Tenpa Magnifying Eyepiece 1.36x for Canon tiffen These take a 625-type battery

These take a 625-type battery (which is included) but the only thing you'll lose if you run without a battery is metering: all the speeds are mechanical and aperture can be adjusted manually

1/4" thread up top for a camera

Interior dimensions at the top opening are approximately 9x17x20cm

which I feel we should mention is not included)

Don’t worry

Tenpa Magnifying Eyepiece 1.36x for Canon tiffen These take a 625-type batteryThis is a slip on 1. 36x magnifying eyepiece for select Canon cameras. Specifically, this will work on the D30, D60, 300D, 350D, 10, 20, 30, 40, 50, and 60D, 5D MK I and II, and the 1D 1DS MK I and II. This accessory makes it difficult to see the entire viewfinder you've got to peer around to see the corners and edges but does provide a high quality magnified image for precision focusing. In excellent condition, with original box.