the size of the lens’ front element be linearily proprotional to the sensor’s diagonal ?
I do not claim to be an expert in lens design, but from what I have read, there is a competing relationship between the focal length and the aperture in determining the size of the front lens element. At short focal lengths (less than ~50mm), the focal length determines the front element size. At longer focal lengths, the aperture determines the element size. Therefore, an EF-S 70-200 f/2.8, for example, would be about the same size as an EF 70-200 f/2.8 since they are both f/2.8 aperture at focal lengths greater than 50mm. The EF-S 17-55 f/2.8, however, is smaller than an EF 17-55 f/2.8 because the focal length is the primary determinant of front element size at those short focal lengths.