Go Back   Steve's Digicams Forums > Digicam Help > What Camera Should I Buy?

Reply
 
Thread Tools Search this Thread
Old Aug 3, 2007, 1:14 PM   #1
Member
 
Join Date: Jul 2006
Posts: 71
Default

Is there such a thing? I need something that has a broad ability to focus. It seems that when I had a Nikon D50 and a couple year old AF Nikon Macro lens the bigest problem was getting close to say mushrooms and getting the whole mushroom into focus. It would either focus on the gills or the cap of the mushroom. It was very frustrating. Would a larger F stop (think that is the terminology) help with this?
Attached Images
 
chupicabra30 is offline   Reply With Quote
Sponsored Links
Old Aug 3, 2007, 1:15 PM   #2
Member
 
Join Date: Jul 2006
Posts: 71
Default

frog
Attached Images
 
chupicabra30 is offline   Reply With Quote
Old Aug 3, 2007, 1:16 PM   #3
Member
 
Join Date: Jul 2006
Posts: 71
Default

Frog2
Attached Images
 
chupicabra30 is offline   Reply With Quote
Old Aug 3, 2007, 1:16 PM   #4
Member
 
Join Date: Jul 2006
Posts: 71
Default

Rusulla 1
Attached Images
 
chupicabra30 is offline   Reply With Quote
Old Aug 3, 2007, 1:16 PM   #5
Member
 
Join Date: Jul 2006
Posts: 71
Default

Rusulla 2
Attached Images
 
chupicabra30 is offline   Reply With Quote
Old Aug 3, 2007, 1:17 PM   #6
Member
 
Join Date: Jul 2006
Posts: 71
Default

Stinkhorn1
Attached Images
 
chupicabra30 is offline   Reply With Quote
Old Aug 3, 2007, 1:29 PM   #7
Moderator
 
Join Date: Aug 2004
Posts: 8,529
Default

Yes, you want to use a larger f-stop to get the whole thing in focus . This is why a good tripod is a great tool.
JohnG is offline   Reply With Quote
Old Aug 3, 2007, 1:58 PM   #8
Senior Member
 
Join Date: Jul 2003
Posts: 3,396
Default

Yes,
you can user dofmaster to work out what your depth of field is for your lens/camera combination. http://dofmaster.com/dofjs.html

Basically at the distances used for macro the dof is measured in fractions of an inch.
For a camera with an APS/c sized sensor :
60mm macro lens @ f/16 focused at 8.34 inches (1:1) has a DOF of 0.23 inches.
105mm macro lens @ f/16 focused at 12 inches(1:1) has a DOF of 0.14 inches. @ f/22 it is 0.2 inches.

I have a 150mm macro at 16 inches (1:1) @ f/16 my DOF is 0.11 inches @ f/22 it is 0.16 inches.

When close focusing at 1:1 only a tiny portion is in sharp focus.

Trouble is however diffraction effects cause image sharpness to start to drop off after about f/13 on most dslr's. A function of the Circles of Confusion and the pixed density.
PeterP is offline   Reply With Quote
Old Aug 3, 2007, 2:05 PM   #9
Member
 
Join Date: Jul 2006
Posts: 71
Default

PeterP wrote:
Quote:
Yes,
you can user dofmaster to work out what your depth of field is for your lens/camera combination. http://dofmaster.com/dofjs.html

Basically at the distances used for macro the dof is measured in fractions of an inch.
A Nikon D50 with a
60mm macro lens @ f/16 focused at 8.34 inches (1:1) has a DOF of 0.23 inches.
105mm macro lens @ f/16 focused at 12 inches(1:1) has a DOF of 0.14 inches. @ f/22 it is 0.2 inches s

When close focusing at 1:1 only a tiny portion is in sharp focus.
Thanks for that! Im sure that will help when I do get a lens. Right now I want to get a macro lens. Can you recommend one?
chupicabra30 is offline   Reply With Quote
Old Aug 3, 2007, 2:10 PM   #10
Senior Member
 
Join Date: Jul 2003
Posts: 3,396
Default

Yes, I've been quite happy with the Sigma 150 f/2.8 macro, and have heard good things about the Sigma 105mm f/2.8 macro.

They work very well and are much less expensive than the Canon or Tamron equivalents.
PeterP is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 3:22 AM.