Tele Vue 0.25" Accessory Tube For 2.4" (TLA-0250) 20x Binoculars 25" with twist-lock retainer

25" with twist-lock retainer

The Baader clear glass filters are used to focus a camera when using very narrow band line filters (due to same mechanical thickness)

Since the T-ring is camera-brand specific

you'll be able to enjoy a wide range of high and low power views—and switch between them quickly and easily

the distinctive pattern was invented by Russian amateur astrophotographer Pavel Bahtinov

Tele Vue 0.25" Accessory Tube For 2.4" (TLA-0250) 20x Binoculars 25" with twist-lock retainer0. 25" Length Accessory Tube for 2. 4" adds 0. 250" (6. 4mm) extension between Imaging System accessories. Focuser extensions of various lengths are often used to create the necessary distance for proper spacing of field lenses to imager; the required distance will vary depending on camera specifications. All are black anodized aluminum with anti reflection threads for maximum contrast.