Jump to content
  • Join the online East Midlands astronomy club today!

    With active forums, two dark sites and a knowledgeable membership, East Midlands Stargazers has something for everyone.

Acronyms and abbreviations


Recommended Posts

Acronyms and Abbreviations

Common terms:

RDF - Red Dot Finder

Bins - Binoculars

Obsy - Observatory

POW - Picture of the Week

POTM - Picture of the month


DSO - Deep Sky Object

BH - Black Hole

NS - Neutron Star

WD - White Dwarf

HDF - Hubble Deep Field

PN - Planetary Nebula

SR - Special Relativity

GR - General Relativity

QM - Quantum Mechanics


M - Messier Catalogue

NGC - New General Catalogue

C - Caldwell Catalogue

IC - Index Catalogue

HD - Henry Draper Star Catalogue

SH2 - Sharpless2 Nebula Catalogue

Mounts, Guiding, Location:

EQ - Equatorial (mount)

GEM - German Equatorial Mount

Alt-Az - Altitude-Azimuth (mount)

MF - Meridian Flip

OAG - Off Axis Guider

RA - Right Ascension

DEC - Declination

ALT - Altitude

AZ - Azimuth

LAT - Lattitude

LONG - Longitude

CM - Central Meridian


F/ratio - Focal Ratio

FOV - Field of View

CA - Chromatic Aberration

SA - Spherical Aberration

IR - Infra Red

UV - Ultra Violet


EP - Eyepieces

OTA - Optical Tube Assembly

Newt - Newtonian reflector telescope

Frac - Refractor telescope

Dob - Dobsonian mounted reflector telescope

Cat - Catadioptric optical system

PST - Personal Solar Telescope

Refractor specific:

ED - Extra-low Dispersion

Apo - Apochromat

Achro - Achromat

Doublet - (2 lens assembly)

Triplet - (3 lens assembly)

Catadioptric optical systems:

SCT - Schmidt-Cassegrain telescope

Mak - Maksutov-Cassegrain telescope

RCT - Ritchey-Chrétien telescope

SNT - Schmidt-Newtonian telescope

KCT - Klevtsov-Cassegrain telescope

MNT - Maksutov-Newtonian telescope (Mak-Newt)

Filters, Flatteners, Reducers:

FF - Field Flattener / Flat Field reduction

FR - Focal Reducer

LPR - Light Pollution Reduction

CLS - blocks light from street lamps, passes other visible light and H-alpha emissions.

IR-cut - IR blocking filter

IR-pass - IR pass filter

Astrophotography, imaging, video related:

DSLR - Digital Single Lens Reflex

CCD - Charge-coupled Device

LCD - Liquid Crystal Display

LED - Light-emitting Diode

CMOS - Complementary metal–oxide–semiconductor

CCTV - Closed Circuit Television

HDD - Hard Disk Drive

USB - Universal Serial Bus

RS232 - Serial Port/cable

HD - High Definition

RGB - Image is built from separate red, green and blue filtered images

LRGB - An RGB image augmented with a luminence channel. Actually, I have no idea what this means in reality as taking a true unfiltered luminence channel on a planet is pretty pointless IMO (In My Opinion).

IR-RGB - An RGB image that uses an IR (Infra Red) filtered image for luminance.

NBI - NarrowBand Imaging

KAF - Kodak Full Frame technology

CFA - Colour Filter Array

MP - megapixel

S/NR - signal to noise ratio

DSS - DeepSky Stacker

DR - dynamic range

HDR - High Dynamic Range

PS - Photoshop

OSC - One Shot Colour. (CCD camera that takes colour images without use of filters)

People, positions, organisations, places:

EMS - east Midlands Stargazers

SPM - Sir Patrick Moore

FLO - First Light Optics

SGL - StarGazersLounge

TS - TeleskopService

SW - skywatcher

OO - orion optics (the guys based in crewe)

TMB - Thomas M. Back (& lens assemblies of his design)

WO - WIlliam Optics

Tak - Takahashi

TV – Televue

S@N - Sky at Night

CN - Cloudy Nights (web forum)

UKAI - UK Astro Imaging Forum (web forum)

IS - Imaging Source (Camera company)

DMK/DBK/DFK - Cameras made by IS

PHD - Guide application software (Push Here Dummy)

CDC - Cartes Du Ciel (Planetarium Software)

AP - AstroPhysics (can be Astrophotography)

SBIG - Santa Barbara Instrument Group

SX - Starlight Xpress

HST - Hubble Space Telescope

NASA - National Aeronautics and Space Administration

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.