Canon RF 24mm F1.8 Macro IS STM

Canon RF 24mm F1.8 Macro IS STM

In stock for home delivery, contact us for store availability
  • RF-Mount/Full-Frame Format
  • Professional Bright Wide-Angle Lens
  • Aperture Range: f/1.8 to f/22
  • Minimum Focus Distance: 14cm
  • 0.5x Max Mag, Half Life-Sized Macro
  • 5 Stops Stabilisation, 6.5 with IBIS
  • Rounded 9-Blade Diaphragm
  • Quiet and Fast STM Focus
  • Filter Size: 52mm
  • Weight: 270g
£654.00
Canon RF 15-30mm F4.5-6.3 IS STM

Canon RF 15-30mm F4.5-6.3 IS STM

In stock for home delivery, contact us for store availability
  • RF-Mount/Full-Frame Format
  • Versatile Wide-Angle Zoom Lens
  • Aperture Range: f/4.5 to f/32
  • Minimum Focus Distance: 13cm
  • 0.5x Max Mag, Half Life-Sized Macro
  • 5.5 Stops Stabilisation, 7 with IBIS
  • Rounded 7-Blade Diaphragm
  • Quiet and Fast STM Focus
  • Filter Size: 67mm
  • Weight: 390g
£589.00
LensPen DSLR Pro cleaning kit NDSLRK-1

LensPen DSLR Pro cleaning kit NDSLRK-1

In stock for home delivery, contact us for store availability
  • Safe for all optical lenses
  • Long life 500+ uses
  • Carbon compound will not spill or dry out
£24.99
Kenro Kenair Air Duster Refill 360ml

Kenro Kenair Air Duster Refill 360ml

In stock for home delivery, contact us for store availability
  • Refill aerosol can (360ml capacity) for the Kenair Air Duster
  • Used to blow dust, fluff, lint, grit or other unwanted debris from surfaces or cavities
  • High performance cleaner for photo, video, computer and electronic equipment etc
£19.99
Kenro Kenair Air Duster Master Kit 360ml with nozzle

Kenro Kenair Air Duster Master Kit 360ml with nozzle

In stock for home delivery, contact us for store availability
  • Used to blow dust, fluff, lint, grit or other unwanted debris from surfaces or cavities
  • High performance cleaner for photo, video, computer and electronic equipment etc
  • Master kit with re-usable nozzle
£29.99
Kenro 35mm Film & Slide Scanner KNSC201

Kenro 35mm Film & Slide Scanner KNSC201

In stock for home delivery, contact us for store availability
  • Converts slides and negatives into JPEG digital images.
  • 14 megapixels / 22 megapixels (interpolated) resolution
  • Featuring a colour 2.4" TFT LCD display.
  • Accepts SD cards and can work independently from a PC.
  • Scanned images can be stored onto a PC via the USB port.
£119.99
Kenro 2x Magnification 35mm Slide Viewer ( KNSVX2 )

Kenro 2x Magnification 35mm Slide Viewer ( KNSVX2 )

In stock for home delivery, contact us for store availability
  • Handheld Slide viewer
  • LED light source
  • For 35mm slides
£24.99
Bushnell Solar Panel for Trail Camera

Bushnell Solar Panel for Trail Camera

In stock for home delivery, contact us for store availability
  • Extends Trail Camera battery life for months
  • Chargeable via USB cable (not included)
  • Adjustable screw-in bracket included
  • Positive locking cable attachment points for camera and solar panel
  • Charge level indicator on rear of panel
  • Compatible with Core, Prime and Aggressor Trail Cameras.
£149.00
Sandisk Extreme Plus 128GB 200MB/S Micro SDXC

Sandisk Extreme Plus 128GB 200MB/S Micro SDXC

Estimated delivery time: 31 working days
  • 128GB
  • 200MB/s read and 90MB/s write
  • Included SD adapter
£28.00
Nikon Z 400mm f/4.5 VR S NIKKOR

Nikon Z 400mm f/4.5 VR S NIKKOR

In stock for home delivery, contact us for store availability
  • Z-Mount Lens/Full-Frame Format
  • Super-Telephoto Prime Lens
  • 19 Elements in 13 Group Construction
  • Min. Focusing Distance: 2.5m
  • Wide/Bright Fixed F4.5 Aperture
  • Super ED Glass to Reduce Chromatic Aberration
  • Weather-Sealed to prevent Dust, Dirt & Moisture
  • Compatible with Nikon Z Converters
  • Weight: 1160g
  • Filter Size: 95mm
£3,079.00
Nikon Z 30 + Z DX 16-50mm VR & Z DX 50-250mm VR Twin Zoom Kit

Nikon Z 30 + Z DX 16-50mm VR & Z DX 50-250mm VR Twin Zoom Kit

In stock for home delivery, contact us for store availability
  • Great value twin zoom kit, with all the lens range you'll need
  • Dual Lens Kit with the Z 30 Camera
  • Small Build with Deep Grip Perfect for Handheld Shooting
  • 20.9 Megapixel DX-Format CMOS Sensor
  • 4K/30P UHD / 1080P/120P Video Recording
  • 3-inch Vari-Agnle Touchscreen Monitor
  • E-VR for Smooth Steady Footage
  • Bult-in Stereo Mic with Wind Reduction Mode
  • 11fps Continous Burst Shooting
  • Eye and Animal AF Detection in Video and Stills
  • Wi-Fi and Bluetooth Connectivity for Sharing Content
  • 20 In-Camera Creative Modes and Filters
£1,069.00
Nikon Z 30 + Z DX 16-50mm f/3.5-6.3 VR Zoom

Nikon Z 30 + Z DX 16-50mm f/3.5-6.3 VR Zoom

In stock for home delivery, contact us for store availability
  • Single Lens Kit with the Z 30 Camera
  • Small Build with Deep Grip Perfect for Handheld Shooting
  • 20.9 Megapixel DX-Format CMOS Sensor
  • 4K/30P UHD / 1080P/120P Video Recording
  • 3-inch Vari-Agnle Touchscreen Monitor
  • E-VR for Smooth Steady Footage
  • Bult-in Stereo Mic with Wind Reduction Mode
  • 11fps Continous Burst Shooting
  • Eye and Animal AF Detection in Video and Stills
  • Wi-Fi and Bluetooth Connectivity for Sharing Content
  • 20 In-Camera Creative Modes and Filters
£799.00
Nikon Z 30 Body

Nikon Z 30 Body

Estimated delivery time: 5 working days
  • Small Build with Deep Grip Perfect for Handheld Shooting
  • 20.9 Megapixel DX-Format CMOS Sensor
  • 4K/30P UHD / 1080P/120P Video Recording
  • 3-inch Vari-Agnle Touchscreen Monitor
  • E-VR for Smooth Steady Footage
  • Bult-in Stereo Mic with Wind Reduction Mode
  • 11fps Continous Burst Shooting
  • Eye and Animal AF Detection in Video and Stills
  • Wi-Fi and Bluetooth Connectivity for Sharing Content
  • 20 In-Camera Creative Modes and Filters
£649.00
Kenro Macro Ringflash for Nikon cameras ( KFL201N )

Kenro Macro Ringflash for Nikon cameras ( KFL201N )

In stock for home delivery, contact us for store availability
  • Great value Macro Ringflash
  • Dedicated to Nikon DSLR cameras
  • Enables shadow-free close up photography
  • Attaches to your existing lens
£139.99
Kenro Macro Ringflash for Canon EOS cameras ( KFL201C )

Kenro Macro Ringflash for Canon EOS cameras ( KFL201C )

Estimated delivery time: 5 working days
  • Great value Macro Ringflash
  • Dedicated to Canon EOS cameras
  • Enables shadow-free close up photography
  • Attaches to your existing lens
£139.99
Sandisk Extreme Pro SDXC UHS-1 256GB 200MB/s

Sandisk Extreme Pro SDXC UHS-1 256GB 200MB/s

In stock for home delivery, contact us for store availability
  • 256GB
  • 4k UHD
  • Up to 200MB/s read speed
£69.00
Sandisk Extreme Pro SDXC UHS-1 SD 128GB 200MB/s

Sandisk Extreme Pro SDXC UHS-1 SD 128GB 200MB/s

In stock for home delivery, contact us for store availability
  • 128GB
  • Up to 200MB/s read speed
  • 4k UHD
£38.00
Sandisk Extreme Pro SDXC UHS-1 SD 64GB 200MB/s

Sandisk Extreme Pro SDXC UHS-1 SD 64GB 200MB/s

In stock for home delivery, contact us for store availability
  • 64GB
  • 4k UHD
  • Up to 200MB/s read
£29.99
Sandisk Extreme Pro SDHC UHS-1 32GB 100MB/s
Sandisk Extreme Plus 64GB 200MB/S Micro SDXC

Sandisk Extreme Plus 64GB 200MB/S Micro SDXC

Estimated delivery time: 31 working days
  • 64GB
  • 200MB/s read and 90MB/s write
  • Included SD adapter
£18.00
Hahnel HLX-OX1 Extreme Battery 2000mah suitable replacement for Olympus BLX-1

Hahnel HLX-OX1 Extreme Battery 2000mah suitable replacement for Olympus BLX-1

In stock for home delivery, contact us for store availability
  • Lithium Ion
  • High Performance Quality Cells
  • Protection Circuit
  • 2 years warranty
  • 3m drop proof
  • Shock absorbing construction
£64.99
Opticron Explorer WA ED-R 10x32

Opticron Explorer WA ED-R 10x32

In stock for home delivery, contact us for store availability
  • 10x magnification
  • 32mm objective lens
  • Min. focusing distance 2.5Mtr.
  • Weight 430g
  • 6 Degree Field of view
£239.00
AGFA Agfaphoto Platinum AA Alkaline Batteries (4 Pack)

AGFA Agfaphoto Platinum AA Alkaline Batteries (4 Pack)

In stock for home delivery, contact us for store availability
  • PowerSealed - Holds power up to 10 yrs
  • Long lasting
  • Leak resistant
  • AA Size
  • LR6 1.5 Volts
  • MN1500
  • Pack size: 4
£3.99
Sony ECM-B10 Shotgun Microphone

Sony ECM-B10 Shotgun Microphone

In stock for home delivery, contact us for store availability
  • Compact shotgun microphone with digital signal processing
  • Choose from super-directional, unidirectional and omnidirectional pickup patterns
  • Digital audio interface via a Multi Interface (MI) Shoe
  • Comprehensive manual control for optimal sound capture
  • Cable-free and battery-free configuration for easy portability
£229.99
Tamron 17-70mm F/2.8 Di III-A VC RXD - Fuji X-Mount

Tamron 17-70mm F/2.8 Di III-A VC RXD - Fuji X-Mount

In stock for home delivery, contact us for store availability
  • Large aperture standard zoom lens
  • AI technology VC for video and stills
  • Ultra quiet Tamron RXD Autofocus motor
  • Extremely compact
  • Close focusing of just 19cm in wide angle mode
  • Moisture-Resistant Construction for added protection
  • Weight 530g
  • 67mm Filter Thread
  • Fits Fujifilm X Cameras
  • 5 year guarantee by registration
£599.00
DJI Video Transmitter

DJI Video Transmitter

Available To Order
Estimated delivery time: 10 working days
  • Wireless Video Transmitter
  • Uses DJI O3 Technology
  • Transmits 1080P/60P Footage
  • Up to 20,000 ft Range
  • Supports DFS Frequency Band
£949.00
DJI Transmission Combo

DJI Transmission Combo

Available To Order
Estimated delivery time: 10 working days
  • Groundbreaking Image Transmission System
  • 20,000ft 1080p/60fps Transmission
  • Seamless Auto Frequency Hopping
  • End-to-End Ultra-Low Latency
  • Integrated Wireless Receiver
  • Gimbal/Focus/Camera Control
  • Independent Recording and Playback
£1,979.00
BlackRapid Double Camera Harness Multi Terrain Camo

BlackRapid Double Camera Harness Multi Terrain Camo

In stock for home delivery, contact us for store availability
  • Trusted Strap Design For 1 Or 2 SLR, DSLR Or Mirrorless Cameras Places Cameras Upside-Down Against Waist
  • Allows Easy and Fast Access to Cameras
  • Separates for use as a single strap
  • Supplied with FastenR & Lockstar
£149.00
Celestron Landscout 8-24x50 Zoom Porro Binocular

Celestron Landscout 8-24x50 Zoom Porro Binocular

In stock for home delivery, contact us for store availability
  • K9 Prisms and Coated Optics - Image enhancing optical coatings for bright, color-rich views.
  • Zoom Binocular - Find your subject at low magnification then zoom in for a close-up view.
  • Adjustable Rubber Eyecups - whether you wear glasses or not, maximize your field of view by adjusting the rubber eyecups.
  • Wide field of view allows you to take in the whole scene
  • Ergonomic body - Rubber armor grip surface for extra non-slip comfort and ease of use
£54.99
Celestron Landscout 7x35 Porro Binocular

Celestron Landscout 7x35 Porro Binocular

In stock for home delivery, contact us for store availability
  • K9 prisms and coated optics - Image enhancing optical coatings for bright, color-rich views.
  • Porro prism optical design provides an enhanced 3D view of objects thanks to its widely spaced objective lenses.
  • Adjustable rubber eyecups - Whether you wear eyeglasses or not, enjoy the full field of view by folding the rubber eyecups down or leaving them up.
  • Wide field of view - Take in the whole scene at once.
  • Ergonomic body - Rubber armored, non-slip surface for extra comfort and worry-free use.
£49.00
Hahnel HL-E5 Battery for Canon cameras replaces LP-E5

Hahnel HL-E5 Battery for Canon cameras replaces LP-E5

In stock for home delivery, contact us for store availability
  • Lithium Ion
  • High Performance Quality Cells
  • Protection Circuit
  • 2 years warranty
£29.99
Nikon PROSTAFF P3 10x42

Nikon PROSTAFF P3 10x42

In stock for home delivery, contact us for store availability
  • A no-nonsense introduction to quality optics
  • 10x Magnification
  • 42mm Objective Lens
  • Field of View @ 1000M - 122m
  • Exit pupil 4.2mm
  • Min. Focusing Distance 3.0m
  • Waterproof Structure
  • Roof Prism Design
  • Weight 585g
£169.00
Nikon PROSTAFF P3 8x42

Nikon PROSTAFF P3 8x42

In stock for home delivery, contact us for store availability
  • A no-nonsense introduction to quality optics
  • 8x Magnification
  • 42mm Objective Lens
  • Field of View @ 1000M - 126m
  • Exit pupil 5.3mm
  • Min. Focusing Distance 3.0m
  • Waterproof Structure
  • Roof Prism Design
  • Weight 575g
£159.00
Nikon PROSTAFF P3 10x30

Nikon PROSTAFF P3 10x30

In stock for home delivery, contact us for store availability
  • A no-nonsense introduction to quality optics
  • 10x Magnification
  • 30mm Objective Lens
  • Field of View @ 1000M - 115m
  • Exit pupil 3.0mm
  • Min. Focusing Distance 2.5m
  • Waterproof Structure
  • Roof Prism Design
  • Weight 465g
£139.00
Nikon PROSTAFF P3 8x30

Nikon PROSTAFF P3 8x30

In stock for home delivery, contact us for store availability
  • A no-nonsense introduction to quality optics
  • 8x Magnification
  • 30mm Objective Lens
  • Field of View @ 1000M - 152m
  • Exit pupil 3.8mm
  • Min. Focusing Distance 2.5m
  • Waterproof Structure
  • Roof Prism Design
  • Weight 475g
£129.00
Nikon PROSTAFF P7 10x42

Nikon PROSTAFF P7 10x42

In stock for home delivery, contact us for store availability
  • Optical Performance Far Exceeding Expectations
  • 10x Magnification
  • 42mm Objective Lens
  • Field of View @ 1000M - 122m
  • Exit pupil 4.2mm
  • Min. Focusing Distance 3.0m
  • Waterproof Structure
  • Roof Prism Design
  • Weight 600g
£229.00
Nikon PROSTAFF P7 8x42

Nikon PROSTAFF P7 8x42

In stock for home delivery, contact us for store availability
  • Optical Performance Far Exceeding Expectations
  • 8x Magnification
  • 42mm Objective Lens
  • Field of View @ 1000M - 126m
  • Exit pupil 5.3mm
  • Min. Focusing Distance 3.0m
  • Waterproof Structure
  • Roof Prism Design
  • Weight 590g
£219.00
Nikon PROSTAFF P7 10x30

Nikon PROSTAFF P7 10x30

In stock for home delivery, contact us for store availability
  • Optical Performance Far Exceeding Expectations
  • 10x Magnification
  • 30mm Objective Lens
  • Field of View @ 1000M - 115m
  • Exit pupil 3.0mm
  • Min. Focusing Distance 2.5m
  • Waterproof Structure
  • Roof Prism Design
  • Weight 470g
£199.00
Nikon PROSTAFF P7 8x30

Nikon PROSTAFF P7 8x30

In stock for home delivery, contact us for store availability
  • Optical Performance Far Exceeding Expectations
  • 8x Magnification
  • 30mm Objective Lens
  • Field of View @ 1000M - 152m
  • Exit pupil 3.8mm
  • Min. Focusing Distance 2.5m
  • Waterproof Structure
  • Roof Prism Design
  • Weight 485g
£179.00
Celestron Starsense Explorer 10" Smartphone App-Enabled Dobsonian Telescope

Celestron Starsense Explorer 10" Smartphone App-Enabled Dobsonian Telescope

Estimated delivery time: 40 working days
  • Patented, award-winning StarSense sky recognition technology uses your smartphone to analyze star patterns overhead and calculate the telescope''s position in real-time.
  • A large 10" parabolic primary mirror with XLT coatings helps you make the most of StarSense technology. Locate faint, deep-sky objects in seconds and see them in more detail than ever before.
  • A sturdy, Dobsonian-style base with large diameter bearings and variable altitude tensioning.
  • StarSense Explorer app automatically generates a list of objects currently visible.
  • Includes a 25mm Plössl eyepiece, a 2" Crayford focuser, the StarSense smartphone dock, a StarPointer™ red dot finderscope, an eyepiece rack, and a collimation tool.
£849.00
Hahnel Procube 2 & 3 spare plate for OM System BLX-1 Battery

Hahnel Procube 2 & 3 spare plate for OM System BLX-1 Battery

In stock for home delivery, contact us for store availability
  • Procube 2 & 3 plate for OM System BLX-1 battery
£12.99
Sigma 16-28mm F2.8 DG DN | Contemporary For L-Mount

Sigma 16-28mm F2.8 DG DN | Contemporary For L-Mount

In stock for home delivery, contact us for store availability
  • L-Mount/Full-Frame Format
  • Aperture Range: f/2.8 to f/22
  • 16 elements in 11 groups
  • Minimum Focus Distance: 0.25m
  • Rounded 9-Blade Diaphragm
  • Dust and Splash-Proof Structure
  • Filer Size: 72mm
  • Weight: 450g
£778.00
Sigma 16-28mm F2.8 DG DN | Contemporary Sony E-Mount

Sigma 16-28mm F2.8 DG DN | Contemporary Sony E-Mount

In stock for home delivery, contact us for store availability
  • E-Mount/Full-Frame Format
  • Aperture Range: f/2.8 to f/22
  • 16 elements in 11 groups
  • Minimum Focus Distance: 0.25m
  • Rounded 9-Blade Diaphragm
  • Dust and Splash-Proof Structure
  • Filer Size: 72mm
  • Weight: 450g
£728.00
Sony E 15mm F1.4 G | APS-C Wide Angle Prime Lens

Sony E 15mm F1.4 G | APS-C Wide Angle Prime Lens

In stock for home delivery, contact us for store availability
  • Ultra Wide Angle APS-C Prime Lens
  • E-Mount/APS-C Format
  • 22.5mm (35mm Equivalent)
  • Aperture Range: f/1.4-f/16
  • 13 Elements in 12 Groups
  • Two Linear Autofocus Motors
  • Minimum Focus: 0.17m(MF) 0.20m(AF)
  • Rounded 7-Blade Diaphragm
  • Weight: 219g
  • Filter Size: 55mm
£699.00
Sony E 11mm F1.8 | APS-C Wide Angle Prime Lens

Sony E 11mm F1.8 | APS-C Wide Angle Prime Lens

Save £22, was £499.00
In stock for home delivery, contact us for store availability
  • Ultra Wide Angle APS-C Prime Lens
  • E-Mount/APS-C Format
  • 16.5mm (35mm Equivalent)
  • Aperture Range: f/1.8-f/16
  • 12 Elements in 11 Groups
  • Two Linear Autofocus Motors
  • Minimum Focus: 0.12m(MF) 0.15m(AF)
  • Rounded 7-Blade Diaphragm
  • Weight: 181g
  • Filter Size: 55mm
£477.00
Sony E PZ 10-20mm F4 G | APS-C Powerzoom Lens

Sony E PZ 10-20mm F4 G | APS-C Powerzoom Lens

In stock for home delivery, contact us for store availability
  • Ultra Wide Angle APS-C Powerzoom Lens
  • E-Mount/APS-C Format
  • 15-30mm (35mm Equivalent)
  • Aperture Range: f/4-f/22
  • 11 Elements in 8 Groups
  • Two Linear Autofocus Motors
  • Minimum Focus: 0.13m(W)-0.17m(T) MF
  • Rounded 7-Blade Diaphragm
  • Weight: 178g
  • Filter Size: 62mm
£686.00
Fujifilm instax LiPlay: Stone White

Fujifilm instax LiPlay: Stone White

Estimated delivery time: 31 working days
  • Produces Credit Card-Sized Prints
  • 1/5" CMOS Sensor, 2560x1920 Resolution
  • Fixed 28mm f/2 Lens (35mm Equivalent)
  • 2.7" 230k-Dot LCD Monitor
  • Bluetooth for Smartphone Operation
  • App for Printing & Adding Filters/Frames
  • Integrated Flash & Selfie Mirror
  • Audio Recording with QR Code Playback
  • Built-in battery
  • Micro SD card slot (Card sold separately)
£149.00
Fujifilm instax LiPlay: Blush Gold

Fujifilm instax LiPlay: Blush Gold

Estimated delivery time: 31 working days
  • Hybrid Digital/Instant Film Camera
  • 1/5" CMOS Sensor, 2560x1920 Resolution
  • Fixed 28mm f/2 Lens (35mm Equivalent)
  • 2.7" 230k-Dot LCD Monitor
  • Bluetooth for Smartphone Operation
  • App for Printing & Adding Filters/Frames
  • Integrated Flash & Selfie Mirror
  • Audio Recording with QR Code Playback
  • Built-in battery
  • Micro SD card slot (Card sold separately)
£149.00
Page 40 of 80
<< < 31 32 33 34 35 36 37 38 39 40 > >>
MAIN CATEGORY
 
SORT BY
FILTER BRANDS
AGFA
Arena
Atomos
Benro
Billingham
BlackRapid
Bushnell
Camouflage
Canon
Capture One
Celestron
Cinestill
Cokin
Cullmann
DJI
Duracell
Energizer
Flic Film
Fomapan
Fujifilm
Gitzo
Godox
GoPro
GPO
Hahnel
Hama
HARMAN
Hasselblad
Hawke
HIKMICRO
Hoya
Ilford
Insta360
Joby
Kenko
Kenro
Kodak
Kono!
Kood
Kowa
Langly
LCE
Leica
LensPen
Leofoto
Lexar
Lomography
Lowepro
Manfrotto
Maplin
MiLi
Misc
Nikon
NocPix
Olympus / OM SYSTEM
OpTech
Opticron
Panasonic
Peak Design
PhoneSkope
Polaroid
Rode
Rotolight
Samyang
Sandisk
Saramonic
Sigma
Slik
SmallRig
Sony
Steiner
Summit
Swarovski
Tamron
Tenba
Think Tank Photo
TTArtisan
Vanguard
Vortex
Yashica
Zeiss
Zhiyun
FILTER BY PRICE
Trustpilot
 
Follow Us
Youtube Instagram FacebookTwitterTwitter
 
Bath | Bristol | Chester | Chichester | Colchester | Derby | Exeter | Gloucester | Guildford | Hereford | Leamington Spa | Lincoln | London (Strand) | Manchester | Newcastle | Norwich | Nottingham | Oxford | Plymouth | Portsmouth | Reading | Southampton (Civic Centre) | Southampton (High Street) | Taunton | Winchester | Worcester |
London Camera Exchange Limited is company registered in England & Wales under Company Registration 02697309 and our registered office address is 15 The Square, Winchester, Hampshire, SO23 9ES. London Camera Exchange Limited is authorised and regulated by the Financial Conduct Authority and is the broker and not the lender. Our FCA registration number is 742719. London Camera Exchange Limited offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance. Credit is provided subject to affordability, age and status. Minimum spend applies. Not all products offered by Secure Trust Bank PLC are regulated by the Financial Conduct Authority.