Confusing Photographic Terms Explained (confusingly) (dom bower)

[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.

[stewiek]

fourthirds and microfourthirds! :)

[salvation72syndicate]

LOL! the Owl!

[pokteak]

thanks man!!!

[SopuchLoveHardrock]

This owl is amazing!

[TheUncannykodiak]

Dude, actually; i dont know why, but that did make alot more sence than others when they try and explain it. wow. Well done . Cheers!

[jbrecording]

confusing indeed lol - so my Rebel XSi with a 35mm prime.... in the viewfinder it looks like a 50mm but it's still only capturing the image on the sensor as if its 35mm???

[ecyor7]

no matter if ur lens is fx or dx the image going through is the same. Its the sensor that determines the cropping, or "equivalent".

A 35mm FX format lens on a DX sensor will still have 35mm of image but since DX sensor crops it, it will become 50mm (more tele) ....

[onlysirdave]

ooops Dom you should have waited a few days leica Just announced a kind of medium format sensof 35mm + 60 % more at around 35mp so now we have 3 sizes that is if you can swing $40,000 us for a body and 4 lenses

[dombower]

@onlysirdave jsut did a review of the article about that lens in professional photographer magazine

[spaghetti1977]

forgot to say - I like the owl at the beginning of the vid! lol

[spaghetti1977]

haha! this video made me laugh a lot! I share your confusion with explaining photographic things, but for me I did follow you and you did explain something I didn't know which was field of view - which I guess is your angle of view is it?thanks!

[dombower]

@spaghetti1977 field of view or angle yeah same thing.

[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]

@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.

[sandsultan]

Dom do you think film slr is better than a full frame dlsr? never mind the convenience just image quality.

Do you even use film slr?

[dombower]

this is not a simple question. film and digital have their strengths.

For portraits i saw a gadget show where they used the nikon d700(12meg)vs the top nikon film camera (cant remember) and then printed out the images to the size of a building and the digital won the contest.

but for items like landscapes then i would go with film as it has more dynamic range than digital at the moment unless you look at the fuji s5pro. Image quality can depend on the iso and film iso above 400 not great

[ubergeek9]

The film used would have a massive effect as well.

[rhowell5]

FINALLY!!!! Someone to explain FX and DX and how it pertains to lenses!!! About time.......Yes is did help, thank you!!!

[dombower]

brill! from your message i now see that it was worth my time making thevideo, thanks for your comment!

[GLXLR]

And Cropped+ Fullframe have slightly different DOF. I think to get the same bokeh as a FF at f/2.8 (at the same distance), you would need a f/2 lens on a 1.5X cropped body. Not sure about Canon or Olympus.

[dombower]

no that was the whole point of this video. the there is no change in DOF!

[ubergeek9]

Well - on full frame DOF is always shallower due to a larger focal plane. But this isn't because of the lens.

[dombower]

the shallower depth of field is a bit of an optical illusion for example if you shoot something from a slany angle on a crop sensor the part thhat is in focus takes up more of the image than a full frame, but the bokeh and perspective remains the same.

[GLXLR]

I'm pretty sure it is slightly more shallow on FF. DOF is created on the size of the aperture corresponding to the sensor size. However, it isn't that big of a difference.

[GLXLR]

Lots of people still use film though.

[JD95]

Haha, great explanation:-) It took me a while to understand the whole concept when I first started digital.

Oh, and btw, lot of people still use film:-)

It's not "that" old... lol. :)

[dombower]

yeah but those people are old, and dont understand technology.... ;)

[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:)

[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]

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:)

[phototecglobal]

HaHa! Well done! It's one them topics u understand yourself in practice & theory, but trying to explain it without demo's in a 10m slot can get a wee bit complicated at times! Nicely done though!

[brt5470]

When talking about 35mm film, It should be about 35mm wide, but with since it's a 3:2 ratio it would be 35mm x 23mm.

I think.

[wxb200]

That made a lot of sense... I'm still lost and dont mind, though! Thanks! What? Oh yeah, awesome! The "Year One" movie looks like its going to be funny... That is all I have to say... You have been warned? Yeah...

[sbs260]

whoa that really did help

thanks dom

[erikRairden]

I think at 3:46 you meant to say "FOV" instead of "DOF".

[dombower]

no a 24 mm lens will have the same fov as a 50mm (or there abouts) but its depth of field is not like a 50mm.

i think i kept it correct.

it did take a lot of concentration!

[germadonna]

Yes it helps thank you.