Explore Scientific 2X Focal Extender with Adapter - 2" - FE02-020 Focal Extender rather than a thumbscrew that

rather than a thumbscrew that contacts the eyepiece barrel directly

the Hyperion field stop locations have been re-designed and optimized to give the shortest focus position possible (important for binoviewer use)

Explore Scientific Product Number: TDMN152CRDL

The TeleVue Dioptrx Adapter - DNA-6000 is recommended only for deep-sky use

Explore Scientific 2X Focal Extender with Adapter - 2" - FE02-020 Focal Extender rather than a thumbscrew thatAbout the Explore Scientific 2X Focal Extender w Adapter 2" An Explore Scientific Focal Extender does exactly what the name implies; it extends the effective focal length of the lens that it is used in conjunction with, thus producing higher magnifications for imaging and visual applications. Focal extenders are similar to a Barlow or tele negative lens, but there is one important difference between the two that you will want to take into