Extension tubes

[Chukie]

Has any one used the Kenko DG Extension tubes with a canon 100-400is len's if so what sort of results are you getting
Thx in advance
Trev

[Geoff F]

Haven't got that lens, Trev, but what exactly are you wanting to do?

Tubes are normally used to get a macro lens even closer; although I have used a 25 mm tube with my Sigma 150-500 for a sort of macro shot of insects.

One problem with tubes is that you will lose the ability to focus at infinity; but that doesn't matter with macro only work.

I did successfully use a 25 mm tube with my Canon 70-300 lens but this has a relatively close focusing 'macro' length of around 3 ft. to start with.

The only other downside is a slight loss of light levels so you might have to increase the ISO slightly.

[Chukie]

Originally Posted by Geoff F

Haven't got that lens, Trev, but what exactly are you wanting to do?

Tubes are normally used to get a macro lens even closer; although I have used a 25 mm tube with my Sigma 150-500 for a sort of macro shot of insects.

One problem with tubes is that you will lose the ability to focus at infinity; but that doesn't matter with macro only work.

I did successfully use a 25 mm tube with my Canon 70-300 lens but this has a relatively close focusing 'macro' length of around 3 ft. to start with.

The only other downside is a slight loss of light levels so you might have to increase the ISO slightly.

Thx for that it was to try and get a bit closer focusing to butterfly's and dragonfly's I have seen some real nice shots of butterfly's using this lens I have a sigma 105EX macro lens but thought it may be handy to be able to be a bit further away with the 100-400

[Geoff F]

In that case, Trev, have you also considered a converter to increase the magnification as an alternative?

They will work with that lens and also give a bit more extra for the distant birds. etc.

A x2 converter will lose autofocus but a x1.4 should prove ideal. And not a massive amount dearer than tubes.

ps. The Canon converter will be acceptable for this lens but not the Sigma macro. However, a Sigma or alternative third party converter may well work with both lenses. But check before purchase.