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Results tagged with aperture
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user 70370
Aperture is the opening in the diaphragm of a camera lens. For questions relating to Apple's photo management software, please use [apple-aperture] instead.
2
votes
What does it mean to have a fixed lense aperture with variable camera aperture?
What is meant by fixed aperture is that the maximum aperture does not change when the focal length changes... i.e. it is not a variable aperture zoom lens like the 24-200 f/4-6.3 is. … The aperture does change based upon the aperture set by the camera. …
- 19.4k
1
vote
Why 1 sunbeam for each aperture blade in your lens?
Each straight(er) edge of the aperture causes a diffraction spike that has two points/sides in the resulting image. …
- 19.4k
1
vote
Is using a low F-number (wide aperture) for landscape photography a good practice?
Light itself is sharpest when there is no obstruction/aperture. … When the wavefront of light has to pass through a restriction/aperture it creates a new pattern which spreads out... this is called diffraction. …
- 19.4k
0
votes
What are the technical reasons to design lenses with oddly shaped apertures?
A more rectangular aperture could improve image quality by blocking light that does not conform to the image format/area... much like the lens mask/aperture of the Angenieux design lenses, rectangular … It would actually be less effective in correcting errors than a more rounded aperture but would allow a little more light (acting as a larger aperture opening with something of a "faded edge"). …
- 19.4k
2
votes
EOS 250D the aperture changing only when picture is taken
Many cameras have the ability to show the image/exposure preview full time while in live view... which includes having the aperture stopped down to the exposure setting. …
- 19.4k
2
votes
Should I use rounded or exact f-stop values for a depth of field calculator?
F# is only accurate when focused at infinity, because the lens' stated focal length is only accurate when focused at infinity.
Combine that with rounded focal lengths and F#'s, that DoF and hyperfocus …
- 19.4k
0
votes
Relation between half angle of numerical aperture and angle of view
θ is the half-angle of the lens' angle of view.
- 19.4k
3
votes
Aperture not opening completely when set to completely open
The Nikon CX lenses are known to have issues; particularly a small plastic gear that slips out of place and aperture control malfunctions. …
- 19.4k
-3
votes
In-between aperture settings on the Fuji GW690 III
The aperture adjustment on the GW690 III only has the full stops numbered. Similarly, the shutter speed is only numbered (selectable) at full stop intervals. … However, the aperture can be set to 1/2 stop values (the in-between detents); or even in-between the detents. …
- 19.4k
2
votes
Accepted
How to maximize depth-of-field with a tripod
Light itself is sharpest when it is not interfered with... i.e. when there is no aperture involved. However, that is not possible; so light itself is sharpest when the aperture is the largest. … (note that the light/traces from the narrow aperture image are also w/in the wide aperture; just not shown for simplicity). …
- 19.4k
24
votes
Accepted
Can this strong directional blur at wide apertures still be explained by the usual arguments?
That appears to be a pretty bad case of a decentered element.
Here's a simple test using a siemens star; you don't even need to print it, it can be displayed on your monitor.
- 19.4k
-2
votes
Using FF lens on APS-C changes lens aperture value?
Multiplying the focal length and aperture by the crop factor is known as "equivalence." … The aperture value of a FF lens does not change; the smaller sensor just doesn't make use of all the light (crops it away). …
- 19.4k
0
votes
How will a teleconverter affect the sharpness of a lens at a given aperture?
A teleconverter magnifies the image after the lens has done its' job... it basically just increases the size of the image circle so that you get a (greater) crop factor from the sensor. The effect is …
- 19.4k
1
vote
Accepted
Why does changing aperture change field of view in my reverse-lens macro setup?
The aperture of the rear lens should be wide open and you adjust the aperture of the front lens.
See here for more: http://www.coinimaging.com/coupled_lenses.html …
- 19.4k
8
votes
Under what circumstances does f/22 cause diffraction?
All apertures cause diffraction... what you are asking is when does diffraction limit resolution.
The moment the airy disk (lens projected point of light) is larger than the photosite (pixel) recordin …
- 19.4k