| Author | Thread |
|
|
04/07/2006 04:04:17 PM · #1 |
Question, and this is just theoretical lens chat here...
But from what I can tell, the higher the macro the shallower the depth of field. How many shots have we seen that are way zoomed up on a small bug but the depth of the head is enough to be blurred out of focus due to the shallow DOF.
I am curious, is there any way to "expand" the DOF? Theoretically speaking. (Lens design as opposed to an actual lens.) Would widening a lens make any difference? As I understand it, a lot has to do with "light" and the fact that at macro narrow aperatures do not let in enough light to illuminate the subject and the DOF becomes extremely shallow.
What about a lens akin to Canon's 200mm f/1.8 It looks like an ice cream cone...
But could you do something similar and have a specialty macro lens with say a 90mm or 120mm front element?
Just curious....
- Saj
|
|
|
|
04/14/2006 09:31:57 PM · #2 |
Increasing the DOF usually means decreasing the size of the aperture. In extreme macro situations this may even have less effect.
I too would like to find out how to change the DOF.
I noticed that when I was shooting this series, I got more DOF when I brought the subject closer to the lens. In this case, it made the subject look smaller and farther away because of reversed lenses.
A recent shot with a similar DOF is the red ribbon for Textures. His aperture was 25.
This suggests to me that stopping down has little effect. I was unable to stop my reversed lens down because there is no manual aperture control. For this reason, I have started casually looking around for a Medium Format 2nd hand 50mm lens that has an aperture control.
I am going to guess though that you will need a pretty powerful telephoto lens to look through the smaller hole that reducing your forward telephoto will cause you.
I'm still toying with my finances to see which lenses I will get and when, but I will do my best to keep the forums updated if I do similar experiments with the Tamron 28-75 f/2.8 reversed. Still no aperture control though. |
|
Home -
Challenges -
Community -
League -
Photos -
Cameras -
Lenses -
Learn -
Help -
Terms of Use -
Privacy -
Top ^
DPChallenge, and website content and design, Copyright © 2001-2025 Challenging Technologies, LLC.
All digital photo copyrights belong to the photographers and may not be used without permission.
Current Server Time: 09/24/2025 04:19:03 AM EDT.
