Tag Archives: af

Pentax Lenses: Auto-Focus (AF) Sound Test Roundup

I noticed people in general are interested in how each lens sounds (myself included), so I thought it would be helpful to put together a video demonstrating a set of lenses and how they sound when doing auto-focus (AF). This set is Pentax as it is the brand I use currently. The other benefits of this video is that you can get a feel for how the lens handles and … Continue reading

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Kenko Pz-AF 1.5x Teleplus SHQ with SDM Auto-focus

Recently I had a question about the Kenko teleconverter about if it functions with SDM lenses and if the teleconverter hurts image quality. I thought this was a good request and warranted an article or two on the blog. If you are not familiar with teleconverters (TC for short), they attach between the camera and lens allowing you more reach, or rather more magnification. Some people feel they are not … Continue reading

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Fixing the K10D Back-focusing AF Issue

Disclaimer: There is no warranty or assuredness that the text provided is accurate, so you must try at our own personal risk. Know that you could screw your camera up if you are not careful and the risk is only yours to take. If you don’t want to take the risk, send the camera in to Pentax for servicing. It’s that simple! Now with the Myth Busters-esque disclaimer out of … Continue reading

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Camera Factory Variation (Auto-Focus alignment)

I was planning on writing an article about my three wide angle lenses (14mm f2.8, 10-17mm fisheye, and Zenitar 16mm fisheye). I started taking a few sample photos with each and noticed something strange. The images at wide aperture with the 14mm f2.8 looked really poor. Initially I was thinking that user error was involved, so I went through various processes about… 3 or 4 times with the same result. … Continue reading

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