A Marcus

We are talking about clamp-on supplemental lenses that mount atop the camera lens. Use of these supplemental close-up lenses are a time-honored method that allows cameras to work in closer. When ...

My career revolved around “Photofinishing”, more than 50 years in this business. I am taking big labs, was technical manager for 7, each sized handle 20,0000 rolls of film a day. Sparks fly when ...

Diffraction well studied by John Strutt, 3rd Baron Rayleigh (Astronomer Royal) published what is now called the Rayleigh Criterion covering the theoretical maximum resolving power of a lens. ...

The camera lens works by fracturing a vista into countless tiny points of light. A perfect lens would render them so tiny that they would be dimensionless. Such a lens has never been. Instead, ...

The digital sensor chip converts feeble levels of light energy to electrical charges which are weak and thus need amplificon. Each photosite has an amplifier and the expectation is, all will work ...

The photographic community has empowered the International Organization of Standardization (ISO) Geneva, Switzerland, to establish methods to assign a numerical value for sensitivity to light for ...

The comparable exposure for a full moon vista using 100 ISO and an aperture setting of f/16 required a time exposure duration 32 minutes = 1,920 seconds.

The working diameter of the camera lens is controllable; we adjust to modify image brightness. As we adjust, the Iris (named for Greek Goddess of Rainbow), image acuity and depth of field alter. ...

Celestial objects appear to move in a circular path as the earth turns on its axis. Thus, the stars and planets appear to move in a circular path that is centered around the celestial pole. To ...

@ Jim Kasson – Ever teach newbie about technical stuff? – I have – you lay down a foundation – sorry you don’t agree to my approach – it works -time tested by me – why interfere with a teaching ...

Making a faithful image has taken nearly 200 years, and so far, no cigar. Early black & white films were only sensitive to violet and blue. The images they made failed to deliver correct ...

The job of the camera lens is to project an image of the outside world onto the surface of the camera’s digital sensor (or photo film). No single lens shaped piece of glass can do this task and ...

You are seeking magnification 1 otherwise know as life-size, often called “unity”. In other words, the image of a 35mm film 24mm height by 36mm length is projected on the sensor at life-size. A ...

@ Sadwutch  -- A tip of the hat from Alan Marcus

@ Dave We (they) don't view the image of a tiny sensor; we view a magnified (magnified) verson on computer or TV screen. Your explanation gets an F from me.

@ Graig Gillette A rose by any other name will smell as sweet - same for magnification vs. enlargement. Crop Factor often called magnification factor. Why this obsession? The image produced by a ...

@ Bob A I was trying to explain the concept of comparing the FF to APS etc. using a crop factor. I used the 8X binocular because these are common. The original post described a 900mm. A 2000mm on ...

You should know, the 35mm film frame measures 24mm height by 36mm length and this rectangle has a diagonal measure of 43.3mm (round up to 45mm). This data is key to your question because this ...

I cannot tell from your image if there is any damage. An SLR (single Lens Reflex) camera uses a mirror inclined at 45° to intercept the projected image produced by the lens. This image plays on a ...

Depth-of-Field calculations yield vague results because the inputted values are subjective. These are assumptions, such as – The resulting image will be viewed from a distance about equal to the ...