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Latest Review Posted SMC Pentax 300mm F4
This is my longest lens. I primarily use it for birding. I routinely mount it to the Sigma APO 2X AF Teleconverter and get good results. It takes a lot of practice and some luck to get birds in flight due to the shallow DOF. It is built like a tank. I dropped it once onto a carpeted floor from a height of five feet. One of the lens mount's flanges was bent, but I replaced that myself using a spare mount I had. The only other damage was to the aperture mechanism, and that was fixed by a minor readjustment which was done by a repair shop. Nothing else was broken. The tech said one of the newer mostly plastic lenses would have had broken lens mounts from such a fall. It is a sharp lens, and when I get the focus right, it produces excellent images. Below is a hummingbird photo I took at my backyard feeder. The bird was about 10 feet away and I used a 24mm extension tube to get the lens to focus at this closer then normal distance. 300mm, F8, fill flash, 500 ISO, K5 on X setting. Some noise reduction and exposure adjustment was done in Photoshop Elements. This is a cropped image that is as close to 100% in size as I can approximate. I took one of the previous reviewers advice and purchased a Canon aftermarket Tripod Ring on eBay. On the ring it says A(W) Micro 100 F2.8. It fits the 300 4 perfectly and I have kept it on the lens ever since. It mounts securely to the lens between the aperture ring and the focus ring and it balances the lens and my K5 perfectly. I no longer have...



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