Weekly Macro/Close-up thread for 10 January 2010

Started Jan 10, 2010 | Discussions thread
OP Gautam Majumdar Forum Pro • Posts: 13,264
Re: First time macro

There are two ways one can use a lens reversed.

First is to join two lenses together. In this technique you attach the longer lens normally to the camera body and then use a coupling ring to attach a shorter lens to the first lens in reversed position. The coupling ring attaches two lenses by their filter threads. The magnification is calculated by dividing the focal length of the longer lens by that of the shorter lens (a 50mm lens reversed on a 100mm lens will give you 2x magnification). The reversed lens acts as a high quality close-up filter. The advantage is that all the auto funtions, i.e, metering, focusing, etc are maintained. The coupling ring is quite cheap but you may need a step-up/down ring to match the lens threads of both the lenses. The disadvantage is that the whole assembly is a bit unwieldy and the minimum focusing distance is very short.

The second method is to use a reversing ring to attach a lens directly to the camera body but in reversed position. The reversing ring attaches to the camera body on one side and to the filter thread of the lens on the other side. These rings are more costly but the whole system is less unwieldy. However, you lose all the auto function. There are some reversing rings which can maintain auto functions but they cost as much as a macro lens. The magnification depends on the focal length of the lens.

Iamah used the first method.

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Gautam

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