Originally posted by stevebrot Given the length and girth and depth of the hood, I would have guessed a fast 85
Perhaps the hoods are interchangeable between the FA*50mm f/1.4 and the FA*85mm f/1.4, pentax has a history of doing that.
Originally posted by grahame Sigma copy in fact: huge, heavy. not pentax any more
And this assertion is based upon what evidence?* Extraordinary claims require extraordinary proof, I know I am not alone here: I want citations.
* If you are going by the similarity of the minimum focus distance between the Sigma 50mm f/1.4 ART and the Pentax D-FA 50mm f/1.4 which I'll admit is
unique among fast standard Pentax 50mm primes [ which have been typically 0.45m or 1.5ft] - doesn't make it a FACT it is a Sigma re-badge. Unlike the infinity focus point which is governed by the lens mount flange distance. Minimum focus point in regards to optical design is largely arbitrary [ and also subject to the reduction of image quality that is deemed "acceptable" by the optical engineers] you could make a 50mm f/1.4 lens focus to 1:1 if you really wanted to. However, the intensity of illumination at the focal plane will be diminished greatly at such a focus distance due to the cos
4 law so a T=1.4 lens at infinity would behave more like a t=4.8 lens at 1:1. With a loss of approximately 1/8 a stop as you move outwards from the center portion of the image circle... which would make the amount of vignetting slightly worse than the existing DA*55mm f/1.4 @ infinity on the K-1.