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How to Adapt a Door Viewer "Fish-eye Lens" on to a Full-size Camera

Step 6Adding a Felt Buffer for Your Camera Lens

Adding a Felt Buffer for Your Camera Lens
The door viewer adapter is essentially ready for use now. However, before butting it up against your camera lens, add a felt buffer to reduce the risk of scratching the glass. This should also correct any uneven areas that may leak in unwanted light.

Use the leftover piece of the reducer couple to trace out a ring in your scrap of felt (or other cloth), as it provides you both the exterior and interior circumference guides needed. Cut out the felt ring with a sharp pair of scissors, and then apply a layer of contact cement (or your choice of glue) to both the end of your adapter and the "scrap" side of the felt ring.

If you are using contact cement, wait 10 to 15 minutes before joining the two pieces together; otherwise, follow the manufacture guidelines on your choice of glue. Be careful when lining up the pieces for bonding, as the contact cement is essentially a one-shot effort. Once the ring is glued to adapter and set, you're ready to take pictures.

CAUTION: Even though the felt is intended to reduce the risk of scratching the lens, you will want to be careful when using the adapter. It happens that my particular model of camera has about a 1/8th-inch plastic border around the glass lens and the adapter rests mainly on this border, rather than the lens. Depending on your model of camera, the adapter ring may be seated on the glass. As a precaution, I would use a UV filter or similar functional filter to protect the lens, especially since a bridge camera cannot have its lens removed. At the very least, do not push the adapter against the lens and slide it around to adjust its position; rather, cap it gently over the lens and keep it in place when taking pictures. I am not responsible for any damaged equipment.
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