Monster Super35 Lens from Canon!

morgan_moore said:
What I find interesting about this lens is it is a signifier of "the death of 2/3"

Shooting at 8 or so surely gives a similar look to shooting a faster zoom on 2/3 - so why change to S35 then shoot 'stopped down'?
Click to expand...
It's because going to s35 gives the OPTION of EITHER using a prime or short range zoom, which can be quite fast and give shallow depth of field, *OR* using a long range zoom lens. Otherwise, you're quite right - if you only ever used a lens like this you may as well stick to 2/3" and a faster lens.

If you wanted a lens like this - but f2 - it would be massive, heavy, and impractical for much use. It's worth realising that optically the front element diameter is the ONLY real defining factor in terms of depth of field and low light abilities for a given sensor resolution and technology - make the sensor bigger and you get a higher ISO/smaller f stop, make it smaller and get a lower ISO/bigger f stop. The only way to take advantage of the higher ISO figures associated with larger sensors to get better low light performance is to make the front element bigger. Otherwise you'll always be robbing the ISO Peter to pay the aperture Paul!
morgan_moore said:
It has to be a realisation that 4k or suchlike is hard to jam into 2/3 and that 'broadcast' (read live sport) will be coming from S35 soon.

No one is going to make that investment unless they are 'in' S35 for the next decade.
Click to expand...
There are a couple of factors. One is the photosite size, but the other is engineering to align the R,G,B sensors in precise alignment through the ice block. Each corresponding R,G,B photosite has to be in exactly the same optical position or you'll get registration errors. (Which those old enough to remember tube cameras may remember with nostalgia.... :) ) The higher the resolution, the tighter the tolerance needs to be.
 
I get that this lens isn't going to be F2 and that front element size basically defines the look/dof - therefore the only purpose of this lens* is if you are swapping your stock of cameras from 2/3 to S35

*im assuming that it pretty much matches the 2/3 lenses used at sports arenas.

S
 
steve phillipps said:
I don't think so, because each of the 3 chips only sees one colour so each would need 3840x2160 pixels. The S35 has the same amount of pixels, it just goes through a debayer. I think that's right!?

Steve
Click to expand...
An s35 frame has approximately 7.5x (let's call it 8x) the area of the 2/3" frame. So for a s35 sensor of 3840x2160, each photosite will be about 8x the area of the equivalent one for a 2/3" sensor.

But - as already pointed out - a 3840x2160 Bayer won't give true 4k resolution. You really need to double the count (as the F65 does), hence in that case the photosites are still 4x bigger than each would be for 2/3"
 
morgan_moore said:
I get that this lens isn't going to be F2 and that front element size basically defines the look/dof - therefore the only purpose of this lens* is if you are swapping your stock of cameras from 2/3 to S35

*im assuming that it pretty much matches the 2/3 lenses used at sports arenas.
Click to expand...
Probably truer to say if you're getting new lenses anyway. If you've already got glass for 2/3" which suits you in terms of reach etc on 2/3" cameras, replacing them with something like this is probably not as cost effective as using high quality adaptors.

It may well be the case that the forward sections of this lens are the same or fundamentally similar to a 2/3" lens anyway, but with the rear section replaced to suit the s35 format, together with the mount. Which is really all an adaptor does - modifies the back section, the rear focussing lens, the cover the different sized sensor. It's worth looking at http://en.wikipedia.org/wiki/Zoom_lens to get a good idea of basic principles if you're not familiar already. Whilst "real" zooms will be far more complicated with far more elements, the basic principle of the three sections holds good.

The front section defines light gathering properties, middle the "zooming" part, the rear actually forms the image on the sensor. Convertors work by modifying the properties of the rear section.
 
You must log in or register to reply here.
Back
Top