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A silly macro question

Discussion

3 replies
Posted by Chris Lloyd on May 27, 2008 at 10:07 AM
Hi All,

Seeing John's recent macro question has prompted me to ask the following -

If I combined a set of Kenko extension tubes with a Sigma 150mm, would this allow me to photograph at greater than lifesize reproduction?

TIA.

Regards Chris. :toast: :toast: :wavey:
Posted by PhilH on May 27, 2008 at 10:27 AM
Yes, at the expense of working distance, you can also use converters to increase the mag, the 1.4 will increase it to x1.4 and a 2x will effectively double the mag, using converters will not reduce the working distance.... If there is a problem fitting the converter to the lens simply place a 12mm extension tube between them.

HTH and is not too garbled rushing between various problems here.

Phil
Posted by Matt Cole on May 27, 2008 at 10:43 AM
68mm of extension tubes will increase the maximum magnification from 1:1 (lifesize) to 1.45:1 i.e. almost 1.5x lifesize. The increase in magnification is calculated by dividing the length of extension tubes by the focal length of the lens, so 68/150 = 0.45. One of the disadvantages of long focal length macro lenses (e.g. 150mm or 180mm) is that tubes have less impact on magnification compared to, say, a 60mm macro lens.

Matt
Posted by Jeroen Stel on May 28, 2008 at 5:27 AM
I do it all the times!
Works very well!

Another option would be to use a reversed lens mounted on a plastic camera cap (after drilling a hole the size of the frontside of the nes ofcourse) and to use this combined with a couple of extension tubes.

Greetings,

Jeroen Stel