extension tubes + Sigma 105mm f/2.8 EX DG Lens

[katia]

can somebody recommend me a set of extension tubes for my Sigma 105mm f/2.8 EX DG Macro Lens? well, i suppose for my 50mm, too.

i've been wanting to do some close-ups of all the SPRING THINGS!! the thing that bothers me about this lens though is that i need to stand sooooo far back from my subject, it makes it very difficult to compose shots.

since this lens has a manual aperture ring it doesn't need to have an AF motor.

anything else to look out for?

i see some sets of extension tubes going for $6.99 on eBay...that can't be right, can it?

AF Macro Extension Tube for Nikon D5000 D7000 D90 D3100 | eBay

Macro Extension Tube Ring Nikon D40X D60 D90 D700 D300 on eBay.ca (item 170628893720 end time 22-Apr-11 11:45:46 EDT)

[Drkranger]

Jim Zuckerman recommended the Kenko tubes. They work great.

Amazon.com: Kenko DG Auto Extension Tube Set for the Nikon AF Mount.: Electronics

[katia]

Thanks! I was looking for something a bit cheaper, though. But the eBay ones are probably a waste of time. I don't really need ones that have AF, as I manually focus when doing macros anyways, and the lenses I would use with these have manual aperture rings.

Just don't wanna waste my time with eBay shipping unless I know somebody has the EXACT product, and will recommend it.