[jjensson]

Thanks for the new test, photozone! I don't understand why nobody is talking about it, and don't know how the f8 sample images are focused, but why is it that the distance is sharp in the center of the landscape images and out of focus in all the other parts except the near foreground? Can anybody explain this phenomenon?



EDIT: Changed "infinity" to "distance", since it was unclear formulated.

[Brightcolours]

I have not looked at the images yet, but what you describe is called "field curvature". The in focus plane then is curved.

[dave9t5]

[quote name='jjensson' timestamp='1340822879' post='19204']

Thanks for the new test, photozone! I don't understand why nobody is talking about it, and don't know how the f8 sample images are focused, but why is it that infinity is sharp in the center of the landscape images and out of focus in all the other parts except the near foreground? Can anybody explain this phenomenon?

[/quote]



I don't see any f/8 sample images focussed at infinity. This is not surprising, since Markus is a notorious close-focuser. Nothing interesting happens at infinity anyways.

[PuxaVida]

Field curvature is likely to be seen in almost every fast WA lens at wide open. The point is whether the curved focus plane can be observed or masked depending on the f-stop value set. And IMHO, it's not a big deal for classic landscape usage because:



- usually f/8 onwards is used.

- focusing at infinity @ around f/11 shows everything in focus.



In which image sample you've observed field curvature?... Because the following sample for instance (shot @ f/7.1) does not show it at all:

[Studor13]

"Nothing interesting happens at infinity anyways."



Really? Not even the moon?

[mst]

Well, yes... but that's not a wide-angle shot <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/wink.gif' class='bbc_emoticon' alt='' />



-- Markus

[dave9t5]

Ha, ha, I was just making a bad joke. If an object is really at infinity then it's probably not visible. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/laugh.gif' class='bbc_emoticon' alt=':lol:' />

[Studor13]

[quote name='mst' timestamp='1340902288' post='19226']

Well, yes... but that's not a wide-angle shot <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/wink.gif' class='bbc_emoticon' alt='' />



-- Markus

[/quote]



If I didn't have a couple of cracked ribs I'd find some other moon shots (at 28mm fov). Yeah, long story, but am on the amends.



I'll even show you where I took the shot from. Just beautiful, you won't believe it. And I think that when you get here there will actually be a full-ish moon to work with.

[mst]

Cracked ribs? Ouch... all the best!



Full moon sounds good, that's honestly something I haven't ever photographed, yet... following dave's argument probably because I haven't found a lens yet with such a long MFD <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='' />



Btw: we'll be travelling with minimum photographic gear this year, which means the V1. I'll include one DSLR lens, though that we can maybe have some fun with on the D800 and the V1: the PC-E 85.



-- Markus

[dave9t5]

[quote name='Studor13' timestamp='1340908356' post='19229']

If I didn't have a couple of cracked ribs I'd find some other moon shots (at 28mm fov). Yeah, long story, but am on the amends.



I'll even show you where I took the shot from. Just beautiful, you won't believe it. And I think that when you get here there will actually be a full-ish moon to work with.

[/quote]



Hope it wasn't my joke that cracked you up...wakka wakka.