Landscape photographers often deal with the dilemma of choosing between different types and brands of neutral density and graduated neutral density filters for use in high-contrast situations such as sunrise and sunset, where their cameras might not have enough dynamic range to be able to capture the entire scene. While we are not going to go over each and every brand to see which one performs better, we do want to show the difference in sharpness between glass and resin filters. For this particular test, we used three 0.6 (2 stop) filters from three different manufacturers – NiSi (glass filter), Lee (resin) and HiTech (resin). The latter two are probably the two brands that are used the most among photographers in the field.
A decentered lens contains one or more optical lens elements that are either moved or tilted from the principal axis of the lens. Such shifting or tilting of lens elements can potentially lead to blurring / softness of parts of the image due to divergence of light rays. While very slight decentering of optical elements can be observed in many lenses, especially on superzooms, severe decentering and tilting can render the whole image blurry, with the lens unable to achieve good sharpness across the frame.
When my article on field curvature was published a while ago, where I talked about how one could do a quick analysis of lens MTF data and determine if it exhibits any field curvature, some of our readers expressed interest in understanding how to read MTF charts. Since we talk quite a bit about lens performance and MTF data here at Photography Life, I decided to write a detailed article on the subject and do my best to thoroughly explain everything related to MTF curves, charts and all the verbiage that comes with them.
A fellow photographer recently asked me how much image degradation one would see with each Nikon teleconverter. As a nature photographer, I have been wondering myself about this for a while, but never had a chance to actually quantify what the image degradation figures would look like when using the TC-14E II, TC-17E II and the TC-20E III with Nikon lenses. I have been relying on field use and my vision so far and here is what I have thought about each teleconverter.
Michael Tapes Design, maker of the highly acclaimed LensAlign Focus calibration system, has announced FocusTune, The Auto-Focus Software Solution for correcting DSLR body/lens mismatch errors and restoring maximum sharpness potential.
I got my hands on a brand new Nikon 400mm f/2.8G VR that I have been testing for the last week or so. This weekend I am heading out to Yellowstone to shoot bears, wolves and whatever else I might encounter. This should give me a pretty good idea about how the 400mm f/2.8G VR performs in various environments with and without teleconverters. Here is the Nikkor beast: