TPO 1.25″ Focal Reducer – 0.5X

The TPO 0.5x focal reducer screws onto any 1.25″ eyepiece barrel and provides a nominal reduction of 0.5X. The actual focal length reduction will vary a little over or under 0.5x depending on where the focal reducer is placed exactly in the optical path. The TPO .5X reducer features a 2-element fully multi-coated optical design and blackened lens edges in a black anodized aluminum filter cell. It also has additional 1.25″ filter threads, so you can screw/stack additional filters on to this reducer.

The actual reduction will vary a little over or under 0.5x depending on exactly where the focal reducer is placed in the optical path. The exact focal length specification of this reducer has not been provided by the manufacturer, but we estimate it to be approximately 101-103mm. Hence, the “working distance” of this specific reducer is estimated to be 51mm, i.e., this reducer will provide a reduction of 0.5x when the center of its lens assembly is placed 51mm from the focal plane of the eyepiece or imaging device. Move the focal reducer closer to the eyepiece/camera and its reduction factor will increase. Move it away and the reduction provided will decrease.

By using additional spacers or extension tubes (sold separately), you can vary the amount of reduction you obtain with this reducer as follows:

TPO Product Number: FR-ONLY

• Blackened Lens Edges
• 2 Element Fully Multi-Coated Optics
• Stackable Threaded Design
• Nominal Reduction of 0.5X
• Size: 1.25 inches

• TPO 1.25″ Focal Reducer – 0.5X