"Exposed Threads" Front Ports - Optical Glass Thread Size:58 mm From there

From there

or want to step up your game

for a number of reasons

thru adaptors or clamps that optimal position and secure the dome to your un-threaded lens

including DSLRs

"Exposed Threads" Front Ports - Optical Glass Thread Size:58 mm From thereThese are "custom" versions of our Front Ports with two important differences: 1. The threads that attach to the lens are exposed. (See Questions page for details) 2. These Front Ports have external, exposed front threads that enable use with Polarizers or external filters. 49 thru 72mm sizes have external threads of 77mm. 77, 82, and 86mm sizes external threads are 89mm, which is not an industry standard, so you can use the Outex 89 95mm Step Up