01-16-2012, 04:25 PM
(This post was last modified: 01-16-2012, 04:30 PM by Brightcolours.)
[quote name='nandadevieast' timestamp='1326730540' post='14910']
Fly in the ointment: <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/unsure.gif' class='bbc_emoticon' alt=':unsure:' />
Below is a quote by Tim Kimzey "fstop" while reviewing 60 macro on http://www.amazon.com/review/R3IY2SSCCFY...=&linkCode=
"I must express why I am a little disappointed in that regard. From tests I have done so far, f/2 does not seem to come into play until around 14 feet to infinity. At focusing distances closer than 14 feet, the lens switches to f/2.2. It switches from 2.2 to 2.8 between 12-ish feet and a foot (that's not bad really, so you still have 2.8 all the way up to a foot in front of the lens). All true macros will do this to my knowledge, the physical parameters of focusing so close loses light. I was expecting this. But I absolutely think/wish the lens would stay a true f/2 in the portrait-shooting distances (3-8 feet lets say). Of course, its still a good deal faster than 2.8. But using the lens in studio settings or in manual modes or with manual flash settings, the aperture / exposure shifts could be annoying. And you are not getting the low-light usefulness of f/2 for any portrait-distance use."
<img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/huh.gif' class='bbc_emoticon' alt='
' /> really technical stuff. But all i am interested in knowing is if this lens changes the DOF characteristics also while changing the F stop as stated above. If the background blur doesn't change from a portrait perspective, i'm fine.
Will someone know about this?
[/quote]
As he states, the closer you focus, you just will lose light. The focal length-aperture size ratio changes. I believe this is referred to as the bellows effect? With the 90mm, You will see it less in portraiture usage, as your distance to the subject will be less. So, in closer to the subject shooting, so tighter framing, you might see the 90mm to get a slight advantage back ground blur wise.
On the plus side, this 60mm from Tamron has super smooth bokeh though, which is a big plus for portrait work.
http://www.flickr.com/photos/45968460@N03/5248696703
http://www.flickr.com/photos/58016831@N00/4535589140
http://www.flickr.com/photos/45968460@N03/5287966434
Fly in the ointment: <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/unsure.gif' class='bbc_emoticon' alt=':unsure:' />
Below is a quote by Tim Kimzey "fstop" while reviewing 60 macro on http://www.amazon.com/review/R3IY2SSCCFY...=&linkCode=
"I must express why I am a little disappointed in that regard. From tests I have done so far, f/2 does not seem to come into play until around 14 feet to infinity. At focusing distances closer than 14 feet, the lens switches to f/2.2. It switches from 2.2 to 2.8 between 12-ish feet and a foot (that's not bad really, so you still have 2.8 all the way up to a foot in front of the lens). All true macros will do this to my knowledge, the physical parameters of focusing so close loses light. I was expecting this. But I absolutely think/wish the lens would stay a true f/2 in the portrait-shooting distances (3-8 feet lets say). Of course, its still a good deal faster than 2.8. But using the lens in studio settings or in manual modes or with manual flash settings, the aperture / exposure shifts could be annoying. And you are not getting the low-light usefulness of f/2 for any portrait-distance use."
<img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/huh.gif' class='bbc_emoticon' alt='
' /> really technical stuff. But all i am interested in knowing is if this lens changes the DOF characteristics also while changing the F stop as stated above. If the background blur doesn't change from a portrait perspective, i'm fine.Will someone know about this?
[/quote]
As he states, the closer you focus, you just will lose light. The focal length-aperture size ratio changes. I believe this is referred to as the bellows effect? With the 90mm, You will see it less in portraiture usage, as your distance to the subject will be less. So, in closer to the subject shooting, so tighter framing, you might see the 90mm to get a slight advantage back ground blur wise.
On the plus side, this 60mm from Tamron has super smooth bokeh though, which is a big plus for portrait work.
http://www.flickr.com/photos/45968460@N03/5248696703
http://www.flickr.com/photos/58016831@N00/4535589140
http://www.flickr.com/photos/45968460@N03/5287966434