Sunset in Kruger

by MrFrench

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2

Even though the distance of various stars from your camera on Earth can vary by astronomical distances, they are all far enough away that the light from them enters your lens as collimated rays. This means you don't need much depth of field because the lens must be focused to precisely infinity for any and all of them to be in sharpest focus. The reason the ...


5

You don't need to use the widest aperture. In fact, in many cases, using the widest aperture for astrophotography can result in very poor quality stars. If you are doing wide field untracked imaging (i.e. milky way imaging), then you can usually get away with using maximum aperture, and the larger aperture allows you to use shorter exposures, which reduces ...


2

Widest apertures allows you to capture more light, and using a wide angle lens, the depth of field is considerably bigger. And if you focus at infinity, basically nothing will be out of focus. ;)


3

The only difference in terms of sharpness I see is that the first shot appears to be at f/2.8 and slightly front-focused, while the second appears to be shot at f/1.8 and either slightly front focused if you are aiming for the branch in the left central area or grossly back focused if you were aiming for the nearer branch. When viewed at the same display ...


1

Prime lenses are generally sharper due to the reduced diffraction by not having the extra lens elements required for zoom lenses. A prime lens, even a cheap one, is a master of one focal length, that's all it needs to do and generally, it does it as well as the glass permits. Whereas, a zoom has to get it right over a much larger focal range, in other ...


1

The 24-70 is an f/2.8 lens. You are shooting at f/2.8. The lens is fine. Read up on what Depth Of Field is and you will understand why your pictures appear blurry. They are not, you are just using a small Depth Of Field.


1

The simple answer is you can get shallow depth of field (hence bokeh) with any camera system if you focus close enough. Finite depth of field arises due to the inability to focus light coming in at different angles in the same plane. When light is focused at the wrong distance is appears as a spot the shape of the aperture, instead of a point. Large ...


0

If a camera is focused at infinity, then the size of the blur circle for an object at a given distance is the same as the size of the lens aperture. So if the iPhone camera has a 1 mm diameter lens aperture, and if focus is set to infinity, then every object is blurry at the 1 mm level: which is not detectable on a tree a hundred meters away, but is ...


1

You mentioned four factors from your reading (lens diameter, lens size, distance ratios, and print size), but the only ones that really matter are the first two - or, more specifically, the lens iris (the diameter of the opening that lets the light in, not the physical lens diameter) and the lens focal length (the distance from the center of the lens to the ...


13

Many older or cheaper phone cameras use a "fixed focus" lens. ie it is always set to focus a specific distance away from the camera. This is usually set to the "hyperfocal distance", ie everything from half that distance out to infinity is in focus. This depends on just what is acceptable as 'in focus'. But most photos from these cameras will be sharp ...



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