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Summicron Dual Range


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What exactly do you mean ? Summicron DR has (apart focusing and diaphragm) three "movements" :

 

1) Mounting - dismounting the goggle unit

2) Setting of the focusing helicoid from normal to short range

3) Dismounting the lenshead from the focusing mount (to use the lenshead on Visoflex/Bellows etc...)

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