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28-70F2 with E-mount

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IamJF

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Through the ongoing discussion about mount sizes I estimated an E-mount flange to Canons 2870F2 zoom.

Looks easy possible for me.

Compare it with the small opening of the backshade of the lens. Also most Sony lenses have this shade way smaller as the mount diameter to get rid of stray light.



7c98f61b0a1b4d84b363dce5cd500205.jpg
 
To make the zoom lens smaller and lighter, I would take a:

35-70/f2 or 24-50/2, 25% smaller?, and oh, 35% cheaper!
IamJF said:
Through the ongoing discussion about mount sizes I estimated an E-mount flange to Canons 2870F2 zoom.

Looks easy possible for me.

Compare it with the small opening of the backshade of the lens. Also most Sony lenses have this shade way smaller as the mount diameter to get rid of stray light.

7c98f61b0a1b4d84b363dce5cd500205.jpg
Click to expand...
 
I would take a 35/1.4 and 85/1.8 with an A7riii. :-D With these lenses you can do things you can not with the zoom (ok, the zoom can do things you can not with the primes ;-)) and you are still lighter and cheaper.

I could also see a use for 24-50F2 for indoor stuff - therefore 28mm is already tight.

But I'm sure many people are happy with this zoom and it's a GREAT lens without question!
 
Just found that picture at lesnumeriques.com - clearly showes that a smaller mount would not be a problem.



1baed0b8e2284fa793dcb84d780d1f52.jpg
 
Personally I don't want such very large, heavy and expensive zoom, more gimmick than practically useful. My Tamron FE 28-75/2.8 is much lighter, smaller and cheaper.

F2.0 is not really that fast. If I really want fast I will use some truly fast prime lenses, 24/1.4 GM, 35/1.4, 50/1.4 or 55/1.8 and 85/1.4.

Currently I have Sigma 35/1.4 Art, Loxia 35/2.0, FE 55/1.8 ZA and may get CV FE 50/1.2 and Loxia 85/2.4 and will keep an eye on the newly announced Samyang FE 85/1.4 AF (that seems pretty light).
 
IamJF said:
I would take a 35/1.4 and 85/1.8 with an A7riii. :-D With these lenses you can do things you can not with the zoom (ok, the zoom can do things you can not with the primes ;-)) and you are still lighter and cheaper.

I could also see a use for 24-50F2 for indoor stuff - therefore 28mm is already tight.

But I'm sure many people are happy with this zoom and it's a GREAT lens without question!
Click to expand...
Yes, 24-50 mm f2 would be nice. Or even better 24-60 or 24-55. My old Panasonic LX3 compact camera had a 24-60 equivalent zoom, really worked well for me.
 
PWPhotography said:
Personally I don't want such very large, heavy and expensive zoom, more gimmick than practically useful. My Tamron FE 28-75/2.8 is much lighter, smaller and cheaper.

F2.0 is not really that fast. If I really want fast I will use some truly fast prime lenses, 24/1.4 GM, 35/1.4, 50/1.4 or 55/1.8 and 85/1.4.

Currently I have Sigma 35/1.4 Art, Loxia 35/2.0, FE 55/1.8 ZA and may get CV FE 50/1.2 and Loxia 85/2.4 and will keep an eye on the newly announced Samyang FE 85/1.4 AF (that seems pretty light).
Click to expand...
Not really a fan of the Canon 28-70 f2. I'm sure it is extremely sharp, but it has no IS (neither do any of the Canon bodies it mounts on either) has slow noisy AF, is the size of a beer keg, and it is hugely expensive. If Sony was to design a 28-70 F2 I'm sure they would at least equip it with decent AF, but it would bound to be very large, and very expensive.

I'm content to let Nikon and Canon partake in this odd contest of who can design the largest, heaviest, most expensive lenses with the widest f-stop.
 
I loved the multi aspect ratio switch on my LX3!

My dream is a modern camera with square sensor and horizontal and vertical multi aspect ratio ...
 
Just found a picture of the rear lens shade of the Canon lens - the big mount is not used at all, it should not be a problem to use the same design with the smaller E-mount:



1549547804_909_Canon-RF-28-70mm-f2-L-USM-Review.jpg
 
Tim O'Connor said:
PWPhotography said:
Personally I don't want such very large, heavy and expensive zoom, more gimmick than practically useful. My Tamron FE 28-75/2.8 is much lighter, smaller and cheaper.

F2.0 is not really that fast. If I really want fast I will use some truly fast prime lenses, 24/1.4 GM, 35/1.4, 50/1.4 or 55/1.8 and 85/1.4.

Currently I have Sigma 35/1.4 Art, Loxia 35/2.0, FE 55/1.8 ZA and may get CV FE 50/1.2 and Loxia 85/2.4 and will keep an eye on the newly announced Samyang FE 85/1.4 AF (that seems pretty light).
Click to expand...
Not really a fan of the Canon 28-70 f2. I'm sure it is extremely sharp, but it has no IS (neither do any of the Canon bodies it mounts on either) has slow noisy AF, is the size of a beer keg, and it is hugely expensive. If Sony was to design a 28-70 F2 I'm sure they would at least equip it with decent AF, but it would bound to be very large, and very expensive.
Click to expand...
Sony has already designed a 28-70mm F2.

Loading…

www.sonyalpharumors.com
 
IamJF said:
Just found a picture of the rear lens shade of the Canon lens - the big mount is not used at all, it should not be a problem to use the same design with the smaller E-mount:

1549547804_909_Canon-RF-28-70mm-f2-L-USM-Review.jpg
Click to expand...
You have already said this same thing 3 times. Are you trolling?

As you can see in the picture the shade is right up against the contact plate. The contacts have to go somewhere, so I do not understand how do you come to the conclusion that smaller mount is "no problem" for this design.
 
Was to quick with posting ... didn't realise I already had a pic here ... sorry. :-|

You see Canon contacts on the Canon lens ;-) - Sony has less of them, they will not go in the way of the light rays. Like here:



810_1223-back.jpg
 
By all means, it would be great to have more f2 zooms in any mount, or to have an RF to FE adapter :).

However, the contacts are there. Whether or not they will be in the light path can only be determined with a set of calipers and ray tracing software, or at list some drawing. I think. Would be interesting though. From a picture I can't tell. If you can, good for you ;).
 
I can not judge from the picture - but from the 85/1.8 lens in my table 😉

But after all we only can use the lenses which are built 😊 so it's just a theoretical exercise.
 
Regardless of whether it’s technically possible to make this lens, I have zero interest in such a lens. The weight of this lens is pretty heavy for long periods of hand-holding, and as another poster said, f2 isn’t all that fast relative to an F1.4 lens. The trade-offs seem a bit much just for the convenience of a zoom lens. Feel free to agree to disagree. :)
 
At First it looked like a Sony APS-C lense to me. But it is the new Canon mount, isn't it?

It seems Canon could use a bigger Sensor in Future.
 
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