by Bart Arondson

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Canon created a high quality APS-C lens: the 17-55 EF-S f2.8. This lens is basically the L lens that Marketing ignored: it is built of similar quality as any L lens, and optically is equal to most. And, it has the price to go with it: nearly $1000 USD at introduction. The price is a bit lower now, but I suspect that this lens may have been an experiment ...


The main answer here is that Canon and Nikon don't offer anything high-end for APS-C. Their focus is on encouraging full-frame for those uses. This is almost certainly a marketing decision, not a technical one. Pentax, though, doesn't offer a full-frame SLR — instead, splitting between entry-to-high-midrange APS-C DSLR and a medium format offering above ...


Lenses designed for the Nikon 1 or M43rds systems are probably only ever going to be used with one size of sensor. When designing lenses for these systems there's no point casting a larger image circle than you need. Several DSLR (and SLT) systems offer both APS-C and full frame sensors with exactly the same mount. As already pointed out there's hardly any ...


Expanding on chuqui's answer slightly, Roger Cicalia of did a comparision of a high-end digiscope (Swarovski) against some high-end Canon lenses in 2012. Summarising the results briefly: In the centre of the frame, the sharpness of the digiscope compares well with the sharpness of the Canon lenses. Away from the centre of the frame, the ...


This is a combination of two factors: For any lens, the front element needs to be at least (focal length)/(aperture) in size - e.g. for a 400mm f/2.8, the front element needs to be 142mm in diameter. That number is independent of sensor size. For telephoto lenses, it's the big front element which makes up the majority of the weight and the cost (making a ...


Like most consumer-grade variable aperture zoom lenses, this lens is a series of compromises carefully designed to do many jobs reasonably well. While, for example, it will take a very good photograph at 100mm, it will not have the same image quality from the center all the way to the corners as, say, a Zeiss Makro-Planar 100mm lens. However, it also doesn't ...


Fairly simply, that lens is all three of: A macro lens, as it can produce magnifications which approach 1:1. A telephoto lens with a relatively long focal length and correspondingly small angle of view. A zoom lens with a variable focal length. These are three orthogonal concepts - as with this lens, it's perfectly possible for a lens to be all three of ...

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