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The M39 lens mount is a screw thread mounting system for attaching lenses to 35 mm cameras, primarily rangefinder (RF) Leicas. It is also the most common mount for Photographic enlarger lenses. True Leica Thread-Mount (LTM) is 39 mm in diameter and has a thread of 26 turns-per-inch or threads-per-inch (tpi) (approximately 0.977 mm pitch) of ...
Messier 39 or M39, also known as NGC 7092, is an open cluster of stars in the constellation of Cygnus, sometimes referred to as the Pyramid Cluster. It is positioned two degrees south of the star Pi Cygni [ 7 ] and around 9° east-northeast of Deneb . [ 8 ]
NGC 2359 (also known as Thor's Helmet) is an emission nebula [3] in the constellation Canis Major.The nebula is approximately 3,670 parsecs (11.96 thousand light years) away and 30 light-years in size.
Sh 2-308, also designated as Sharpless 308, RCW 11, or LBN 1052, [1] and commonly known as the Dolphin-Head Nebula, is an H II region located near the center of the constellation Canis Major, composed of ionised hydrogen. [2] It is about 8 degrees south of Sirius, the brightest star in the night sky.
NGC 3324 is an open cluster in the southern constellation Carina, located northwest of the Carina Nebula (NGC 3372) [3] [4] at a distance of 9,100 ly (2,800 pc) from Earth. [2] It is closely associated with the emission nebula IC 2599 , also known as Gum 31 . [ 5 ]
Westerhout 40 or W40 (also designated Sharpless 64, Sh2-64, or RCW 174) is a star-forming region in the Milky Way located in the constellation Serpens. In this region, interstellar gas forming a diffuse nebula surrounds a cluster of several hundred new-born stars .
NGC 6357 is a diffuse nebula near NGC 6334 in the constellation Scorpius. The nebula contains many proto-stars shielded by dark discs of gas, and young stars wrapped in expanding "cocoons" or expanding gases surrounding these small stars. It is also known as the Lobster Nebula.
M1-92 (Minkowski 92), also known as Minkowski’s Footprint or the Footprint Nebula, is a bipolar protoplanetary nebula in the constellation of Cygnus. It is a type of reflection nebula , visible only by light reflected from the central star.