This lens arrived this week- after a lengthy trip from Kazakhstan. The front element has a lot of cleaning marks, but the lens looked new. The focus was "sticky", the lens needed a Lube Job.
This is not hard, but you can get yourself into trouble. As you take a lens apart, make Scribe Marks on the helical before taking screws out. On the J-3, there are multiple starting positions for the outer helical and the fine-thread inner helical. Screws often do best by keeping them in order, so that you can screw them back into the same hole they came out of. Often- grease/grime holds them in, be ready to use Alcohol or Lighter fluid to clean before unscrewing. The set screws are delicate, and the sides will break off.
Three screws hold the focus ring in place. To keep in order: I start with the ones past the Focus Index and keep in order.
Once the focus ring is off, the 3 set screws that hold the helical in the mount are visible. The KMZ munt uses 1. Take out the 3 screws, keeping in order. Then- see how much deeper the helical will screw into the mount. This will help you keep track of the correct number of turns when re-assembling. The KMZ focus mount: usually there is none/little margin. This ZOMZ- little margin. I have seen others with almost a full turn.
Helical Out.
Make Scribe Marks. I use two sets, a "single" and a "Double". This is to re-assemble using the same guide pin for each slot.
Run across ONE J-3 that cannot be reassembled because the screws for each hole are not interchageable, learn this trick...
This is not hard, but you can get yourself into trouble. As you take a lens apart, make Scribe Marks on the helical before taking screws out. On the J-3, there are multiple starting positions for the outer helical and the fine-thread inner helical. Screws often do best by keeping them in order, so that you can screw them back into the same hole they came out of. Often- grease/grime holds them in, be ready to use Alcohol or Lighter fluid to clean before unscrewing. The set screws are delicate, and the sides will break off.
Three screws hold the focus ring in place. To keep in order: I start with the ones past the Focus Index and keep in order.
Once the focus ring is off, the 3 set screws that hold the helical in the mount are visible. The KMZ munt uses 1. Take out the 3 screws, keeping in order. Then- see how much deeper the helical will screw into the mount. This will help you keep track of the correct number of turns when re-assembling. The KMZ focus mount: usually there is none/little margin. This ZOMZ- little margin. I have seen others with almost a full turn.
Helical Out.
Make Scribe Marks. I use two sets, a "single" and a "Double". This is to re-assemble using the same guide pin for each slot.
Run across ONE J-3 that cannot be reassembled because the screws for each hole are not interchageable, learn this trick...
