Tag Archives: aperture

Teleconverters and aperture factors – f stop.

Posted on February 25, 2013 by janpenguin

300mm f4 lens with 1.4x converter produces f5.6. Excerpt from LensRentals.com The teleconverter reduces the maximum aperture of the lens by one stop (1.4x converter), 1.5 stops (1.7x converter) or 2 stops (2x converter). An f/4 lens becomes an f/5.6 lens … Continue reading →

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How to block excessive light in daylight?

Posted on October 12, 2012 by janpenguin

Yesterday I learned I need something to block excessive light for long hours of time lapse photo. The ideal setting for time lapse photo for a day is to use one aperture, shutter speed, and ISO number. ND (Neutral Density) … Continue reading →

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Six correct exposures

Posted on July 29, 2012 by janpenguin

When ISO speed is fixed, digital camera has at least six correct exposures that produce identical photo images theoretically. To take clear and sharp photo without tripod and remote trigger, I put my camera on a box, mirror lock up … Continue reading →

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Sample photos in manual mode: aperture, shutter speed, ISO

Posted on May 2, 2012 by janpenguin

Shutter speed is 1/number. Aperture is f/number. ISOspeed is number. For example, a photo taken shutter speed at 1/40 seconds, aperture at f/5.6, ISO at 400 will be written 40 / 5.6 / 400.

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