Confusing Photographic Terms Explained (confusingly) (dom bower)

http://www.dombower.com

Here i try and explain the difference in fx and dx sensor sizes, full frame and cropped. Also how this cropping of the sensor affects Depth of Field (DOF) and Field of View (FOV)

hope this helps explain some things for some of you

regards

dom bower

www.dombower.com

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• explained
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• dx
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• film

[akeu08]

Hi,

Man, great videos. Could you please explain "stops". What does it mean in case of filters. What setting should I have when using polarizer or graduated? You know what I mean?

Thank You for answer in advance :) Cheers

[dombower]

@akeu08 i shall make a little video of this. a stop is a double or a half the amount of light into a camera, equallying doubleing or halfing the speed of the shutter.

[GLXLR]

Actually I realized that the bokeh is the same if you use two lenses because the DOF is determined by 3 things: sensor size, focal length, and aperture. SO if you put a 85mm f/1.8 on 1ds and 85mm f/1.8 on 50D, they would be the same DOF because the 85mm on the 50D would be a 136mm f/2.5. Even though the effective DOF aperture (still collects the same light as f/1.8), the focal length is increased so that it produces the same bokeh as the 85mm on the 1ds.

[dombower]

@GLXLR dof shouldnt be affected by sensor size, more subject to camera distance and minimal focusing distance.

[surferboy36O]

Part 2: This effectively changes your DOF and "bokeh" size, maby you won't notice it in 24mm lens, but it's much more evident in a telephoto. You also have to take into consideration lens construction differs from lens to lens, so you'll have to check your lens's DOF table or DOF scale to campare for example a 35mm in a cropped body against a 50mm in full frame.

[surferboy36O]

0:54 24x36 millimiters, 43mm diameter, 35mm wide, I know it by heart. Actually the DOF does change if you chenge the sensor size (you contradicted yourself at 3:46, haha). Suppose the acceptable diameter for a light point source to be in focus is 1% of the image lenth (36mm), that's 0.36mm, say you have one in your picture. If you change the sensor size for an ASP-C, your lenth is 24mm and the acceptable diam. would be 1% of 24mm = 0.24mm, so now your subject is officially out of focus.

[surferboy36O]

@GLXLR No, if you use the same lens in two cameras , the DOF (distance in which the subject is in acceptable focus) changes because of the magnification effect, and the "bokeh" also changes. The focal lenth and aperture stay the same, only the sensor size changes.

[stewiek]

fourthirds and microfourthirds! :)

[salvation72syndicate]

LOL! the Owl!

[JD95]

I didnt know youve worked with many of the top photographers so Im sorry about my part but digital and film are really 2different things. Im not trying to arguehere with you so dont get me wrong but I don't want photographer beginners hating film without really knowing it. If they had full experience with film and they still don't like it I would understand:) But its to bad film photographers around you areshallow minded.I shoot bothfilm and digital butthe experience you get are both amazing:)

[dombower]

@JD95 most top photographers??? not from my experience, some do, many will still have a film camera but will shoot 99% with digital. and the oldness is in reference to people not even knowing about digital, not making a conscious decision to stay with film.

[JD95]

Those people are old?? Most of the top photographers today use film, take for instance Annie Leibovitz, David Lachapelle,etc. And without theinvention of film, wouldn't have even existed:) In my opinion, I think photography today rely too much on post production and it is easy to forget the whole concept of getting the "perfect" shot on the spot. (they always have in their minds that they can fix it later if something is wrong with it) Yes, Technology has helped and is awesome but so is film:)

[pokteak]

thanks man!!!