Patent Application: The Zoom You’ve Dreamt About: 70-150mm F2.0
- Thread starter Richard CR
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I\'m only posting a comment because the website won\'t let me view the other pages in the thread unless I get there this way. Something to look into, CR team and Craig.
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I'll have what she's havingCanon please, make an ultra-sharp 24-70 f/2 just for me...
(Maximum weight 1 kg.).
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Thanks!
I swore I saw that when i first looked at the patent app, and even told Craig there was a 70-150mm F1.8 then when i was writing it up, the machine translate buried that one.
this is what it looks like - most of the times I catch these.
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I just looked through the patent. The f1.8 is numerical example 6 (of 8).
It took a long while to fully complete the translation on the Japanese Patent Site.
Edit: Add details.
[0092]
[Numerical Example 6]....
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There is no technical reason why this lens would cost more to design and produce than either of Canon's current 70-200mm f2.8 LIS lenses.Don't we wish.I'll jump out on a limb and say $6k. Final answer.
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I suppose it's the quantities involved - smaller production run will require higher price to cover those costs to make a profit. How many would buy it compared with a 70-200/2.8?
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Wouldn't virtually all elements and the body itself be significantly larger? More time to grind glass (if they still do that)? Serious question. I profess zero knowledge in lens manufacturing. I'm just see 2.8 vs 4.0 lenses and assume the same jump to get to 2.0 from 2.8.
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If the lens was 70-200, then yes. But the rumor is 70-150. 200/2.8 = 71.4mm, 150/2 = 75mm, not too different. For an analogy, look at the 24-105/2.8 vs. the 28-70/2 – the former is longer and the other is fatter but they're only 100g different in weight.
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@Canon Rumors Guy
another f/2 zoom to “compliment” the RF 28-70mm
https://www.canonrumors.com/is-something-like-the-rf-70-150mm-f-2l-usm-actually-coming/
Complement = to complete
Compliment = to say nice things
another f/2 zoom to “compliment” the RF 28-70mm
https://www.canonrumors.com/is-something-like-the-rf-70-150mm-f-2l-usm-actually-coming/
Complement = to complete
Compliment = to say nice things
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No they wont. The math tells us that the lens will be of similar size and bulk, maybe even slightly smaller than the current 70-200/2.8. it's reasonable to assume that it will be shorter in physical length.
The aperture value / rating of a lens is a ratio between the diameter of the front element and the focal length of the lens. So fo example a 300mm f2.8 will have a from element diameter of approximatly 100mm. Put the 200mm f2.8 into the same math grinder an your get approximatly 72mm. Put a 140mm f2 into the same equation and we see 70mm. Canon often upsize their front element and then use the pupil size to obtain similar light transmission / simlated aperture values. For instance, there is no aperture related reason why a 28-70mm f2.0 lens needs a 95mm diameter front element. It might be good for other optical reasons, but it's not related to the lens' aperture value.
If you look back at the original EF 80-200mm f2.8 (aka the magic Drain Pipe), you will see that it's front element is only 72mm and yet it is a 200mm f2.8 optic.
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I think start with Gym first...Hmmm... an RF 28-70mm f/2L and RF 70-150mm f/2L combo. I just don't know.
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Not quite. The f/number (‘aperture value’) is the ratio between the focal length and the diameter of the entrance pupil (the optical representation of the physical iris diaphragm).
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Ahh, ok...has canon ever relased their diaphragm size data on their lens specs?
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