Saturday, April 14, 2007

Converting a 57mm Macro Tube to a 58mm

To convert my macro tube I elected to use spacer 1. To prepare the pieces the spacer was cleaned with soapy water then dried. Same for the filter ring after the glass and retainer were removed. Once dried I started mixing the two part epoxy. I used JB Weld for its strength and 15 minute setting time. Anything from 15 to 30 minutes is good. The faster epoxies tend to become brittle especially with exposure to sun. And never use cyanoacrylate glue such as Super Glue/Mighty Bond/Krazy Glue. The fumes from this glue is the same used by forensic investigators to lift fingerprints from evidence. Keep those away from optics.

The finished product ready to accept 58mm

The epoxy will be a soft goop but shouldn't run. Make sure its as close to a 1:1 ratio. Now apply the epoxy with a disposable blade or a credit card to the male thread of the spacer. Apply a small amount to the inner thread of the filter. Be careful not to get any on the inner thread of the spacer and the rear thread of the filter. Use a stable surface to put the two together. Press and turn to even it out.

Epoxy will probably be spilling out the inside and the side. Use a blade or credit card to scrape the excess out. If any get on a thread, use a wet towelette or your fingers to wipe (make sure you wash your hands before eating!). On a stable flat surface, hold the assembly to the light to make sure they are lined up. Cleaning may protrude part of the filter outside of the spacer's ring. Just push slightly in whatever direction to adjust.

Set the assembly aside in a warm undisturbed place overnight. After the setting time has elapsed it's ready.

No comments: