Blackmagic Forum

I know everyone has been able to figure about what the crop factor is on the BMPCC, and there are plenty of threads on the topic. But I ask in an email to Black Magic what the exact crop factor is and they said 3.02x. Hope this helps anyone looking for the exact crop factor.

Edit* This crop factor is in relation to full frame/35mm cameras

The effective sensor size is 12.48mm x 7.02mm (super 16). Crop factor in reference to MFT is approximately 1.3x.

So in reference to:

FF: 3.02x

MFT: 1.3x

dcameraman wrote:So in reference to:

FF: 3.02x

MFT: 1.3x

Wait, what?

So, if I'm looking at a MFT lens, say a 12mm, does that mean that it's really a 12mm x 1.3 = 15.6mm, or a 12mm x 3.02 = 36.24mm?

So far I've only been considering crop relating to full frame.

Cop Factor is a Crop Factor is a Crop Factor is a Crop Factor. And "mm" in lens are "mm" in lens. So if you have 12mm lens it will be 12x3.0 on BMPC. It dosen't matter what type of mount you have, PL CANON MFT 4/3 NIKON and others. Correct me if i'm wrong.

Cropfactor is mainly referred to fullframe (35mm) ... so it will be lens-f*3.02 .... i.e. 12mm * 3,02 = 36,24mm ... so the picture will appear as a 36mm lens on a 35mm camera ....

Right. So where does MFT crop come in? Surely its just the 3.02 we need to worry about?

bigkevracer wrote:Right. So where does MFT crop come in? Surely its just the 3.02 we need to worry about?

The crop factor relates to the sensor size your using. Christine mentioned the 1.3 crop factor relative to the MTF sensor size. As in, if your used to using a MTF sensor, the crop relation to the smaller sensor on the BMPCC will be 1.3. If we´re talking about Full-frame sensor the crop ratio is 3.02.

Most of the time crop factor does not concern you until you need to calculate or evaluate
what your lens sees with your sensor.

If one puts MFT lens to BMPC then what it "looks like"

As João says... Crop factor needs to be based on your point of reference.

If you have been shooting with a Canon 5D or come from an SLR film camera than your point of reference is Full Frame 35mm. And so the crop factor for you would be 3.02.

If you have never shot on a Ful Frame 35mm and your only point of reference is a MFT then you need to consider a crop factor of 1.3.

Example 1 - You shoot with the 35mm on a Canon 5D. You love it and want a similar field of view on the BMPCC. You would go out and look for an 11 or 12mm lens. (35/3.02=11.59)

Example 2 - You shoot with the 15mm on a MFT camera. You love it and want a similar field of view on the BMPCC. You would go out and look for an 11 or 12mm. (15/1.3=11.54)

So the crop factor you chose to do your calculation is based on your point of reference.

And a Margus points out... if you have only ever shot on Super16 then crop factor means nothing to you.

Yes like it used to be with 16 movie.

I just talked to old dop and he said that you referenced your angle of visible area to that
film format and camera you are using.

This is why i pointed that lens size combined with sensor and crop factor.

So you take mft lens and calculate with it's "native" crop to sensor and presto.

Forget 35mm in that sense and re educate this part just.

36mm:12,46mm is crop factor 2,889x (reference full framme 24x36mm)

BTW, "Full Frame 35mm" is a still photography format, not a standard motion picture format. In movies, "FF" is called "65mm" or "Vista Vision" and was used most recently as a high-resultion method for capturing special effects plates.

"Crop factor" is a term invented to inform still photographers of the relative size of a digital stills sensor to 35mm still film.

If you want your videos to look like a Hollywood movie, compare the sensor to S35 or Academy Aperture, not to FF/65mm/Vista Vision.

+1 to the DOP -- compare by calculating AOV

popcornflix wrote:BTW, "Full Frame 35mm" is a still photography format, not a standard motion picture format. In movies, "FF" is called "65mm" or "Vista Vision" and was used most recently as a high-resultion method for capturing special effects plates.

"Crop factor" is a term invented to inform still photographers of the relative size of a digital stills sensor to 35mm still film.

If you want your videos to look like a Hollywood movie, compare the sensor to S35 or Academy Aperture, not to FF/65mm/Vista Vision.

+1 to the DOP -- compare by calculating AOV

I know, that's why I specified. so there is no confusion. if you look at technical specifications of any camera. the comparison is made on 24mmx36mm lenses and speaks only of viewing angle. to give us a reference. tell you so, and also in degrees
Ya lo sé, por eso lo he especificado. para que no haya confusion. si miras especificaciones tecnicas de cualquier camara. la comparacion de lentes se hace sobre 24mmx36mm y se habla solo de angulo de vision. para que nos hagamos una referencia. te lo dicen así, y tambien en grados