![]() On the bare lens at ƒ/8, CA was almost double.Īt the middle focal length we tested (193 + 1.4x / 289mm), chromatic aberration is much lower at the wider apertures. At ƒ/8, average CA is less than 150th of a percent of frame height, which is very low. As you stop down, the chromatic aberration is quite dramatically reduced. At ƒ/5.6 with the teleconverter, the average CA is actually lower on this lens than without the TC. Past that aperture however, diffraction softness becomes an issue.Īt 168mm (120mm + 1.4x), the chromatic aberration at ƒ/4 is pretty minor. Even at ƒ/16, the results are acceptable. At ƒ/5.6 – ƒ/8 the images were quite sharp, and more so in the center. As you stop down, the Sigma 120-300 lens + Sigma teleconverter combo produces some sharp images. Wide open at f/4, this teleconverter can produce shar image, notably in the center of the frame. When you get a good copy, this telelconverter produces decently sharp results. This fourth copy was by far the best one we tested, and it's the results we included in this final review. #Sigma lens serial number lookup serial numbers#The first three has serial numbers that were all very close to each other. #Sigma lens serial number lookup serial number#We were eventually given a fourth copy of this teleconverter, which had a higher serial number than first three we tested. Excluding the slight loss in sharpness that comes with any teleconverter, we saw no right side softness with the Canon extender. To rule out any lens issues, we also tested the 120-300mm lens with a Canon 1.4X Extender II, and the results were much better. The third copy behaved similarly, although it was the best of the three. The second copy showed similar results to the first one. We requested a second and then a third copy of the teleconverter. Other than the expected reduced sharpness, we saw significant softness on the right side of the images wide open when using a full-frame camera (notice the difference here at 300mm ƒ/2.8 vs. With the teleconverter attached, however, we ran into a strange issue with this lens accessory. Without the extender, the new Sigma 120-300mm lens produced excellent results ( check out our review). Sigma shipped the APO TELE CONVERTER 1.4x EX DG along with the Canon-mount version of their new 120-300mm ƒ/2.8 DG OS HSM "S" telephoto zoom lens, and we used that lens to test this converter. The Sigma APO TELE CONVERTER 1.4x EX DG ships with front and rear caps as well as a small carrying case and is compatible with both full-frame and sub-frame cameras. ![]() Overall, functionally similar to these teleconverters, the Sigma 1.4x extender is significantly less expensive at around $225 compared to the $450 and $499 price tags of the Canon and Nikon extenders, respectively. For Canon and Nikon, it competes directly against these manufacturers' own 1.4x teleconverters: the Canon 1.4X Extender EF III and Nikon 1.4X AF-S TC-14E II. The top answer covers the decoding of the letters very well.The Sigma APO TELE CONVERTER 1.4x EX DG comes in Canon, Nikon and of course Sigma mounts. ![]() (also branded as: Pro-Optic Rokinon Bower).Descriptions by Lens FeaturesIf you know what feature you're looking for in a lens (cropped-frame designation ultrasonic motor, low-dispersion elements, image stabilization, etc.), and want to know what each of the brands call that feature, the following answers are organized by lens feature. ![]() Such lenses tend to follow the most stringent quality guidelines, and often come with a price premium.Off-Brand LensesMost off-brand lens manufacturers make lenses that fit many types of bodies, including Canon, Nikon, etc. ![]() Descriptions by Lens Make Brand LensesAll major camera manufacturers offer their own line of lenses. The historical answer has been broken up into individual answers per lens brand, with links to each of the lens brand answers below. When looking at a lens name, there are a lot acronyms describing its features (often specific to the manufacturer).Examples, Nikon:Nikon AF-S DX 16-85mm VR f/3.5-5.6G IF-EDNikon AF-I 600mm f/4D IF-EDNikon AF-S VR Micro-NIKKOR 105mm f/2.8G IF-EDExamples, Canon:Canon EF 85mm f1.2L USM Mark IICanon 70-300mm f/4.5-f/5.6 DO ISExamples, Sigma:Sigma 150mm F2.8 EX APO DG HSM MacroSigma 70-200mm F2.8 EX DG OS HSMSigma 50-150mm F2.8 EX DC APO HSM IIHow do I decipher these lens codes from different manufacturers? Note: Because of the community-wiki nature of this question, this accepted answer became really long, and difficult to edit and keep current as lens designations evolved. ![]()
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