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Orion Telescopes
Orion 2"/M48 Extension Spacer Ring Set
$49.99
 
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  • Set of five 2"/M48 spacer rings including 5mm, 10mm, 20mm, and 30mm lengths, plus a Variable Spacer Ring (~9-14mm)
  • Each ring has an internal (female) and external (male) M48x0.75 thread
  • Useful for setting the proper backfocus distance between camera sensor and coma corrector or field flattener
  • The versatile Variable Spacer Ring provides adjustable spacing from 9mm to 14mm
  • For use with 48mm (2") accessories and cameras with a 48mm T-ring or thread mount.


Learn more
Item #  52715

Spacing . . . the final frontier. Of astrophotography, we mean. Why not boldly go where many astrophotographers have gone before and get the Orion 2"/M48 Extension Spacer Ring Set, to ensure your camera is at the proper backfocus distance for your imaging telescope?

Setting the correct back-focus distance is crucial to achieving sharp, high-quality celestial images. If the back-focus distance is off, by a couple millimeters or more, the image may appear out of focus. Stars at the periphery of the image frame will appear elongated instead of pinpoint sharp. Focal reducers and field flatteners used in your imaging train have specific backfocus requirements, so it is important that your camera's sensor be set at that exact distance from the reducer or flattener's rear mechanical flange.

The Orion 2"/M48 Extension Spacer Ring Set comprises four separate anodized aluminum rings of 5mm, 10mm, 20mm, and 30mm lengths, plus a Variable Spacer Ring that can be set to a length anywhere between 9mm and 14mm. Each ring has an internal (female) and external (male) M48x0.75 thread. Any two or more rings can be used in combination to provide the precise amount of extension you need beyond the individual fixed ring lengths. Maximum extension length of this set is 79mm.

The Variable Spacer Ring consists of a fixed spacer ring with a lock ring that threads onto the male thread of the fixed ring. By adjusting the lock ring's position over the male thread, you can vary the total spacing desired from 9mm to 14mm.

The outer diameter of the rings is 50.7mm (1.99"). Weight of entire set is 64g (2.3 oz.). For use with 48mm (2") accessories and cameras with a 48mm T-ring or thread mount.

Warranty

Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-447-1001.

5mm M48 Extension Ring
10mm M48 Extension Ring
20mm M48 Extension Ring
30mm M48 Extension Ring
Variable Extension Ring (~9mm-14mm)

Orders received by 1pm Eastern Standard Time for in-stock items ship the same business day. Order received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

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