Γιαρίμης Ηλίας
Supreme Member
Re: Nέοι φακοί από Sigma
Εμφανίστηκαν τα πρώτα τεστ για τον 20/1,4 αρτ .. με πολύ καλά αποτελέσματα οσον αφορά κυρίως την οξύτητα .. δυστυχώς για τους αστροφωτογράφους η επίδοση σε comma δεν είναι στα ίδια επίπεδα ..
http://slrgear.com/reviews/showproduct.php/product/1832/cat/30
http://www.lenstip.com/index.php?test=obiektywu&test_ob=457
Εμφανίστηκαν τα πρώτα τεστ για τον 20/1,4 αρτ .. με πολύ καλά αποτελέσματα οσον αφορά κυρίως την οξύτητα .. δυστυχώς για τους αστροφωτογράφους η επίδοση σε comma δεν είναι στα ίδια επίπεδα ..
http://slrgear.com/reviews/showproduct.php/product/1832/cat/30
Sigma has done it again! At first, the sheer heft and size is a little shocking, especially considering it's a prime lens. However, this shouldn't come as a surprise given Sigma's past Global Vision lenses. Theses lenses haven't focused on being the smallest, or lightest, but rather the best optically. And the new 20mm ƒ/1.4 Art delivers. Images are sharp - very sharp. The lens is also very well corrected for CA and distortion, though vignetting is rather apparent, especially wide-open. The weight and front-heavy design makes it a little bit of a chore as a walk-around lens, but not overly so. All in all, this as yet unrivaled lens is the widest and brightest full-frame ultra-wide lens available, and should certainly make your short list if you're in need of a superior ultra-wide landscape or astrophotography lens.
http://www.lenstip.com/index.php?test=obiektywu&test_ob=457
Pros:
unique parameters,
solid and stylish casing,
brilliant image quality in the frame centre,
excellent resolution on the edge of the APS-C/DX,
acceptable image quality on the edge of full frame,
slight lateral chromatic aberration,
sensible correction of spherical aberration,
lack of serious distortion problems,
slight vignetting on the APS-C/DX sensor,
silent and quick autofocus,
excellent parameters/price and performance/price index.
Cons:
noticeable coma,
very high vignetting on full frame,
work against bright light could have been better.
I admit that the tests of fixed focal length Sigma Art series lenses are becoming a bit boring. Every time you get a mechanically solid instrument with outstanding optical properties which, additionally, is sold for a sensible amount of money. When it comes to the model, tested here, Sigma went even one step further, offering original parameters which are hard to find in the line-up of other optical producers. I think there is nothing left to say…


