Aperture?
Jan 31, 2019 07:04:12 #
Delderby wrote:
Rules of thumb are often the only "rules" we have when in the field, often needing a quick shot. Please provide your alternative methodology, or just..........
Or just read what I have already posted. Knowledge is power.
Jan 31, 2019 11:10:52 #
selmslie wrote:
All of my SLRs, including Hasselblads, have had a DOF preview function. I can also stop down my view camera lenses manually.
But the focus screen gets so dark you cannot evaluate anything at all, let alone DOF. It doesn't work an better with mirrorless.
That's why the feature may no longer be found.
But the focus screen gets so dark you cannot evaluate anything at all, let alone DOF. It doesn't work an better with mirrorless.
That's why the feature may no longer be found.
Thanks, I just learned something new. I had not noticed how dark the image can appear in the view finder when that button is pushed. Years ago when I first had a camera with that button, my main interest was in producing out of focus backgrounds, so I was checking DOF at larger apertures. At values of f6 or less, the darkening effect is less pronounced and not noticeable at all at f4. I guess it never occurred to me to use that button to check the DOF at f7 or above. At f11, just about everything is in focus anyway, why check? But you are correct it does get quite a bit darker at those aperture. I haven't use that button in years because once I understood the effect of aperture I really didn't need to use it anymore. However, I just checked that with my D500 at f16 in daylight, the view is darker, but not unusable and the effect is clearly visible.
Feb 3, 2019 22:18:50 #
This image helps explain what I was referring to in this post. Light rays from point 2 converge on the sensor plane as a point and are therefore in focus. Rays from points 1 and 3 are farther and nearer than the focal point and create out of focus patterns. When the aperture is introduced it blocks part of the oof rays and creates a less blurry image on the sensor plane.
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