Focusing on Depth of Field and Lens Equivalents

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Filmmaker IQ

Filmmaker IQ

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Please consider supporting us on Patreon: 🤍🤍patreon.com/FilmmakerIQ How much space in front of the lens will be in focus? That question defines Depth of Field – but this simple concept has lead to a staggering amount of confusion in today’s multi-format camera environment. Through some fundamental scientific demonstrations, we will clarify concepts like circle of confusion and lens equivalency. Take the full Filmmaker IQ course on Depth of Field and Lens Equivalents with sauce and bonus material at: 🤍filmmakeriq.com/courses/focusing-depth-field-lens-equivalents/ If you have any further questions be sure to check out our questions page on Filmmaker IQ: 🤍filmmakeriq.com/balcony_categories/questions/ *ERRATA* The ISO in regards to Lens Equivalents should be multiplied by ISO^2 because we're dealing with two dimensions not just one. Multiplying by just the ISO will result in slightly darker image (as see in the demo) Some people have jumped to the conclusion that the Circle of Confusion is the Pixel Size. The CoC is LIMITED by the Pixel Size in that it cannot be smaller than the pixel size, but in most cameras the pixel size is much smaller than the CoC (or at least by a standard CoC that calculators use for determining depth of field). This explains why a Full Frame 12MP camera will have the same DoF as a 50MP camera. But if you enlarge the photo enough, eventually you will be able to see more detail in the 50MP image which less of what looked in focus in the 12MP image will actually be in focus. Some people have commented that the video is a bit soft... when I'm large in the shot, it does indeed look soft - when I'm shrunk down, the video looks sharp. The lens has not changed - only the magnification of the image. This is a very real analog to what's happening in smaller sensors - when a small sensor crops in you can see better detail and it looks soft, when captured by a full frame, the image looks sharp. Therefor smaller sensors (given all other factors equal) have a shallower depth of field.

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Focusing on Depth of Field and Lens Equivalents
Focusing on Depth of Field and Lens Equivalents
Focusing on Depth of Field and Lens Equivalents
Focusing on Depth of Field and Lens Equivalents
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Комментарии пользователей:
Mirage Leung
2022-05-05 04:42:33

You are magnificent, I've been so confused about focus vs depth of field for so long

Angela Svoronou
2022-05-04 05:59:06

Thank you so much for this great video!

FilmQi
2022-03-30 09:05:23

Nice video, thanks for sharing!

Thanh ngo
2022-01-09 17:53:32

Thank so much, this is the best explanation about lens !

Duc Anh
2022-01-02 20:23:50

Some segments in the video are stamped not adjacent to each other

RumorsCAMERAS
2021-12-11 20:30:34

you re constantly out of focus while teaching about focus.

Thọ Võ
2021-12-09 18:39:54

Character In the video It's great, I like it a lot $$

Mai Le
2021-11-29 21:12:00

Some segments in the video are stamped not adjacent to each other

Christopher Grove
2021-11-02 20:42:24

🇨🇦/🇺🇸... Thanks... when I frustratingly try to describe Circle of Confusion to others, I'll just point them to this, excellent video!
NOW... if only I had a video describing sensor pixel pitch in relation to the number of megapixels, tripod vibration damping (as opposed to stiffness) and the diffusion of lens glass!!! 🤔

Léon Frey
2021-10-25 09:18:08

Another awesome video, thank you!:)

MrBratkenSolov
2021-10-21 19:21:22

Underrated video

Paul Engle
2021-09-25 20:43:45

Holy shit , this channel rocks. Great video. The multiplying/dividing the 1.4 to get the next stop or light was youtube.com/results?search_query=%23gamechanger #GameChanger

Mark
2021-08-28 21:59:41

I know im like 5 years late to the party, but I love how you used the Stephen King theme while explaining.

Michael Oluwasogo
2021-07-31 07:29:09

I love your videos. How do you use the focus chart?

Juliano Alves
2021-07-05 02:52:17

Great content!! Tnks for all the support for the photography community!!

Franklin Michael
2021-07-02 15:55:21

So smaller sensors have a shallower depth of field than larger sensors *if they have the same resolution*, right?
So this means that the sony a7siii has deeper depth of field than the a7riv for example? Since both are full frame cameras but one has 12megapixels crammed into the sensor and the other has 61 megapixels crammed into that sensor?

I have a question, if a 50mm f2 on a camera with a x1.5 crop factor is equivalent to a 75mm f3, and you have a full frame camera and a crop factor camera with the same resolutions, then each pixel on the crop factor camera will be smaller and therefore will have less photons hitting it in the same amount of time, right? Then will an APS-C camera be as noisy at ISO 1000 as a full frame camera would be at ISO 1500? Assuming they are both the same resolution and use the same lens

jj cale
2021-04-17 21:19:49

And this concludes as the only valid demonstration of DoF, focal length and crop factor hysteria on YT. Thank you for a coherent and scientific explanation!

Stephen Victor
2021-03-27 15:53:54

I Salute you! I honor and respect you and all you have gone through to get you to your levels of intelligence, wisdom and skillfulness in communicating (teaching) so effectively. I am new to photography and self taught. I did not know what I did not know. Inasmuch I remained niggled by a prompt to remove this ignorance of the physics you so eloquently explained / demonstrated. I now know what I do not know. I will avail myself of your body of work. Thank you!!!

JustVape Br
2021-03-01 22:29:06

The lens is measured in millimeters, why use inches to DOF??? Keep it real.

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