Extention tube ?'s

[wickidwombat]

for flash I got one of these

http://www.ebay.com.au/itm/150684587432?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

can use 2 580ex flash and point where you like, mount it to a cheap ebay tripod foot for the 100 and then fix the camera to a focusing rail

I also use the kenko tubes, you can also use the kenko 1.4 DGX TC aswell for that extra boost

 

[moreorless]

One more expensive alternative I'd heard mention is using the Canon lifesize converter for the old 50mm 2.5 macro. While it was marketed exclusively for use with that lens I'v seen comments that it will work with any EF(not EF-S) lens such as the 100mm IS L macro. Seems like its a mix of extension tube and teleconverter optimised for macro.

 

[Jettatore]

thank you one and all for responding. I learned a lot. cheers

 

[funkboy]

I've got the Kenko set & just carry the 12mm ring in my bag all the time. Works really well with my 85 1.8, and have used it a bit with the long end of my 24-105L just to have IS.

One thing I found kind of cool with the short rings like the 12mm is that while you of course loose infinity focus, with longer telephotos like my 135L it will still focus out to a few meters. Handy in a pinch for getting a close-up of something you can't get closer to...

 

[Mt Spokane Photography]

I've got the Kenko set & just carry the 12mm ring in my bag all the time. Works really well with my 85 1.8, and have used it a bit with the long end of my 24-105L just to have IS.

One thing I found kind of cool with the short rings like the 12mm is that while you of course loose infinity focus, with longer telephotos like my 135L it will still focus out to a few meters. Handy in a pinch for getting a close-up of something you can't get closer to...

A extension ring requires you to get closer. A TC will let you say at the same point and get some magnification.

 

[wickidwombat]

I've got the Kenko set & just carry the 12mm ring in my bag all the time. Works really well with my 85 1.8, and have used it a bit with the long end of my 24-105L just to have IS.

One thing I found kind of cool with the short rings like the 12mm is that while you of course loose infinity focus, with longer telephotos like my 135L it will still focus out to a few meters. Handy in a pinch for getting a close-up of something you can't get closer to...

A extension ring requires you to get closer. A TC will let you say at the same point and get some magnification.

and if you stick both on you can really get stuck in nice and close

 

[sammy]

I've been interested in extension tubes, are there some easy formulas to work out magnification for a lens? I gather the MFD doesn't change with one?

 

[dr croubie]

I've been interested in extension tubes, are there some easy formulas to work out magnification for a lens? I gather the MFD doesn't change with one?

If you missed my post on the last page, just read this link, it's what i've tested so far with my tubes (and lensbaby diopters).
MFD does change, and there's no easy formula (afaik), there's only one for a 'thin lens' (ie, ideal lenses that you can't buy in real life, closest you'd get is a lensbaby single glass or a pinhole). Real lenses have many more elements so the maths get a lot lot harder, easier to just experiment like I did for that link...

 

[sammy]

I've been interested in extension tubes, are there some easy formulas to work out magnification for a lens? I gather the MFD doesn't change with one?

If you missed my post on the last page, just read this link, it's what i've tested so far with my tubes (and lensbaby diopters).
MFD does change, and there's no easy formula (afaik), there's only one for a 'thin lens' (ie, ideal lenses that you can't buy in real life, closest you'd get is a lensbaby single glass or a pinhole). Real lenses have many more elements so the maths get a lot lot harder, easier to just experiment like I did for that link...

Thanks, I'm going through it now taking it in and while I don't have those exact combinations looks like a good starting point

 

[funkboy]

and if you stick both on you can really get stuck in nice and close

Yep, tried that too on my old 70-200 f/4L non-IS before I sold it. I could get an AF lock out as far as about 4m on the tele end of it.