Has sanity finally come to full-frame?

On 11/10/2016 4:12 PM, Me wrote:
On 11/11/2016 09:56, Neil wrote:
On 11/10/2016 3:48 PM, Neil wrote:
On 11/10/2016 1:02 PM, android wrote:
In article , Neil
wrote:

On 11/10/2016 12:11 PM, android wrote:
In article , Neil

wrote:

On 11/10/2016 12:17 AM, android wrote:
In article ,
RichA wrote:

Are they going to throw off the shackles of a format from 1909
and the
edicts
of video-creatures who like widescreen only? 4:3 might be coming
to FF.
Thank GOD.

https://www.dpreview.com/news/824393...nsor-with-glob



al
-sh
utter-and-8k-video-hits-market-from-cmosis

That format ain't going nowhere without new lenses...

Why do you think so? Since lenses are circular, they must cover the
same
area vertically as horizontally. Any lens that can cover the
width of
wider format sensors will work with this one. The sensor is within
the
coverage area of 35mm lenses, so there is an enormous number of
older
lenses in addition to the newer ones designed for digital cameras.

That format wont be covered by the 43mm circle of confusion
covered by
most FF or 35mm lenses:

https://en.wikipedia.org/wiki/Circle_of_confusion

What makes you think it would be any different from any other 35mm
image
area? The additional 0.43mm of width over the standard 36mm is
unlikely
to be much of an issue (except for very poorly designed lenses).
Beyond
that, the article said that the sensor is intended for MF, which makes
the image area totally acceptable for those using MF lenses and
willing
to put up with the crop factor (I'm not, which is why I never bought a
digital back for my Rollei 6008i).

From the linked article:

"Although the CMV50000 CMOS sensor is described as medium-format in the
press release, it is actually nearer to being 35mm-sized and measures
36.43 x 27.62mm (the width of a 35mm 'full-frame' sensor but elongated
out to 4:3 aspect ratio)."

The hight of a FF sensor is 24mm...

However, the _projected image_ of a lens is circular! Therefore, even
the worst 35mm lenses project a 36mm x 36mm image at the focal plane.

Thinking about the math, it's actually a little less than a 36 x 36mm
coverage, but still more than adequate for a 36 x 27mm sensor.

http://i.imgur.com/8iLKHiL.png
Blue is minimum image circle for 36x24 frame (in red)
Dotted lines show 4:3 format 36mm wide and square format 36mm.
Hope that helps visualize the issue.
Of course some lenses might work fine, but some may not.

Thanks, that does help. A circle with a 36mm chord is what I was trying
to describe. As you can see, only the worst 35mm lenses should be a
problem. No problem at all for MF lenses.

--
best regards,

Neil

On 11/10/2016 4:45 PM, android wrote:
In article ,
android wrote:

In article , Neil
wrote:

On 11/10/2016 1:02 PM, android wrote:
In article , Neil
wrote:

On 11/10/2016 12:11 PM, android wrote:
In article , Neil
wrote:

On 11/10/2016 12:17 AM, android wrote:
In article ,
RichA wrote:

Are they going to throw off the shackles of a format from 1909 and
the
edicts
of video-creatures who like widescreen only? 4:3 might be coming to
FF.
Thank GOD.

https://www.dpreview.com/news/824393...p-sensor-with-
gl
ob
al
-sh
utter-and-8k-video-hits-market-from-cmosis

That format ain't going nowhere without new lenses...

Why do you think so? Since lenses are circular, they must cover the
same
area vertically as horizontally. Any lens that can cover the width of
wider format sensors will work with this one. The sensor is within the
coverage area of 35mm lenses, so there is an enormous number of older
lenses in addition to the newer ones designed for digital cameras.

That format wont be covered by the 43mm circle of confusion covered by
most FF or 35mm lenses:

https://en.wikipedia.org/wiki/Circle_of_confusion

What makes you think it would be any different from any other 35mm image
area? The additional 0.43mm of width over the standard 36mm is unlikely
to be much of an issue (except for very poorly designed lenses). Beyond
that, the article said that the sensor is intended for MF, which makes
the image area totally acceptable for those using MF lenses and willing
to put up with the crop factor (I'm not, which is why I never bought a
digital back for my Rollei 6008i).

From the linked article:

"Although the CMV50000 CMOS sensor is described as medium-format in the
press release, it is actually nearer to being 35mm-sized and measures
36.43 x 27.62mm (the width of a 35mm 'full-frame' sensor but elongated
out to 4:3 aspect ratio)."

The hight of a FF sensor is 24mm...

However, the _projected image_ of a lens is circular! Therefore, even
the worst 35mm lenses project a 36mm x 36mm image at the focal plane.

No, they don't. Read the quoted article.

Please see my correction.

Edit: Read the LINKED article above and below:

https://en.wikipedia.org/wiki/Circle_of_confusion

I already read the articles you linked. Good info, but I don't think
it's relevant here. See the diagram that "Me" posted in response to my
comments. Many 35mm lenses could easily cover that sensor.

--
best regards,

Neil