09-28-2014 07:40 AM - edited 09-28-2014 07:42 AM
Hi, I have Canon 1100D and Canon 50mm 1.8 lens.
I want to buy another lens and i need to take full body shots with it and to have a lot of bokeh (or depth of field)
and i want it to be sharp.
now because i have a crop camera the 85 will be 136mm..
but my question is if to upgrade the 50 to 135 or to go straight to the 135?
there are a lot of difference between the 50 and the 85??
Thanks 🙂
09-29-2014 12:16 AM
09-29-2014 08:24 AM - edited 09-29-2014 08:26 AM
@gsbuah wrote:
im not so good in English, but if i understood your saying, I've already taken pictures with depth of field and bokeh as well, so i don't think what you said is accurate..
and I'm 16, so i must be wrong, but that what i was taught so maybe our definitions are a little bit different.
I assure you that you are far better at English than I am at your native language. But let me try to clarify a bit:
A lens's depth of field (i.e., the range of distances between the subject and the focal point at which the subject will be perceived to be in focus) varies with its focal length and with the size of the aperture used. It's greatest for a short focal length and a small aperture and least for a long focal length and a large aperture. In many (perhaps most) cases a large depth of field is desirable; it makes it easier to keep major elements of the image in focus.
But a small depth of field has its own advantages. If you want to emphasize one element of a picture and get rid of other elements that may serve as distractions, one way to do it is to focus on the important element and throw the rest out of focus. That usually requires a small depth of field, so you use a longer lens and/or a wider aperture to achieve it.
The term "bokeh" (a word supposedly adapted from the Japanese language) is a measure of the attractiveness of the out-of-focus portion of the image. Different lenses handle them differently, and what is considered attractive in such circumstances varies from person to person, so "bokeh" is a highly subjective term. But there's enough agreement overall to allow many lenses to be categorized as having good or bad bokeh without too much argument.
In your case, it sounded as though you were looking for both good bokeh and a large depth of field. But in a way, that's contradictory. If the entire image is in focus, the term "bokeh" doesn't apply. If almost all of the image is in focus, the bokeh doesn't matter much. So if you want to be sure that we understand what you're looking for, you need to be more precise about how you're using the terms "depth of field" and "bokeh".
When I was 16, I got my first adjustable camera, an Argus C-3. I'm now almost 77, and I've had a long, sporadic relationship with photography. The advent of the digital camera rekindled my interest, and I'm now a serious photographer for the first time in my life. You're lucky to be starting out with a range of available technology that I couldn't have dreamed of. Work hard at photography, and it will likely bring you great satisfaction all your life.
09-29-2014 09:59 AM
" If the entire image is in focus, the term "bokeh" doesn't apply."
Oh, but it does, Bob from Boston. All lenses have 'bokeh'. It is simply the degree that seems to be afftected by DOF.
It may be easier to say bokeh is either soft (pleasing) or harsh (unflattering).
Bokeh happens in parts of the scene that lie outside the DOF. It is most often seen around background highlight points.
It is caused by aberations in the lens, aperture shape and number of aperture blades and other parts of the lens' design.
DOF simply moves it's appearence closer or farther away in the photo.
All this is tied together. It has a great deal to do with where you stand in relationship to your subject. Along with focal length and aperture.
This young photographer probably wants a large aperture medium focal length lens. The 50mm f1.8 is giving him what an 80mm f1.8 will see basically. Considering cost this may be as good as it gets for him. The 85 mm f1.8 could be a choice (close to 135mm in relationship).
(BTW, I got my first real 35mm camera in 1955. It was an Argus C3 and I still have it.)
09-29-2014 12:12 PM
@ebiggs1 wrote:" If the entire image is in focus, the term "bokeh" doesn't apply."
Oh, but it does, Bob from Boston. All lenses have 'bokeh'. It is simply the degree that seems to be afftected by DOF.
It may be easier to say bokeh is either soft (pleasing) or harsh (unflattering).
Bokeh happens in parts of the scene that lie outside the DOF. It is most often seen around background highlight points.
It is caused by aberations in the lens, aperture shape and number of aperture blades and other parts of the lens' design.
DOF simply moves it's appearence closer or farther away in the photo.
All this is tied together. It has a great deal to do with where you stand in relationship to your subject. Along with focal length and aperture.
This young photographer probably wants a large aperture medium focal length lens. The 50mm f1.8 is giving him what an 80mm f1.8 will see basically. Considering cost this may be as good as it gets for him. The 85 mm f1.8 could be a choice (close to 135mm in relationship).
(BTW, I got my first real 35mm camera in 1955. It was an Argus C3 and I still have it.)
I guess yiou're lumping coma, chromatic aberration, and other aspects of sharpness and distortion under the rubric of bokeh. Which is fine, although virtually every instance of the term that I've ever seen was a reference to the OOF portion of an image. So I guess I'll stand by my definition while acknowledging the validity of yours.
As I recall, I got my C-3 for my 16th birthday in 1953. And yes, I still have it. I think I may even have a telephoto lens for it. It may be worth more now than my Nikon F-2, since it's more of an antique.
09-29-2014 12:56 PM
"... was a reference to the OOF portion of an image."
It does. And, yes, all the characteristic of a lens contributes to the bokeh.
Bob from Boston, you do know how many C3's Argus made? Plus all the various models and variations of it? But it does make a nice paper weight!
10-01-2014 06:16 AM
10-01-2014 02:37 PM
10-01-2014 05:06 PM
Scott you are spot on with that advice.
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