Digitalis32

Yes, Lateral colour aberrations do exist with this lens*. In my usage of this lens I have experienced it, but not quite to this degree but then again: I stop my lenses down for distant subjects. ...

Chromatic aberrations are remarkably well controlled with the DFA21mm f/2.4 Limited. Even at f/2.4 I had to do nothing more than use the default levels of software correction LR provides. One thing ...

Pentax K1 - DFA21mm f/2.4 Pentax K1 - DFA21mm f/2.4 Pentax K1 - DFA21mm f/2.4 Pentax K1 - DFA21mm f/2.4 Pentax K1 - DFA21mm f/2.4 Pentax K1 - DFA21mm f/2.4 Pentax KP - DFA21mm f/2.4

Shoot at f/16 that way every lens is equally bad.

Pentax remaking the FA limited lenses with the HD coating and 9 bladed circular apertures - two features that no one ever asked for . There is a mountain of excellent Sigma lenses that should never ...

Yes, the DFA21 is indeed expensive, however I will point out that no lens will truly last forever if it is not maintained and looked after and in this respect all lenses are the same*. I will also ...

This is exactly why I posted these images, hopefully to promote some debate on whether this lens is really worth the price tag, even though when alternatives such as the Zeiss Distagon T* 21mm ...

Linear distortion is present, however it can be hidden with careful framing though for photographs where prominent straight lines go near the edge of the frame some distortion will be apparent: in ...

For those who have a keen interest in the lens and want to see for themselves what the lens is capable of with only basic editing. Pentax K-1 DFA21 @f/16 ISO 1600- shadows/highlights pushed/pulled ...

MIRI should be able to see through much of the dust and ultrabright radio sources that are in the way, at the very least it should be able to show us the larger structures bound by the black hole's...

ahh but the problem with Rangefinders was the limitations in focal lengths imposed by the manufacturer through built in framelines, and an inherent focus inaccuracy of the RF system: close ...