This page will show a simple way to check your Leica-R lens clearance for Sigma cameras. | |
First, you have to turn the focusing ring until infinity, so the rear glass will move to its maximum outside reach . |
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Now, make a kind of cardboard bridge, we don't want anything metallic or too hard near our Leica glass. For my calculations, the "legs" could be 10.2 mm long, but I made them a bit shorter to be on the safe side. |
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As you can see, the rear Leica lens glass itself will not hit the Sigma's camera body internal dust-protection window. |
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But the Leica lens barrel protective ending will. |
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Measure how much the rear end of the barrel has to be grounded off and make a mark at the both sides with a needle. |
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Now we have to protect the lens, I use raw cotton that also will trap metallic particles. |
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Also I use a piece of paper tape that will make possible to file it easily. |
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Now, we can start filing until we reach the marks. |
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When you reach the marks, turn the lens upside down and remove the cotton protection. |
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Remove the few metal particles that trespassed the protection. I use our plastic tool wrapped with cotton. |
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Now check the result with your cardboard bridge. |
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I painted the exposed metal with my flat black marker from Micro-Tools. |
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Painted, now we can remove the Leica bayonet and install the Leica-Sigma one. |
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And you can see in this picture the Elmarit 28/2.8 reaching infinity without any problem on Sigma cameras. |
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