Canon files a patent for a wide-angle RF-S zoom

[LSXPhotog]

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.

 

[sanj]

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.

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.

 

[sanj]

It is, generally at the tele end one needs the wide aperture to hand hold with a slower shutter speed. At wide: Perhaps a landscape is being shot and f11 would be set anyways. At wide it is easier to handhold with a slower shutter speed.

 

[EOS 4 Life]

No professional would "want to pay extra to get rid of it"

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.
A counterargument is that a longer f/2.8 or shorter f/2 would be better.

​

 

[Deepboy]

A 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?!

 

[Deepboy]

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?!

Other then that...being serious, if Canon could manufacture the 28-70 f2 then I'm pretty sure they would be able to manufacture a 28-105/120 f2.8 for basically the same money/size/weight of the 28-70. Probably would be without IS, but I would surely chose a non-IS 28-105/120 then the 24-70 IS.

You could have 24-70 f2.8 IS, 24-105 f4 IS and a 28-120 f2.8 to choose, I don't think they really overlap, first is for shooting still subjects in low light (IS isn't useful if you subject moves), second is a walk around/do-it-all lens cheap and light (compared to the others) and the third is a perfect wedding lens, where IS isn't so useful but a longer range from wide to tele (like the 35-150) may enable you to work with a single lens on a single body for the whole event.

 

[Tom W]

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

Thanks for posting the image.
Looks like another ultra-wide where Canon will be software-stretching the corners to make it fit full frame. Not as good as the real thing, especially if you wish to photograph stars, but it does make the lens simpler and presumably less expensive.
And Canon isn't the only one doing this.

 

[ghalib737]

Are those real??

 

[AcaPixus]

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

 

[neuroanatomist]

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

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.

The most important thing to note is that only a very small percentage of patents actually become products.