ZWO Darkening Ring Set for EFW & APS-C or Full Frame ASI Cameras* - DR-D88 type-finders-polarscopes-and-brackets This is not an optical

This is not an optical polar scope in that you cannot look through it

Unique imaging enhancement technique is used

objects are not only easier to locate

8° only minimal performance loss at edge of FOV Wavelength range 400 - 700 nm Spot size < 4

the iOptron HEM27EC delivers unparalleled weight to payload efficiency

ZWO Darkening Ring Set for EFW & APS-C or Full Frame ASI Cameras* - DR-D88 type-finders-polarscopes-and-brackets This is not an opticalThe D88 Darkening Ring Set will help solve any possible light leak issue occurring in the gap between EFW 2" or 36 mm seven position filter wheels and all ASI APS C or Full Frame cameras *except the ASI461MM P, which uses the ZWO D90 Darkening Ring Set. The D88 set includes four (4) rings. All have an external diameter of 88 mm and are approximately 0. 2 mm thick. Two have an inside diameter of 55 mm and two have an inside diameter of 58 mm. The 55 mm