What really makes big sensors produce more appealing images? *Serious*

Started Mar 13, 2014 | Discussions thread
knickerhawk Veteran Member • Posts: 5,112
Can we return to the main issue here please?

Dennis wrote:

Just another Canon shooter wrote:

knickerhawk wrote:

  1. DOF. This shot was taken with the excellent Canon 135mm f/2 L at f/2.5. "Ahah!" You say. "It's the shallow depth of field that makes all the difference. You can't do that with m4/3..." However, if you assume she's approximately 8 feet from the subjects, then the DOFMaster DOF calculator shows a DOF of about .15 feet. Indeed, that's shallow, but what if we increased the f-stop to f/5.6? Surely, that creates WAY too much DOF, right? Well, in fact the calculator shows a DOF of .34 feet. Hmmm. Not much difference after all and certainly not a difference that would have impacted this image.

You are confusing DOF with background blur. DOF is not really well visible on web sized images anyway. What creates that look and grabs the attention is the background blur. If you stop from f/2.5 to f/5.6, the (distant) background would be blurred much more (more than twice as much). This would create a distinctively different look.

Exactly. dofmaster tells you how much is acceptably in focus based on CoC assumptions. It doesn't tell you how blurred the OOF portions are.

This shot would have required a 70/1.2 to get the same effect. Then throw in the PPing.

The Oly 75mm at f/1.8 would have rendered the background in a very similar way, and of course adding an extra dollop of blur in PS on top of the additional PS blur she used would be no big deal at all.  You and Just another Canon have scored your technical point about the difference in background OOF between f/2.5 and f/5.6.  Now time to move on and seriously address the real issue of whether the "magic" of this image is uniquely due to it being shot FF.

Post (hide subjects) Posted by
(unknown member)
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow