[MossyRocks]

The FA 50 wide open is a dreamy lens at best. Very weak corners indeed.

All of the Pentax 50/1.4 lenses with the exception of the D FA* 50/1.4 seem to be that way and even the DFA*50/1.4 still struggles a lot with astro wide open. However the sample shot from above looks softer than it should be even for astro shooting and more like the focus was missed slightly.

[BenwayB]

Hello,

I'm sure I messed up focussing!

Same for the shots with the DFA 21.

I did not focus at all, but only set the lens to the unlimited mark :-)

I took further pictures already, without this mistake.
Maybe I manage to upload some of the tonight.

Concerning the FA 50... I have this lens in perfect condition since some weeks... and I think I will sell it again.

I don't like it in comparison to the FA 43 limited - that is slower, but better :-)

Best regards!

[MossyRocks]

I did not focus at all, but only set the lens to the unlimited mark :-)

The infinity mark is rarely where true infinity is. I have had to adjust almost all my lenses as most got really close but didn't make it. So now they all focus slightly beyond infinity.

Concerning the FA 50... I have this lens in perfect condition since some weeks... and I think I will sell it again.

I don't like it in comparison to the FA 43 limited - that is slower, but better :-)

Preference really does make a difference for keeping a lens or not. Not having the the 43ltd I have no idea how it does with astro shooting but in taking a wild guess I would think it may get to astro good at the same f/2.8 as the FA 50/1.4 but that is just a guess.