I am pleased to see a lens like this is in the pipeline, but the RF-S mount really needs a constant aperture standard zoom lens. Preferably one that doesn’t start at a 29mm equivalent.
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Also, an unfavorable f stop at the long end. I prefer constant f-stop. Zoom in or out, the light is the same at that point and I would want the wide aperture available even at the long end.I never quite understood why anyone think it is so great to have constant aperture in these days of automatic cameras?
It only comes at the expense of a more favorable f-number at the wide end!
So i.e. a 9-18 mm f/4.0 constant aperture might as well have been 9-18 mm f/2.8-4.0.
I guess what AcaPixus is getting at is lenses like the Tamron 35-150 f/2-2.8 where f/2 all of the way would not be practical.No professional would "want to pay extra to get rid of it"
Or an identical f2.8 but for less money then the f2-2.8 ahahA counterargument is that a longer f/2.8 or shorter f/2 would be better.
Or an identical f2.8 but for less money then the f2-2.8 ahah
Well, let's just say, starting from 35-150 f2-2.8 then a 28-200 f2.8 or 24-180 f2.8 would be well received...CAAAAAAANON, did you read that?!
Thanks for posting the image.The maths behind it is the that the diameter of the Image circle must be at least as large as the sensor diagonal.
The Image height is the radius and therefore half the diameter.
For FF, the sensor dimensions are 26x24 mm. The diagonal is 43.27 mm. the Radius 21.633 mm, so better take 21.64 mm
Maybe this quick drawing can help.
View attachment 210188
Could be 1-2 years or never from filing. Keep in mind that we don’t find out a patent was filed until it publishes, which is 18 months after the filing date. Sometimes a lens comes out before or soon after a patent publishes.Does anyone recall or have an idea how long time there generally is between Canon files a patent for a lens until they announce it or start marketing it - if ever.
I am enthusiastic about that 9-18 mm to finally replace my venerable Sigma 12-24 mm Ex