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OPTEC Lepus .62x Telecompressor Reducer
OPTEC Lepus .62x Telecompressor is optimized for 100mm of distance between the last lens surface and the image plane. Measured from the telecompressor flange, this distance works out to 105mm. Assuming a native focal ratio of f/10, the Lepus 0.62X will reduce the effective focal ratio to approximately f/6.2. Shifting the image plane outward will provide additional reduction but a loss of star quality at the edge of the images. The optimal distance for most SCT’s is 100mm with the exception of the C9.25 EdgeHD SCT.
Lepus can will deliver a fully unvignetted image 22mm in diameter, but will provide well-corrected images out to 28mm with a small amount of light fall-off. Flat fielding is recommended for best results.
Standard Edition Lepus 0.62X telecompressor lens designed for use with any telescope having the TCF-S or other 2-inch focuser in place. Works well with Meade ACF f/10 and f/8 coma-free SCT telescopes. The Lepus 0.62X Standard Edition is housed in a 2-inch barrel-like assembly and will fit into any telescope receiver for standard 2-inch eyepieces.
The camera side connection for the Lepus 0.62X telecompressor is a broad dovetail known as the OPTEC-2100. The proper back-focus distance to the camera image plane is maintained with Optec’s custom camera-specific Lepus mounts available separately below. The OPTEC-2100 interface also allows easy connection to the Pyxis 2″ rotator in place of the standard 2-inch nosepiece. When connected to the camera, Lepus will appear as a long 2-inch nosepiece that fits into any 2-inch focuser or eyepiece receiver.
Special DSLR adapters are available from stock for Canon and Nikon cameras which hold and maintain the 100mm on-axis back-focus distance.
The Lepus can be used with other telescope designs but is not parfocal. Therefore, some re-focusing will be required. Performance is not guaranteed with all telescope optical designs and the Lepus is not recommended for use with Ritchey-Chretien telescopes.
