Focal Problems

[Big_B]

The below picture is pretty sharp in the middle but it all goes a bit wrong round the edges. Especially in the top right.

Is this normal and simply requires a bit of sharpening, or am I doing something wrong? I'm pretty new to this digital thing, so sorry if its a stupid question :oops:

Cheers!

http://homepage.ntlworld.com/sam.blackie/Public/DSC_0086.jpg

RAW (12-bit) Lossless
Image Size: Large (3008 x 2000)
Lens: 24-85mm F/3.5-4.5 G
Focal Length: 85mm
Exposure Mode: Aperture Priority
Metering Mode: Multi-Pattern
1/500 sec - F/4.5

[stopbath]

My guess is that the lens itself does not have a completely flat depth of field.

Try using a greater depth of field to compensate for it.

(A true MACRO lens, should have an exceptionally flat depth of field, but a lens that just focuses close may not specifically strive for such a flat depth of field as the cost of the lens will increase.)

[meow]

The light is different in that corner too. Much less contrast there, isn't it?

[meow]

Had to try. Sorry, but this is such a fun way of learning. :p

http://ababa.net/stuff/leaf.jpg

A little more contrast and local contrast in the corner. No sharpening.

[Scottes]

f/4.5 at 85mm won't have much depth of field this close. I'm surprised you got as much in focus as you did.

This looks very sharp for having no sharpness applied. Adding a touch of sharpening would make this look stunning. For a web size image, try Unsharp Mask at something in the range of Amount 100% to 150%, Radius 0.3 to 0.6, Threshold 0. Also add a bit of contrast as Meow did.

It is perfectly normal for RAW images to require some sharpening. If you had taken a JPG the camera would have sharpened a bit before it saved the JPG.

[Big_B]

Had to try. Sorry, but this is such a fun way of learning. :p


Please don't apologise... I have a 100 more that need looking at. If you want to learn you are more then welcome to edit those for me as well :wink: :D 8)



f/4.5 at 85mm won't have much depth of field this close. I'm surprised you got as much in focus as you did.


You should have seen the other 5 that I took of the same leaf :oops: :D

[meow]

Hah-hah! You should see mine. :lol:

I find the digital learning curve very steep, almost intimidating for a rusty film guy like me. I've found it's easier (for me) to see things in other people's pics (because I'm not biased or blind or insecure or...).

[Big_B]

You and me both :)