I wrote this pattern for my Canon 18-55mm and 75-300mm lenses, but it can easily be adapted for other lenses of varying width and length. You will need more yarn than the pattern calls for if your lenses are wider/longer.

Instructions on alterations included in the link!

Gauge is not so important for this pattern, but I included the gauge on my finished pieces as a general guide.

Other necessary materials:

A bit of thread
A button