scale focus?, zone focus?, hyperfocus ?

[fursan]

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Folks, are we loosing focus?

 

Are these the same as I am used to in the dslr world, or do I have to learn a

different vocabulary?

 

charts would tell me the hyperfocal point for a given fl,aperture and coc. Has this

all changed since I moved over to rf?

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[stunsworth]

Yeah, they're all the same. But you ought to be aware that you don't have the same leeway with digital, so use the range indicated by 1, or more usefully, 2 stops wider than the aperture you're actually using.

[fursan]

Yeah, they're all the same. But you ought to be aware that you don't have the same leeway with digital, so use the range indicated by 1, or more usefully, 2 stops wider than the aperture you're actually using.

 

Steve,

 

Thanks. Could you pls give me an example.

Best.

[stunsworth]

Sure, if you are using a lens at say f8, you'll see an indication of the distance that should be in focus by looking at the f8 markings on the lens. Instead of using the f8 markings use the f4 ones instead.

 

Hope this helps.

[fursan]

Sure, if you are using a lens at say f8, you'll see an indication of the distance that should be in focus by looking at the f8 markings on the lens. Instead of using the f8 markings use the f4 ones instead.

 

Hope this helps.

 

Steve,

 

That helps a lot. guess puts me in focus!!

 

Take care.

[mmk60]

Sure, if you are using a lens at say f8, you'll see an indication of the distance that should be in focus by looking at the f8 markings on the lens. Instead of using the f8 markings use the f4 ones instead.

 

Hope this helps.

 

Hi Steve

 

Would you, if you do not mind, please explain why?

 

Cheers

 

mashu

[stunsworth]

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The markings aren't a scientific way of deciding when something goes out of focus. In essence they indicate what is acceptable as a level of out of focus. With digital this seems more critical.

[Jack_Flesher]

The DoF markings on a lens are determined by DoF calculations the factory that built the lens used. And DoF calculations are dependant on something called acceptable "CoC" or Circle of Confusion. What this is, is simply how fuzzy a point-source of light can become before we see it as fuzzy and not a point source. With film, enlargement factor played a significant role in determining CoC. With digital however, CoC has become de-facto the diameter of a single pixel, which is a ridiculously small CoC value. And small CoC values drastically narrow the usable DoF in any DoF formula.

 

The reason is because with digital we can now zoom right in to 100% view. Think about it this way: Most monitors resolve around 72 pixels per inch. The M8 file is roughly 3900 x 2600 pixels. Dividing by 72, when we view our files at 100% on a computer monitor, we are effectively viewing images that in 35mm film parlance would be 54" x 36" prints from an 18" viewing distance!

 

Now you know why all of sudden everybody is hyper aware of back-focus and front-focus issues as well as lens performance! They were always there, just nobody ever noticed them in an 8x12" print

 

Cheers,