However, given our experience with optical problems with three out of four different copies of this extender, it makes it quite difficult to recommend.
If you can find yourself a good copy, then you might do ok. Otherwise, we'd recommend you look at other brands of teleconverters. Check out the manufacturer page as well as this video demonstration produced by Sigma for more information. The VFA target should give you a good idea of sharpness in the center and corners, as well as some idea of the extent of barrel or pincushion distortion and chromatic aberration, while the Still Life subject may help in judging contrast and color.
We shoot both images using the default JPEG settings and manual white balance of our test bodies, so the images should be quite consistent from lens to lens. For the ''VFA'' target the viewfinder accuracy target from Imaging Resource , we also provide sample crops from the center and upper-left corner of each shot, so you can quickly get a sense of relative sharpness, without having to download and inspect the full-res images. To avoid space limitations with the layout of our review pages, indexes to the test shots launch in separate windows.
I use this TC with the Sigma mm f2. Even with the D the ensamble is sharp enough at full aperture "f4" , and a razor when stepped down. Almost no decay in the bokeh and absolutely no CA in any condition. But, but This Converter is mechanically incompatible virtually with every lens but Sigma.
This could be not an issue, since the compatible Sigma lenses have a particular design for mounting the TC, and the results are very high in average. But, again But both my D and D have an AF system that works well til f8! And also my old D2x and D worked well, covering the electric contact in order to "cheat" with the electronics and hide the TC to the body. Why the hell I cannot use the autofocus with my Sigma mm f4.
Pity, because the optical results are decent, but an MF lens of over mm is impractical, at least. On my it is as sharp as without the TC. I didn't notice any degradeing of speed or IQ.
The colors are still vibrant and the contrast is still good. Sigma scores again. Sigma 1. Lens Review Specifications Description. Still Life shot. Shop now and save time and money in buying products you will be happy with! Our team would love to hear from you on any topic. Please e-mail us on support bestviewsreviews. Popular Products.
New Year Deals. Air fryer. Touch Screen Laptops. Electric BackMassager. Colloidal Silver Mineral Supplements. Inkjet Printers. Roll over image to zoom in. Buy on Amazon. Picture quality. Customer support. Focal length. Value for money. Image stabilization. Title: Robert K Dwyer. Description: The Moon, Inspiration for life.
Title: Kim Ringeisen. Description: Tuscan Sun meets Tuscan Moon. As I was shooting in Tuscany this pat August, the moon was the largest I have ever seen it, setting up in a rolling tuscan hillside, I was able to capture this detailed and wonderful image with my Bigma!
Title: Old Lovers. Camera: Pentax Lens: 2. Description: Old Lovers. The focal length changes the angle of view in an image. The longer the focal length, the smaller the angle of view and the greater the magnification. Learn about the state of the art technology put into Sigma lenses to ensure high quality images. Get more reach with what you have. Check the compatibility of your lens with the teleconverter chart.
The MTF is just one criterion used to evaluate lens performance. Technical Support: 1. This website requires cookies to provide all of its features. For more information on what data is contained in the cookies, please see our Cookie Policy page.
0コメント