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The depth of field of a 40mm is the same whatever the size of the sensor. With a standard Alexa you would need to shoot on a 32mm (some say wider) to match the field of view of a 40mm on a Large Format camera. A small adjustment to the iris will not change the ‘feel’ of that lens. The additional latitude and resolution of the LF can be an advantage over the standard Alexa but that would not be my main consideration when choosing one camera over the other. The ‘feel’ of the lens is uppermost in my mind.
I understand that part. So you’re saying the Signature Prime lenses have a better “feel” than Master Primes? If so, why wouldn’t you use a 32mm Master Prime wide open on a S35 camera instead of a 40mm Signature Prime on the LF at a T2?
Is it simply down to the resolution advantages of the LF camera?
Not s35 vs LF but you get the idea on how different formats/sensors and lenses compare. https://youtu.be/RwgkXcUX984
The only difference I see is the increased resolution and shallower depth of field on the Alexa 65. They look very similar to me.
I didn’t know the Alexa LF had more latitude. Lower noise, yes, but one needs to stop down to match the depth of field of a S35 camera. Going back to my original question, do these two variables not cancel each-other out?
What’s considered a wide lens is not the same when compared full frame to S35 sensor, so I’m not sure what you mean by less aberration on wider focal lengths.
Do you have any specific examples where lens design is better on the equivalent full frame lens? For example, does a 18mm Signature Prime have less aberration than a 14mm Master Prime?
Regarding the noise advantage of a full frame sensor: If you have to stop down the iris to compensate for the depth of field, is there still a noise advantage to using the larger sensor?
Hey Roger,
On ‘1917’ you used the Arri Signature Primes which open up to a T1.8. Would the depth of field have been significantly different if you shot on a S35 Alexa and Master Primes at a T1.4?
I’m not questioning your choices, I’m just trying to understand the benefits of shooting full frame digital.
I understand the increased information.
When I said S35 Alexa, I was referring to the older Alexas such as the Alexa XT Studio, Mini etc. and not the Alexa 35 which has a new sensor.
You’re right, I meant closing down the iris to compensate for the depth of field between the LF and the S35.
