Ultrawides : full frame v crop sensor options ?

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fishy wishy
fishy wishy Veteran Member • Posts: 8,385
Ultrawides : full frame v crop sensor options ?

Is anybody else in both FF and crop bodies and has ever wondered which system to get an ultrawide for or ever compared them? I think it worth asking especially as equivalent ultrawides on crop sensors tend to be half the price of FF equivalents. From a personal perspective, I liked some old APS-C cameras with the CCD era colors.

Is it correct to assume that FF comes with an extra stop and a bit of dynamic range making it the natural choice for quality?

And does anybody know something about issues in ultrawide lens design for FF and crop sensors? Do either FF or crop sensor lenses have more of an uphill technical battle to fight? Is it easier to design a crop sensor ultrawide good through to the corners for instance?

For example: there's a well-reviewed lens the Sigma 8-16 f4.5-5.6 for crop sensors . On FF that would be equivalent to 12-24 f7-9 which is very slow but in acceptable range for landscape, as long as it is good wide open of course. An equivalent in FF could be the Sigma 12-24 f4.5-5.6 which came in 2 versions, only the last enjoying a decent reputation "for those buying a 12-24mm, for full frame on any system, the new Sigma [non-Art] represents even better performance than the 8-16mm (better edge and corner sharpness at one stop down from wide open) and has none of the failings of the older lens even if it does need more post-process geometry correction." - photoclubalpha

I have to say there is little consistency on reports re whether the 12-24 or 8-16 is better though.

There's also a very interesting page on the 8-16 v Nikon 14-24 on different systems in the quest of optimum IQ for landscape. Although the 14-24 has a good reputation it's showing its age perhaps. "Lens speed aside, the Sigma 8-16mm f/4.5-5.6 HSM holds its own perfectly against the legendary Nikon 14-24mm f/2.8 AF-S. In fact, the Sigma’s overall performance over the frame & the zoom range is higher than the Nikon’s, except perhaps at 18mm in some parts of the image – a pretty impressive feat, considering that the Nikon 14-24mm f/2.8 AF-S [was] considered by many the best UWA zoom ever made."

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