Go Back   Steve's Digicams Forums > Digital SLR and Interchangeable Lens Cameras > Canon Lenses

Thread Tools Search this Thread
Old Jul 8, 2002, 1:04 PM   #1
Junior Member
Join Date: Jun 2002
Posts: 28
Default Macro with EF 75-300 IS :-)


Saturday I bought a Soligor extension tube set of 12, 20, 36mm. It's nearly the same as the Kenko set ... metal mounts.

I was astonished about the results in combination with the EF 75-300 IS ...

... this one was taken with the complete extension of 68mm and the lens at 75mm, so the magnification is nearly 1:1. I took it handheld at 1/60 sec, f16, ISO200 and the Speedlite 420EX on a D30. Oh, and yes ... IS was switched on and the working distance was something about 100mm.

What do you think?

I also tested with the EF 28-135 IS ... magnifications up to 1.5:1 are possible with the complete tube set. But the optics are not that good ... CA can become a little problem depending on the scene.
Chris™ is offline   Reply With Quote
Sponsored Links
Old Jul 11, 2002, 10:29 PM   #2
Senior Member
Join Date: Jun 2002
Posts: 143

Its quite impressive. I have used the 500D macro lens on this lens but the DOF is very shallow. Looks like you get better DOF with the extension tube.
sasc is offline   Reply With Quote
Old Jul 13, 2002, 4:39 AM   #3
Junior Member
Join Date: Jun 2002
Posts: 28

Hi S.,

yes the DOF is very nice, but it might be a matter of the aperture ... I read an german article about the CRITICAL APERTURE for macro ... there have been two formulas, one for extension tubes and one for close-up lenses.

I was astonished, that it is important to use the critical aperture, which means in short, that if you use a smaller one, the image sharpness will become worse.

I recommend a Google search for "critical aperture" and hope that you'll find an english explanation including the formulas to calculate it for your setup.
Chris™ is offline   Reply With Quote

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 7:26 AM.