zoom into a wide? at DVinfo.net

Christopher Witz · October 24th, 2006, 07:06 AM

Just a thought......can someone do me a favor? can you put a wide angle adaptor ( like a .5 ) onto your camera ( without dof adaptor ) and zoom into it and see if the dof is less than the same focal length as without the .5 on?

imagine if it was?..... put a .5 ( or any wide add on lens ) on, zoom in, and whalla! shallow depth of field!

If not.... my bad. ( had a dream last night that it did work... and all the dof adaptor makers ganged up on me and flogged me with a giant spagetti noodle )

ciao!

Toenis Liivamaegi · October 24th, 2006, 11:23 AM

Once I had that same dream...
... but no, it wouldn`t work.

DOF for any given focal lenght and aperture will be the same and only depends on the imaging sensor size be it 1/4", 1/3", 2/3" etc the bigger the shallower the DOF just as in digital photography where compact cameras donn`t have depth of field.

See here http://www.mediachance.com/dvdlab/dof/index.htm

T

Frank Hool · October 24th, 2006, 12:06 PM

also have a look on this:
http://en.wikipedia.org/wiki/Circle_of_confusion

virtually such adapters work like image plane converters.

October 24th, 2006, 07:06 AM	#1
Christopher Witz Major Player Join Date: Feb 2006 Location: Louisville, KY Posts: 591	zoom into a wide? Just a thought......can someone do me a favor? can you put a wide angle adaptor ( like a .5 ) onto your camera ( without dof adaptor ) and zoom into it and see if the dof is less than the same focal length as without the .5 on? imagine if it was?..... put a .5 ( or any wide add on lens ) on, zoom in, and whalla! shallow depth of field! If not.... my bad. ( had a dream last night that it did work... and all the dof adaptor makers ganged up on me and flogged me with a giant spagetti noodle ) ciao!

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October 24th, 2006, 11:23 AM	#2
Toenis Liivamaegi Major Player Join Date: Nov 2005 Location: Tartu, Estonia Posts: 579	Once I had that same dream... ... but no, it wouldn`t work. DOF for any given focal lenght and aperture will be the same and only depends on the imaging sensor size be it 1/4", 1/3", 2/3" etc the bigger the shallower the DOF just as in digital photography where compact cameras donn`t have depth of field. See here http://www.mediachance.com/dvdlab/dof/index.htm T

October 24th, 2006, 12:06 PM	#3
Frank Hool Major Player Join Date: Apr 2006 Location: Barca Spain Posts: 384	also have a look on this: http://en.wikipedia.org/wiki/Circle_of_confusion virtually such adapters work like image plane converters.