A Marcus

When you take a picture using flash, the exposing light is a product of the flash; its color differs from the ambient light that illumines the scene. You see the subject via the ambient light; the ...

Sometimes we get lost in the minutia. Focal length determines the size of the image; the longer the focal length, the larger the image. The image of objects produced by a 100mm lens will be twice ...

The optical industry uses the focal ratio (f-stop) as a measure of how much light energy one lens produces as compared to another. A giant lens 1 meter in diameter with a focal lenght of 10 ...

The f-stop is a ratio. A ratio is dimensionless. The f-stop is universal. The f-stop does not change format to format. The reason for the f-stop system, it allows us to pass exposure information ...

An f-stop is a 2x (double or half) change to the light energy of the exposure. The f-stop number set is: 1 – 1.4 – 2 – 2.8 – 4 – 5.6 – 8 – 11 – 16 - 22. Note each number going left is an aperture ...

The ideal travel camera is a point-and-shoot with a zoom lens. Most all high-end models have several modes. They all do a great job. Some have GPS. This is a great feature. Image files have ...

A 0.71 speed booster alters the focal length of the lens it is mated with. Thus the 35mm focal length lens becomes 35 x 0.71 = 21.81mm let’s say the final focal length is about 22mm. The original ...

The f-number is a value that opticians use to relate image brightness as projected by the lens. A camera lens acts like a slide or movie projector in that it projects an image of the outside world ...

Camera lenses of yesteryear were simple; often made using just one glass lens. Today, lenses are more complex being made using several individual glass lenses, each called an element. A modern ...

As a general rule of thumb, enlarger lenses are optimized to work a flat-to-flat. In other words a flat negative and project it on a flat piece of photo paper. A camera lens, in most cases is ...

Glad I could help - once you figure out the focal length of this lash-up -- can help with angle of view etc. Alan Marcus

A prime lens is one that has a fixed focal length. Camera lenses act much like a projector lens in that they project an image of the outside world onto the surface of photographic film or a ...

First you need to discover the effective focal length, taking into account all the stuff you attached. Here are two methods; both involve knowing the magnification of the resulting image. Not as ...

You can set focus to the hyperfocal distance. H = (F x 1000 ) / f Thus F = 16mm f = 2.8 Math is (16 X 1000) / 2.8 = 16,000 / 2.8 = 5,714mm = 5.714 meters = 18 3/4 feet.

Focusing on infinity is likely not a problem. You can focus on distant street lights, or mountains, or clouds, etc. As a rule of thumb, infinity is about 3000 x the diameter of the lens aperture. ...

Lenses are fitted to cameras based on the size (height & width) of the format. The full frame film camera 35mm film size measures 24mm height by 36mm length. We measure the corner to corner ...

Photographic Lenses by C.B. Neblette and Photographic Optics by Arthur Cox and Introduction to Photographic Principles by Lewis Larmore --- site Rayleigh Criterion.

No freezing spray at local market, only at electronic parts store. However, spray wart remover is a freezing spray.

Try cold! First cold air from outlet of your car's air conditioner. The idea is, cold causes metal to contract. You want to cool the filter ring and not the lens. Not an easy task. If cold air ...

There are two mechanical shutter designs. Each have advantages and advantages. The between-the-lens shutter was popular; it uses metal leaves that overlap. When the go-button is pressed, the ...