jonas lee photography
One Hundred 08/24/2010
 
(At the PNE 100-year anniversary parade in Vancouver, BC.)
 
Panama Crab 08/07/2010
 
 
Mini Daisy 08/05/2010
 

Stanley Park, Vancouver, BC, Canada
 
 
I have quite a few vintage photos that were separated from their families (--estate sales?). I started a page HERE, which is search-engine-ready. Hopefully a family member searches for the peoples' names in Google!
 
 
Third in a series exposing stupid slogans.
 
 
This diagram is my attempt to explain the '35 mm equivalent' focal length. The properties of the lens do not change if you move it to a 35mm camera; however, the experienced focal length will be different because of the different sensor sizes. The larger-frame photo (whether from the 35 mm camera, or the one being compared) could be cropped to give the same photo as on the other camera, notwithstanding a possible difference in resolution, for better or worse.
Picture
click to see larger version
As with film cameras, digital cameras have a wide range of sensor sizes. Somebody using a digital camera with a full-frame (36mm x 24mm)* sensor would experience the focal length of their lenses precisely the same as if they used the same lens on a 35mm camera; i.e., the conversion multiplier is 1. This "crop factor" for your camera is the ratio of the length of the diagonal across a 35mm frame to the length of the diagonal across your sensor. You can usually find this number in your camera specifications; otherwise, see below for calculating it yourself.

A camera with a factor larger than 1 has a sensor smaller than full-frame. The smaller the factor is, the larger the camera's sensor is. (And likely the more expensive the camera is!)

Do not be fooled by little cameras with 15 megapixels. If the sensor is only 7mm wide, you might prefer the output of a 5 megapixel camera with a larger sensor.

Calculating the Crop Factor
To find the crop factor, or 'focal length multiplier' (FLM) for your camera, find the sensor width and height from the camera specifications and follow these calculations:
x = sensor width
y = sensor height
d = sensor diagonal
C = 43.27mm [35mm frame diagonal]
f = C/d = FLM

Pythagoras: x² + y² = d²
so: d = √(x² + y²)
ratio of full-frame diagonal to this camera's sensor diagonal: C:d
so, crop factor: f = C/d

For example, a Panasonic Lumix G Series digital sensor is 17.3 by 13 mm:
d = √((17.3)² + (13)²)
d = √468.29
d = 21.64 mm
f = 43.27mm / 21.64mm
f = 2
The sensors in the G Series cameras have a FLM of 2. Therefore, if you set the built-in zoom lens at 50mm, the '35mm equivalent' will be 100mm. This means that if you put a 100mm lens on a 35mm camera and look through the viewfinder, you will see the same thing (and take the same picture, in terms of zoom and cropping), as you would with this Panasonic at 50mm.

*35mm film is so-called, because the measure across the film strip (including the perforations) is 35mm. Only 24mm of this are used in development, and 36mm in the other dimension, giving the common 24/36 = 2:3 ratio for 4x6" and 8x12" prints. This full-frame size is also called 135 format.
 
Grizzly Photos 07/20/2010
 
Click on the image to see these incredible photos of grizzlies in... Russia?
Picture
 
 
Canada Day in Langley, BC.
 
Lollipop 06/11/2010
 
E looking at her lollipop; i like the drip on her chin! :)
 
Remember 06/06/2010
 
There was a WWI Canadian vets remembrance ceremony in our backyard. (Cemetery.)