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Khechog

DOF at distance when using extension tubes?

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Hi. I use photography in order to capture textures and light effects for use in digital montages. That means a fair bit of macro but also picking things out from a distance in clouds and high in trees. I also like to travel light so am looking at using the 90mm with an extension tube to cover all these bases and would like to avoid constantly removing and re-applying it if possible. How will the extension tube will affect focus for the distance shots? As I understand it I won't be able to focus from close by to infinity, but will I still have enough DOF to pick out a cloud I like, not caring what else is in focus? Or the play of light in some leaves at the top of a tree? I've looked on line but haven't got the technical knowledge to figure this out. Help appreciated.

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Extension tubes are for close up shots, not distance.

Working with extension  tubes  will give you narrow depth of field, so NO you wont have enough DOF to pick up a cloud.

 

Edited by jamjam
clarity

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I did a close focus check shortly after the 90mm lens was released and as I remember it maximum focus distance with the small 10mm ext tube was about 30 inches (just less than 1M). Had you thought of trying a Raynox or Canon 250 close up attachment which will at least save you removing the lens and both are of excellent quality and not to be confused with standard close-up filters. They do not require an adjustment to exposure.

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Had you thought of trying a Raynox or Canon 250 close up attachment 

Good shout, however the Raynox 250 is very powerful and gives an incredibly narrow DOF, at least when I have used it. I regretted not getting the slightly more expensive but much mire forgiving Raynox 150.

I get the impression the OP is thinking about objects within centimetres of the lens rather than millimetres, which is where I found the 250 worked.

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