Nikon D810A vs OM SYSTEM OM-3 ASTRO

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D810A compared with OM-3 ASTRO

	NikonD810A	OM SYSTEMOM-3 ASTRO
Overview
Released
Released	May 2015	February 2026
Image and sensor
Camera type
Camera type	DSLR	Mirrorless
Sensor format
Sensor format	Full frame	Four Thirds
Sensor type
Sensor type	CMOS	Stacked BSI Live MOS
Sensor dimensions
Sensor dimensions	35.9 × 24 mm	17.3 × 13 mm
Effective resolution
Effective resolution	36.3 MP	20.4 MP
Largest image
Largest image	7360 × 4912	5184 × 3888
RAW recording
RAW recording	Yes	Yes
Standard ISO range
Standard ISO range	200–12800	–
Sensor detail
Sensor detail	FX CMOS with 36.3 million effective pixels USA/global or 36.35 million Japan, 37.09 million total; no optical low-pass filter. Modified IR-cut filter transmits four times more H-alpha light than D810. Nikon warns of red casts under near-infrared-rich lighting or with reflective subjects and does not recommend general photography. Image Sensor Cleaning and Image Dust Off; FX 7360 × 4912, 1.2× crop 6144 × 4080, DX 4800 × 3200 and 5:4 crop 6144 × 4912	Approximately 20.37 effective megapixels (maker Japan), rounded to 20.4 in UK table; 22.9 total megapixels. Modified infrared-cut filter transmits approximately 100% at Hα 656 nm and SII 672 nm (maker Japan illustration, not a guaranteed spectral curve)
Image formats
Image formats	12-bit or 14-bit NEF RAW, uncompressed, lossless-compressed or compressed; Small RAW fixed at 12-bit uncompressed. TIFF RGB, JPEG Fine/Normal/Basic with size-priority or optimal-quality compression, simultaneous RAW/JPEG; Flat and adjustable/custom Picture Controls	Ordinary JPEG and 12-bit RAW at 5184×3888; composite output up to 50 MP handheld or 80 MP tripod, with 12/14-bit high-resolution RAW. Composite resolution is not native sensor resolution
ISO detail
ISO detail	Standard ISO 200–12800 in one-third, half or whole stops; Lo expansion to ISO 100 equivalent and Hi expansion to ISO 51200 equivalent; automatic sensitivity control	Maker UK manual and Auto range extends from LOW approximately ISO 80 to 102400, Auto upper default 25600; maker Japan lists standard maximum 25600
Image processor
Image processor	EXPEED 4	TruePic X
Lens and shooting
Lens mount
Lens mount	Nikon F mount	Micro Four Thirds
Stabilisation
Stabilisation	Optical lens stabilisation	Lens and sensor shift
Maximum continuous burst
Maximum continuous burst	5 fps	120 fps
Lens detail
Lens detail	F mount with body AF coupling and contacts; G/E/D, other AF and AI-P lenses with restrictions; non-CPU AI lenses usable in A/M/M* with registered lens data, DX lenses use DX crop. Non-AI, IX and F3AF lenses excluded; USA G/H notation conflicts with Japan A/M/M*	–
Autofocus
Autofocus	Advanced Multi-CAM3500FX phase detection with 51 points, 15 cross-type and 11 f/8-compatible points; -2 to +19 EV at ISO 100 equivalent, 20°C. AF-S/AF-C, fine-tuning, single-point, dynamic nine/21/51, 3D tracking, group-area and auto-area. Live view uses contrast AF-S/AF-F and face/wide/normal/tracking areas; current USA detection-range -1 EV entry conflicts with its own -2 EV sensitivity entry and Japan, while AF-A listings conflict with Japan modes	1053 cross-type phase detection positions and 1053 contrast positions; Starry Sky AF plus human, bird, animal and vehicle recognition
Shutter
Shutter	Electronically controlled vertical-travel focal-plane shutter, 1/8000 to 30 seconds, Bulb and Time; electronic front curtain in mirror-up mode. M* adds 4/5/8/10/15/20/30/60/120/180/240/300/600/900-second presets. X-sync 1/250 second, up to 1/320 with reduced flash range	Mechanical 1/8000–60 seconds; electronic 1/32000–60 seconds; Bulb up to 30 minutes and Live Composite
Burst detail
Burst detail	Approximately 5 fps full FX or 5:4 and 6 fps DX or 1.2× crop on EN-EL15. DX reaches 7 fps with MB-D12 using batteries other than EN-EL15, or qualifying AC power; 1.2× remains 6 fps. Quiet continuous approximately 3 fps. M* continuous shooting at exposures of 4 seconds or longer removes the 100-shot limit, subject to battery/card capacity	Mechanical approximately 6 fps; electronic approximately 20 fps, SH1 up to 120 fps with focus/exposure fixed at first frame, SH2 up to 50 fps with compatible lenses. Maker examples at 120 fps 88 RAW/90 JPEG, at 50 fps 102 RAW/125 JPEG, with specified KIOXIA card and 12–40mm F2.8 PRO II
Stabilisation detail
Stabilisation detail	VR depends on attached lens; no sensor-shift stabilisation	Five-axis sensor shift rated up to 6.5 central/5.5 corner stops with 12–45mm F4 PRO at 45mm; Sync IS up to 7.5 central/6.5 corner with 12–100mm F4 IS PRO at 100mm and half-press stabilisation off
Flash
Flash	Built-in i-TTL pop-up flash, guide number approximately 12 m at ISO 100, 20°C; commander mode, hot shoe, PC sync terminal and compatible Auto FP Speedlights	–
Exposure controls
Exposure controls	P/S/A/M and long-exposure M*; 91000-pixel RGB matrix, centre-weighted, spot and highlight-weighted metering; ±5 EV compensation and exposure/flash/white-balance bracketing; HDR, interval timer and virtual horizon. Japan centre-weighted default 12 mm and spot range 2–20 EV differ from USA 8 mm and 0–20 EV	C1/C2 astrophotography presets, C3 handheld night scenes; 12-shot astrophotography stacking and star-motion alignment. Generic high-resolution table also describes an eight-shot mode. Live ND up to ND64, Live GND, HDR, focus stacking and Live Composite
Video
Highest video resolution
Highest video resolution	1920 × 1080 at 60 fps	4096 × 2160 at 60 fps
Video detail
Video detail	FX- or DX-based 1920 × 1080 at 60p/50p/30p/25p/24p and 1280 × 720 at 60p/50p; MOV H.264/MPEG-4 AVC with linear PCM. Full HD 60p/50p limit 10 minutes high quality or 20 normal; other modes 20 minutes high or 29 min 59 s normal. Time-lapse movies; current USA general 20-minute limit omits mode/quality differences	Internal C4K 4096×2160 or UHD 3840×2160 up to 60p; H.264 or HEVC/H.265 MOV. H.264 table specifies 8-bit 4:2:0; OM-Log400, HLG and OM-Cinema1/2 profiles. Separate FHD high-speed up to 240 fps; HDMI 12-bit RAW is external output, not internal recording
Audio
Audio	Built-in stereo microphone; external 3.5 mm stereo input and headphone output, adjustable microphone sensitivity	Stereo microphones; 3.5 mm external microphone and headphone sockets; 48 kHz/16-bit or 96 kHz/24-bit PCM
Screen and viewfinder
Viewfinder
Viewfinder	Optical	Electronic
Screen size
Screen size	3.2″	3″
Screen dots
Screen dots	1,229,000	1,620,000
Touchscreen
Touchscreen	No	Yes
Tilting screen
Tilting screen	No	Yes
Display detail
Display detail	Fixed 3.2-inch TFT, approximately 1229000 dots, 170° viewing angle and approximately 100% coverage; brightness adjustment and top status LCD. Exposure preview simulates 30 seconds for longer exposures, with up to 23× live-view enlargement; viewfinder virtual horizon illuminated red	Fully articulated 3-inch approximately 1.62-million-dot touchscreen
Viewfinder detail
Viewfinder detail	Pentaprism; approximately 100% FX coverage, 97% DX/1.2× and 100% vertical/97% horizontal 5:4. Approximately 0.7× magnification with 50mm f/1.4 at infinity, 17 mm eyepoint, grid and depth-of-field preview	OLED approximately 2.36 million dots, approximately 100% coverage; maximum 1.37× magnification with 50mm lens at infinity at −1 dioptre, depending on finder style
Connections and design
Wi-Fi
Wi-Fi	–	Yes
Bluetooth
Bluetooth	–	Yes
Battery life (maker's claim)
Battery life (maker's claim)	1200 photographs	590 photographs
Body weight
Body weight	880 g	413 g (better)
Release detail
Release detail	May 2015 release month; Nikon Japan records actual sale on 28 May, with global announcement dated 10 February. The regional day does not establish earliest worldwide sale	Japan on sale 27 February 2026, made to order; month precision retained because the exact first sale in other regions is unconfirmed
Recording media
Recording media	One Type I CompactFlash slot with UDMA and one SD/SDHC/SDXC slot with UHS-I; overflow, backup, RAW/JPEG split and copying between cards	One SD/SDHC/SDXC slot; UHS-I and UHS-II
Ports
Ports	USB 3.0 Micro-B, mini HDMI Type C, 3.5 mm microphone and headphone sockets, PC sync and 10-pin remote/GPS terminal; wired LAN requires optional UT-1	USB 3 Type-C, micro-HDMI Type D, 3.5 mm microphone/headphone sockets, hot shoe and flash sync socket; no wired remote-release input (Amateur Photographer)
Wireless connections
Wireless connections	No built-in Wi-Fi or GPS; optional WT-5 with UT-1, GP-1/GP-1A GPS, WR-R10 with WR-A10 or WR-1. Japan marks WR-1 unsupported in M* mode	Bluetooth Low Energy 5.2 and Wi-Fi; location tagging from smartphone GPS; RM-WR2 Bluetooth remote, RM-WR1 unsupported
Battery life detail
Battery life detail	EN-EL15, approximately 1200 CIPA shots. Original global announcement separately claims up to 3860 without built-in flash or immediate playback, and up to 10660 using body EN-EL15 plus grip EN-EL18a under those conditions; these are distinct from CIPA. Optional MB-D12 takes EN-EL15, EN-EL18/EN-EL18a with BL-5 or eight AA cells	BLX-1; approximately 590 standard or 1040 Quick Sleep shots with specified KIOXIA card; approximately 120 minutes CIPA video or 190 minutes with zoom and other operations disabled
Charging
Charging	External MH-25a charger; optional EH-5b AC adapter with EP-5B connector	In-camera USB charging and USB PD bus power; can operate while charging, subject to supply capability
Dimensions
Dimensions	Approximately 146 × 123 × 81.5 mm	Approximately 139.3×88.9×45.8 mm excluding protrusions
Weight detail
Weight detail	Approximately 880 g body only; 980 g with battery and SD card, excluding body cap	Approximately 413 g body only or 496 g with battery and card; maker Japan loaded figure excludes eyecup
Materials
Materials	Dust- and water-resistant sealing; magnesium-alloy body documented on Nikon USA refurbished product overview	IP53 or IPX1 depending on attached lens; operating temperature −10 to 40°C. Not an immersion rating
Colours
Colours	Black	Silver and black body with red ASTRO badge
In the box
In the box	EN-EL15, MH-25a, UC-E22 USB cable, AN-DC16 strap, BF-1B body cap, DK-17 eyepiece, USB/HDMI cable clips and BM-12 monitor cover (Japan package)	–