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andrewgray

Eos R crop in 4K

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Andrew had a nice rant about this.

https://www.eoshd.com/2018/09/dishonest-misleading-unnecessary-eos-r-and-cropped-4k/

In short, it´s a smaller effective sensor size than APS-c/Super 35, almost getting at micro four thirds levels...

(With crop-glass like Sigma 18-35 and 30mm F1.4 you can compensate somewhat).

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1 hour ago, andrewgray said:

If the sensor is 36mm wide and there's a 1.75 crop on 4K doesn't that make it a 21mm wide chip which is only about 12 percent smaller than a super 35mm chip. Am I missing something? 

You're correct. The cropped area is between APS-C and M4/3.

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2 hours ago, andrewgray said:

If the sensor is 36mm wide and there's a 1.75 crop on 4K doesn't that make it a 21mm wide chip which is only about 12 percent smaller than a super 35mm chip. Am I missing something? 

Yeah but a m4/3 Sensor in say the PK4 is 18 mm × 13.5 mm. So it is not like the crop is too far away from it either. s35 is 23.5 × 15.7 mm. It is closer to m4/3 for what most people will shoot 4K in. It really is 1.8 for UHD, 1.74 for DCI so it is more like 20mm at times. Either way it pretty much sucks. But it is what it is. If you have a bag of Canon lenses, hopefully some EF-S ones, well you are going to buy it like it or not.

So if you sort of want to match your Canon APSC footage best to shoot in DCI.

Found this chart. First I ever saw listing a PK4. Arri 65mm is...well it is Huge!

http://www.studiodaily.com/2018/07/download-phil-hollands-digital-film-sensor-chart/

 

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1 hour ago, FreshGiant said:

Is a focal reducer technically possible? There would be a lot of demand for one if you could get the crop back closer to FF and still have working EF electronics/auto focus.

Its not only possible its already been done on Sony and Fuji. And I have confirmation several different focal reducers are in the making for the EOS-R as well as the Z6/7 :)

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17 minutes ago, Mattias Burling said:

Its not only possible its already been done on Sony and Fuji. And I have confirmation several different focal reducers are in the making for the EOS-R as well as the Z6/7 :)

Z6 has no crop in 4K, so I assume such focal reducers are meant to use with medium format lenses? If focal reducers only work in crop mode for video and have to be removed for stills I doubt they are commercially viable.

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2 minutes ago, androidlad said:

Z6 has no crop in 4K, so I assume such focal reducers are meant to use with medium format lenses? If focal reducers only work in crop mode for video and have to be removed for stills I doubt they are commercially viable.

Well. there are plenty of speed boosters for as small sensors as the m4/3, BMPCC s16 all the way down to Pentax Q. So Im sure they will sell just fine.

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13 minutes ago, Mattias Burling said:

Well. there are plenty of speed boosters for as small sensors as the m4/3, BMPCC s16 all the way down to Pentax Q. So Im sure they will sell just fine.

But those cover the whole sensor.

For speedboosters to cover FF sensor, medium format lenses is the only way to go.Insert other media

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I know Kipon does sell a medium format to Sony E mount focal reducer. So maybe they could make one for Nikon as well. There is a EF to Eos R  adapter but Canon doesn't put any glass in there because obviously because it would cause photos to vignette. But if some other company can get that out and get the crop close to full frame AND keep the auto focus working, then I think the EOS R becomes much more interesting for video work.

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24 minutes ago, androidlad said:

But those cover the whole sensor.

For speedboosters to cover FF sensor, medium format lenses is the only way to go.Insert other media

Well, some FF cameras have a better crop mode than FF mode in video, so one could shoot in crop mode and then gain back the FF FOV and an extra stop by using a speedbooster. 

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5 minutes ago, mercer said:

Well, some FF cameras have a better crop mode than FF mode in video, so one could shoot in crop mode and then gain back the FF FOV and an extra stop by using a speedbooster. 

Yes that's true. From a business standpoint, developing a speedbooster that only works in video doesn't seem viable.

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1 hour ago, mercer said:

Well, some FF cameras have a better crop mode than FF mode in video, so one could shoot in crop mode and then gain back the FF FOV and an extra stop by using a speedbooster. 

Yeah and by doing that you help with Rolling Shutter when you are back into FF also.

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54 minutes ago, androidlad said:

Because Sony use E mount for both FF and APS-C stills/cinema cameras.

A7RII/III have great quality S35 crop mode for video (and stills), but I rarely see people use speedbooster on them.

It was a trick on the original A7s also, They are Terrible for rolling shutter.

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20 hours ago, androidlad said:

Because Sony use E mount for both FF and APS-C stills/cinema cameras.

A7RII/III have great quality S35 crop mode for video (and stills), but I rarely see people use speedbooster on them.

I confirm I have a7RII various lenses, practically almost all adapters, but no speed booster ...
Maybe, but I'm thinking about a M42 ... 👋

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On 11/12/2018 at 11:15 PM, androidlad said:

Because Sony use E mount for both FF and APS-C stills/cinema cameras.

A7RII/III have great quality S35 crop mode for video (and stills), but I rarely see people use speedbooster on them.

To clarify once again, the Metabones Speedbooster for Sony E-Mount was popular, used by many and recommended by several reviewers to be used on the Full frame A7x.
We are talking about niche stuff here. Most that uses an adapter and definitely speed boosters are a minority of camera nerds. You can't apply what the general public like to stuff like speed boosters. Because they don't buy it anyway. Metabones entire business idea is to cater to camera nerds like us that are willing to jump through all kinds of hoops. 

3 hours ago, maxmizer said:

I confirm I have a7RII various lenses, practically almost all adapters, but no speed booster ...
Maybe, but I'm thinking about a M42 ... 👋

I can confirm the opposite :)

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