andrewmfilms
Member
I AM using ND filters, and I'm quite positive that's why this is happening, but why? It looks like it's blurred but not blurred. Anyone else have this?
http://i.imgur.com/sRep2no.jpg
http://i.imgur.com/sRep2no.jpg
GH4 Why does my depth of field blur look like this?
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jlpskydive
Active member
Small sensor and relatively small aperture compared to Full Frame. You will never get the Boka of a 5D on a GH anything.
stoneinapond
Veteran
Are you asking about bokeh as assumed by the subsequent response, or are you talking about the general sharpness of your image?
In other words, what do you perceive as actually "happening".
What ND filter did you use ?
What lens did you shoot with ?
What were your camera settings ?
I've only had wonky results like this when using an older variable-ND with lenses longer than 75mm. ( I got rid of the cheap variable-ND and my results were much better )
j1clark@ucsd.edu
Veteran
Uh? What's the problem with the images... what is 'blurred' and 'not blurred'... you have a wood plank that seem in sharp focus, you have 'burred' background... there's nothing out of the ordinary.
andrewmfilms
Member
I used a PROND16 with a lumix 12-35mm. I don't have any interesting camera settings, just CinelikeD. There's nothing WRONG with the shot, it just looks a little funky if you zoom up.
The shot wasn't supposed to be 'good'. I just put the camera on a tripod and recorded.
Here's a 1/2 frame split image focused first on a tree seed pod and then the background with the same pod in the foreground, frame grabs from footage from a 1/3" sensor. You clearly don't need a full frame sensor to get shallow dof, you can get it with an iphone. You do need focus as critical as possible. Critical focus (essentially) is related to lens length (the longer the shallower) and aperture. So to get critical focus for any given camera you typically use the longest lens and widest aperture possible. The purpose of the ND filter is to let you use a wide aperture. Have a look at some on-line DOF calculators or tables to get an idea.
(PS - this is photography 101, I guess that's partly what these forums are for, but if I've missed the point completely, please forgive me)
(PS - this is photography 101, I guess that's partly what these forums are for, but if I've missed the point completely, please forgive me)
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GrahamH
Well-known member
Your focus is on the wooden rail or thereabouts. The bokeh of the out-of-focus trees doesn't look odd to me .... but without knowing which end of the 12-35mm you were zoomed to, or what f-stop you were at (f2.8?), it's hard to say much of anything.
(The ND filter obviously IS producing what you see, in that it's allowing you to use a 4-stop wider aperture than you might have otherwise.)
Edit: There are some bokeh examples from the Lumix posted here: http://m43photo.blogspot.com/2013/01/lumix-x-12-35mm-f28-review.html The 'sharp/unsharp' effect you mention shows up there - so I'd say it's a characteristic of the lens.
(The ND filter obviously IS producing what you see, in that it's allowing you to use a 4-stop wider aperture than you might have otherwise.)
Edit: There are some bokeh examples from the Lumix posted here: http://m43photo.blogspot.com/2013/01/lumix-x-12-35mm-f28-review.html The 'sharp/unsharp' effect you mention shows up there - so I'd say it's a characteristic of the lens.
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