Sigma coming for Canon with an 180-800mm f/5.6-8?

[Canon Rumors]

Sigma has been hitting it out of the park for quite some time, and looks like they're going to continue that trend. This is all great for some, but not for us yet.

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[DhlcadR6]

It might be same size as RF200-800, but likely to be heavier.

 

[blackcoffee17]

No chance that a Sigma 180-800 to be ever available on RF.

 

[neonlight]

Something does not compute? Image height only 21.63mm? Not FF, too big for APS-C. Perhaps an APS-C lens? Can't see that 180-800 just for APS-C.

 

[Loswr]

Something does not compute? Image height only 21.63mm? Not FF, too big for APS-C. Perhaps an APS-C lens? Can't see that 180-800 just for APS-C.

Sorry, what does not compute is your understanding of patents. "Image Height" is not the vertical dimension of the image sensor, but rather it is one-half of the diameter of the image circle. The minimum diameter* of the image circle for a given format is the diagonal measure of the sensor. Plug 24mm and 36mm into the Pythagorean Theorem and you get 43.26mm, divide that by two, and you get...21.63mm. So yes, that's a full frame design.

*Note that for lenses requiring/forcing digital correction of geometric distortion, the image height can be slightly smaller than half of the sensor diagonal, because distortion correction will 'stretch' the final image to cover the corners of the sensor.

 

[neonlight]

Sorry, what does not compute is your understanding of patents. "Image Height" is not the vertical dimension of the image sensor, but rather it is one-half of the diameter of the image circle. The minimum diameter* of the image circle for a given format is the diagonal measure of the sensor. Plug 24mm and 36mm into the Pythagorean Theorem and you get 43.26mm, divide that by two, and you get...21.63mm. So yes, that's a full frame design.

*Note that for lenses requiring/forcing digital correction of geometric distortion, the image height can be slightly smaller than half of the sensor diagonal, because distortion correction will 'stretch' the final image to cover the corners of the sensor.

Thanks for clarification. Though if I'd read the patent I would have seen that.