Extension Tubes - Full Disclosure

[paulnj]

You are speaking of a telecoverter An extention tube allows you to focus at a shorter distance, while a TC magnifies your focal length(making the subject larger in your frame)

For birds at that distance a 500mm would be a start. Why not put a feeder 10 feet from the window instead

[OBie]

You are speaking of a telecoverter An extention tube allows you to focus at a shorter distance, while a TC magnifies your focal length(making the subject larger in your frame)

Oh man - I can't believe after reading this entire thread that I got that wrong! Comprehension is not my strong suit. Good thing school is waaaay behind me.

So I need to look into a TC for the Sigma (assuming I keep it!)?

Why not put a feeder 10 feet from the window instead

:mad2: LOL! I thought of that just after posting.. DUH! That I can do.

[Loupey]

OBie, perhaps it will help to differentiate these this way:

1) If you're too close and your lens won't focus any closer, then think "extension tubes"

and
2) If you're wishing that the image in your viewfinder was closer/more magnified, then think "teleconverters". These are also called multipliers.

As for your Sigma, I'm kinda worried about that. If it isn't taking clear pictures already, adding any accessory will make the problem worse.