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I have a Canon 1200D and I have a Tokina f2.8 100mm macro lens. I would like to achieve up to 5x magnification. Which bellows should I use?

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Using this Extension Calculator it looks like it may be difficult to find a bellows with the amount of extension you need.

To achieve 5:1 magnification with a 100mm lens, you need to have a lens extension of approx 400mm or 15 inches.

You will also need a bellows that has electrical contacts so that you can control the aperture on your Tamron lens. Bellows without electrical contacts are much cheaper, but next to impossible to use, since there is no way to control the aperture on modern AF lenses.

This $759 Novoflex Bellows for Canon EOS has a maximum extension of 5.12 inches and would only allow approx 2.3x magnification with your 100mm lens.

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If you really need 5x magnification, your best bet is probably the $1,049 Canon MP-E 65mm 1-5x Macro.

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  • To take a 100mm 1:1 lens to 5:1, the bellows pictured will not be long enough, even at full extension. – Michael C Mar 12 at 18:17
  • Cascading two bellows (or adding extension rings)? – rackandboneman Mar 12 at 22:35
  • Will i get an adapter for the tokina 100mm to be used with this ? If so which one? – beegee Assem Mar 13 at 10:24
  • There is no need for an adapter if you get a bellows with the Canon EF mount. bhphotovideo.com/c/product/197081-REG/… – Mike Sowsun Mar 13 at 13:14
  • Just using the calculator... a Canon APS-C sensor has a diagonal of roughly 27mm. With a 100mm lens, the native magnification is about 3.7x (at 1:1 scale macro but this assumes no lens breathing and a true 100mm focal length). A 5" bellows (127mm extension) would take that to 4.97x. Based on this, it seems like the Novoflex bellows just get you to the 5x. The Canon MP-E 65mm certainly would. – Tim Campbell Mar 14 at 2:31

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