50 1.8 II Focus Problems?

[TucsonTRD]

I was trying to focus on the indent of the paragraph beginning with "While travelling..."





Front Focus:


[img]/cfs-file.ashx/__key/CommunityServer.Components.UserFiles/00.00.00.38.96/Front-Focus.jpg[/img]





Back Focus:


[img]/cfs-file.ashx/__key/CommunityServer.Components.UserFiles/00.00.00.38.96/Back-Focus.jpg[/img]





Good Focus:


[img]/cfs-file.ashx/__key/CommunityServer.Components.UserFiles/00.00.00.38.96/Good-Focus.jpg[/img]

[iND]

I stil think you are trying to focus too close for this lens (minimum focal distance of 1.5feet) especially for a 100 dollar lens.


I rarely ask any of my lenses to start autofocus from infinity.


You got any shots from a bit longer distance. Or maybe a 5.6 or 11 with the same experiment.





The dof for you is .07 x 12 inches (maybe this is too much for this lens)


You might try it at TEN FEET.

[Sheiky]

I did sort of the same test with my Sigma 50mm 1.4 and I also did it at about 3 feet so that shouldn't be the problem.


You can download a test chart which makes it more accurate and reliable. They are free for download and available in multiple types. Just use google. Often these charts come with a good manual, so you'll figure it out.


I think you're perhaps having trouble with the extra sensitive AF point around the centre in this occasion. I'm not sure, but it might be your problem. There's too much around the centre to focus on.


Try your test again with a proper focus chart and see what it does.


Hope you'll be more lucky then,


Jan