"Fri Dec 14, 2012 11:44 am
rick.lang wrote:
jevon99 wrote:
4:3 feature request is so you can use anamorphic lenses without cropping..
Anamorphic lenses squeeze the image by a factor of two, thus projecting a 1.195:1 aspect ratio image onto the sensor. When using sensors that are natively 16:9 or even wider, it is necessary to crop the sides, resulting in a much smaller used sensor area and a different angle of view for the lens.
That's not my understanding or how I'd explain it. The anamorphic lens or adapter has a front element or group that acts like a wide angle lens in the horizontal plane, but a normal lens in the vertical plane. So it squeezes the image horizontally giving for example twice the horizontal field of view but a normal vertical field of view. You can use a projector with an anamorphic lens that reverses the effect so on the cinema screen you see a much wider field of view than normally. Or you can expand the squeeze digitally in Resolve or your NLE so your rendered video has the wider field.
If you put a 2x anamorphic on a 4:3 sensor, you end up with a 2.66:1 aspect ratio. If you want to render out to a 2.39:1 widescreen format, yes, you would crop the sides. If you have a 16:9 sensor and a 1.35x anamorphic, then it will expand to a 2.4:1 aspect ratio. Older anamorphics are almost always 2x, hence the great desire to use 4:3 aspect ratio on the sensor. SLR Magic plans to make a 1.35x (or 1.33x) anamorphic designed to be used on 16:9 HD sensors like the BMCC.
Rick Lang
Sent from my iPad using Tapatalk HD
I quite literally copied and pasted my paragraph explaining it from the Arri Alexa brochure. I'll let you tell them they're wrong then lol
Glen Jevon
http://www.facebook.
Thanks for explaining your comment was in regards to the Arri Alexa. I think I found the same brochure in this article below. I agree with your original comment as it applied to Arri. But not everyone does that squeezed 1.195:1 image on the sensor, including Arri.
Read a little further and you'll see that the new Arri isn't using that aspect ratio (which made perfect sense if they were only trying to support eventual viewing as 2.39:1 widescreen). The new Arri Alexa Plus 4:3 makes complete use of the optional 4:3 sensor area and then of course could be used to support up to 2.66:1 aspect ratio presumably.
http://www.arrimedia.com/news/view/27/a ... anamorphic
Cheers.
rick.lang wrote:
jevon99 wrote:
4:3 feature request is so you can use anamorphic lenses without cropping..
Anamorphic lenses squeeze the image by a factor of two, thus projecting a 1.195:1 aspect ratio image onto the sensor. When using sensors that are natively 16:9 or even wider, it is necessary to crop the sides, resulting in a much smaller used sensor area and a different angle of view for the lens.
That's not my understanding or how I'd explain it. The anamorphic lens or adapter has a front element or group that acts like a wide angle lens in the horizontal plane, but a normal lens in the vertical plane. So it squeezes the image horizontally giving for example twice the horizontal field of view but a normal vertical field of view. You can use a projector with an anamorphic lens that reverses the effect so on the cinema screen you see a much wider field of view than normally. Or you can expand the squeeze digitally in Resolve or your NLE so your rendered video has the wider field.
If you put a 2x anamorphic on a 4:3 sensor, you end up with a 2.66:1 aspect ratio. If you want to render out to a 2.39:1 widescreen format, yes, you would crop the sides. If you have a 16:9 sensor and a 1.35x anamorphic, then it will expand to a 2.4:1 aspect ratio. Older anamorphics are almost always 2x, hence the great desire to use 4:3 aspect ratio on the sensor. SLR Magic plans to make a 1.35x (or 1.33x) anamorphic designed to be used on 16:9 HD sensors like the BMCC.
Rick Lang
Sent from my iPad using Tapatalk HD
I quite literally copied and pasted my paragraph explaining it from the Arri Alexa brochure. I'll let you tell them they're wrong then lol
Glen Jevon
http://www.facebook.
Thanks for explaining your comment was in regards to the Arri Alexa. I think I found the same brochure in this article below. I agree with your original comment as it applied to Arri. But not everyone does that squeezed 1.195:1 image on the sensor, including Arri.
Read a little further and you'll see that the new Arri isn't using that aspect ratio (which made perfect sense if they were only trying to support eventual viewing as 2.39:1 widescreen). The new Arri Alexa Plus 4:3 makes complete use of the optional 4:3 sensor area and then of course could be used to support up to 2.66:1 aspect ratio presumably.
http://www.arrimedia.com/news/view/27/a ... anamorphic
Cheers.
Rick Lang