could someone explain something to me ?

[jennifer8]

Hi it's jennifer again, with more questions !!!

I was doing an exercise where i was shooting a ruler looking down its length and took several shots only changing the aperture to see what happened to the depth of field and this worked well with my tamron lens 70-300mm on its macro setting but when i did the same exercise with my ef 18-55mm kit lens the aperture changes made absolutely no difference to the DOF

would somebody be kind enough to explain to me why ? i've been doing an online course and studying really hard but i seem to be having probkems putting the theory into practise.

Thank you
jen x

[RichardTaylor]

DOF also depends on shooting distance, focal length, as well as aperture.

If you were shooting at around 18mm the DOF is considerable - like ~2 feet even when shooting at F5.6 at a shooting distance of 3 feet. At 55mm the DOF would be around 2"


This DOF calculator may help.

Online Depth of Field Calculator

[jennifer8]

Originally Posted by RichardTaylor

DOF also depends on shooting distance, focal length, as well as aperture.

If you were shooting at around 18mm the DOF is considerable - like ~2 feet even when shooting at F5.6 at a shooting distance of 3 feet. At 55mm the DOF would be around 2"


This DOF calculator may help.

Online Depth of Field Calculator

thank you richard , the DOF calculator is very helpful !

[Jim Bryant]

Set up some objects in a straight line or find a fence line and start out shooting the first one at various f-stops and move onto the next and do the same thing and so forth. In Japan I used beer bottles. This is a great exercise in learning about DOF.

[jennifer8]

Originally Posted by Jim Bryant

Set up some objects in a straight line or find a fence line and start out shooting the first one at various f-stops and move onto the next and do the same thing and so forth. In Japan I used beer bottles. This is a great exercise in learning about DOF.

Thanks jim, i'm going to try that now !

[CheaperKings]

I got some beer bottles if ya need'em.

[dcclark]

It might help if you focus on the first one, set the camera down, and turn it to manual focus -- then take all photos with the camera in that position. That will avoid small errors caused by changing the focal point.

[kirbinster]

This is a much less boring exercise if after photographic each bottle you pause, open it, and then drink the beer If you do enough bottles you will find the is no depth of field at all - everything becomes blurry.

[douglas]

Originally Posted by kirbinster

This is a much less boring exercise if after photographic each bottle you pause, open it, and then drink the beer If you do enough bottles you will find the is no depth of field at all - everything becomes blurry.

"Well shed" Hic

[jennifer8]

Originally Posted by kirbinster

This is a much less boring exercise if after photographic each bottle you pause, open it, and then drink the beer If you do enough bottles you will find the is no depth of field at all - everything becomes blurry.

love that exercise the most !!! don't think i will learn much but how fun !!!