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Here is another learning series article and video. This time I go over the camera lens aperture. Check out the video on YouTube: The camera lens aperture is the variable opening inside the lens that lets more or less light into the camera. A small aperture has a larger number. See a full technical description of aperture on Wikipedia: http://en.wikipedia.org/wiki/Aperture Also important is the f-number that explains what the aperture number means: http://en.wikipedia.org/wiki/F-number f-number = focal length / diameter of the entrance pupil So if we want to know the entrance pupil size of an 100mm f4 lens we calculate it like this: Diameter = 100 / 4 Giving us a 25mm front lens element. An 85mm f1.4 lens results in a 60.7mm front lens element (85 / 1.4 = 60.7143). Aperture size vs. depth of field. The most important statement I didn’t cover in the video is “the aperture determines how collimated the admitted rays are,” so a small aperture has very collimated rays of light getting throu...

After being at a local Japanese garden a few days ago, we went to a local park that has a large amount of graffiti. I have some additional photos on this site from the same place, but I thought I’d add some from the recent trip as things change frequently.  I used the FA* 85mm f1.4 and DA 14mm f2.8 lenses. The 85mm is frankly amazing at rendering pleasing backgrounds. Not much else to say except that Pentax needs to release a D-FA WR version of the 85mm lens with rounded aperture blades and such just like they did with the FA 100mm f2.8 macro lens. A D-FA 85mm f1.4 WR would be a prefect lens by most accounts. I’m just a back seat driver, so what do I know though? 🙂