Is this true 1:1?
Jun 12, 2014 16:48:44 #
I have used my 50mm with some cheap non electronic extension tubes which provide an extension of 65mm.
Am I right in thinking I am at slightly higher magnification than 1:1
This image shows a 5mm straw with my camera being a Canon 7D so 22.3mm sensor.
The depth of field is crippling with this setup so would a dedicated macro lens like the 100mm F/2.8 L offer better or worse DOF?
Thanks for your help, Mark
Am I right in thinking I am at slightly higher magnification than 1:1
This image shows a 5mm straw with my camera being a Canon 7D so 22.3mm sensor.
The depth of field is crippling with this setup so would a dedicated macro lens like the 100mm F/2.8 L offer better or worse DOF?
Thanks for your help, Mark
Jun 12, 2014 16:50:45 #
This looks like 1:1 magnification, or very close.
DoF will always be a challenge in true macro-photography. Aperture is the main factor in determining DoF, with focal length next. A 100-mm macro lens is quite a bit easier to use than a standard 50-mm lens with extension tubes. Also, a true macro lens captures a flat field, whereas a standard lens, even with tubes, captures a curved field of view.
For now, practice with what you have. Ask questions. Look at results of other macro-photographers.
Exif info:
Camera Model: Canon EOS 7D
Image Date: 2014-06-12
Focal Length: 50mm
Exposure Time: 0.017 s (1/60-sec)
ISO equiv: 100
Exposure Bias: none
Metering Mode: Matrix
Exposure: aperture priority (semi-auto)
White Balance: Auto
Flash Fired: No
What was your aperture?
DoF will always be a challenge in true macro-photography. Aperture is the main factor in determining DoF, with focal length next. A 100-mm macro lens is quite a bit easier to use than a standard 50-mm lens with extension tubes. Also, a true macro lens captures a flat field, whereas a standard lens, even with tubes, captures a curved field of view.
For now, practice with what you have. Ask questions. Look at results of other macro-photographers.
Exif info:
Camera Model: Canon EOS 7D
Image Date: 2014-06-12
Focal Length: 50mm
Exposure Time: 0.017 s (1/60-sec)
ISO equiv: 100
Exposure Bias: none
Metering Mode: Matrix
Exposure: aperture priority (semi-auto)
White Balance: Auto
Flash Fired: No
What was your aperture?
Jun 12, 2014 17:10:24 #
Thank you for your help.
So my curved field of view will show some things slightly out of focus even though in reality they are the same distance from the lens?
Good weather forecast so more chances to get out and practise.
So my curved field of view will show some things slightly out of focus even though in reality they are the same distance from the lens?
Good weather forecast so more chances to get out and practise.
Jun 12, 2014 17:12:56 #
If you are interested in know your magnification at Minimum Focusing Distance, read more here:
FAQ: How to Document Field-of-View of a Macro Lens
http://www.uglyhedgehog.com/t-36370-1.html
Also, more general macro info:
Frequently Asked Questions & Answers Concerning Macro-Photography
http://www.uglyhedgehog.com/t-36372-1.html
FAQ: How to Document Field-of-View of a Macro Lens
http://www.uglyhedgehog.com/t-36370-1.html
Also, more general macro info:
Frequently Asked Questions & Answers Concerning Macro-Photography
http://www.uglyhedgehog.com/t-36372-1.html
Jun 12, 2014 17:14:07 #
Due to non electronic extension tubes it doesn't show aperture but I think I had it at F/8 or F/11 ( used the method of setting aperture then hold down dof preview button while taking lens off, maybe not recommended but only way with non electronic extensions)
Note to self : Must make notes next time
Note to self : Must make notes next time
Jun 12, 2014 17:31:54 #
Izza1967 wrote:
Actually, a curved FoV captures in focus, everything that is equidistant from lens, in a hemispheric arc. A flat FoV captures everything that is tangent to lens, along same plane. Normal prime & zoom lenses capture curved FoVs; true macro lenses capture flat FoVs.So my curved field of view will show some things slightly out of focus even though in reality they are the same distance from the lens?
Curved-field vs flat-field
Jun 12, 2014 17:36:24 #
Izza1967 wrote:
Bingo!Note to self : Must make notes next time
Or use Auto-Extension Tubes, which will allow communication between lens and camera, and record as Exif info.
Jun 12, 2014 17:39:33 #
My wording let me down there, your explanation is far easier to understand
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