This list is truly disgusting--the confession of one who buys and never sells.
Canon EF
Canon 5D Mark II
Canon 5D
Canon 10D
Canon EOS Elan IIe
Sigma 12-24 EX DG
Sigma 14/3.5
Zenitar 16/2.8 Fisheye with integral EF adapter
Canon 20-35/3.5-4.5 USM
Canon 24/3.5L Mark I TS-E
Canon 24-105/4L
Schneider 28/4 Curtagon with M42 Adapter
Sigma 28-70/2.8 EX
Canon 50/1.4 USM
Canon 50/2.5 Compact Macro
Nikon 55mm AI Micro-Nikkor, on PB-4 bellows with slide adapter, for making dupes
Canon 70-200/4L
Canon 85/1.8 USM
Jupiter 85/2 with AF-Confirm M42 Adapter
Tamron 90/2.5 SP Macro with AF-Confirm Adaptall EF Adapter
Phoenix 100-400 Zoom (Gawd help me)
Nikon 105/2.5 AI Nikkor with AF-Confirm Adapter
Canon 135/2.8 Soft Focus
Carl Zeiss Jena 135/3.5 with AF-Confirm M42 Adapter
Nikon 180/2.8ED AIS Nikkor with AF-Confirm Adapter
Takumar 500/4.5 with M42 Adapter
Canon 1.4x Teleconverter
EF-Adaptable Medium Format
Pentacon Six-mount Cameras:
Exakta 66 Mk.III
Pentacon Six TL
Kiev 60 (three of them)
Kiev 88CM, with custom titanium shutter, black finish, and leather covering by Arax
Pentacon Six mount to EF adapter
Pentacon Six mount to EF adapter with focus confirmation
"Hartblei" (not really) Pentacon Six to EF adapter with up to 10 degrees of tilt
Pentacon Six mount lenses (all adaptable to EF and to Pentax 645):
Arsenal 30/3.5 Arsat Fisheye
Hartblei 45/3.5 PCS shift lens (becomes tilt/shift on EF with tilting adapter)
Arsenal 45/3.5 Mir 26
Carl Zeiss Jena 50/4 MC-Flektogon (two of these)
Arsenal 55mm Arsat PCS shift lens (becomes tilt/shift on EF with tilting adapter)
Arsenal 65/3.5 Mir 38
Arsenal 80/2.8 Arsat (four of these)
Carl Zeiss Jena 80/2.8 MC-Biometar
Arsenal 90/2.8 Vega
Arsenal 120/2.8 Vega
Carl Zeiss Jena 180/2.8 Sonnar
Carl Zeiss Jena 180/2.8 MC-Sonnar
Carl Zeiss Jena 300/4 MC-Sonnar
Pentacon 500/5.6 Prakticar-MC
Arsat 2x Teleconverter
Pentacon Bellows
Arsat Extension Tubes
Non-EF 35mm Film Cameras
Canon F-1
Canon T-90
Canon TX
Samyang 18-28 (FD mount)
Canon 24/2.8 (FD)
Canon 35/3.5 (FL)
Canon 50/1.4 (FD)
Vivitar (Tokina) 75-260/4.5 Zoom (T4-FD mount)
Canon 80-200/4 (FD)
Canon 100-300/5.6 (FD)
Canonet 28
Fed 3 (Leica Thread Mount)
Fed 5
Turret finder
Leica adjustible finder
KMZ 35/3.5 Jupiter
KMZ 50/2.8 Industar
KMZ 85/2 Jupiter
Leitz 90/4 Elmar (pre-war, uncoated)
Komura 135/2.8
Canon Adapter L (FL/FD lens to Leica Thread Mount)
Nikonos II
35mm Nikkor-UW
Sea-and-Sea 16mm Wide-Angle Converter
Nikon EM (lenses adaptable to EF)
Nikon 35/2.8 Series E
Nikon 50/1.8 Series E
Nikon 75-150/3.5 Series E
Commercial Medium Format
Pentax 645z
Pentax 645N
Pentax 645NII
Pentax 645 35/3.5 FA
Pentax 645 45-85 FA zoom
Pentax 645 55/2.8 D-FA AL AW SDM
Pentax 645 75/2.8 Leaf Shutter
Pentax 645 80-160 FA zoom
Pentax 645 120/4 Macro
Pentax 645 150/2.8 FA
Pentax 645 200/4 FA
Pentax 645 300/4 A* ED(IF)
Pentax 645 400/5.6 FA ED(IF)
Pentax 645 A 1.4x teleconverter
Pentacon Six to Pentax 645 Adapter
Pentax 67 with TTL prism
Pentax 6x7 MLU with TTL prism
Pentax 6x7 MLU with standard prism
Pentax SMC Pentax 35mm Fisheye
Pentax SMC Pentax 45/3.5
Pentax SMC Pentax 55/4
Pentax SMC Takumar 75/4 Shift
Pentax SMC Takumar 105/2.4
Pentax SMC Takumar 135/4 Macro
Pentax SMC Takumar 200/4 (old style)
Pentax SMC Pentax 200/4 (new style)
Pentax SMC Pentax 300/4
Mamiya C-3
Mamiya C-33
Mamiya C-330 ProS
Mamiya/Sekor 55/4.5
Mamiya/Sekor 80/2.8
Mamiya/Sekor 135/4
Misc. Medium Format
Moscow V Folding 6x9 camera
Rolleiflex 3.5 MX Type II, with 75mm Schneider Xenar
Yashica 635 (in terrible condition)
Large Format
SINAR P 4x5 View Camera
--SINAR P Expert Kit
SINAR F+ 4x5 View Camera
--F2 front standard
--Norma multipurpose standard (for extending the bellows)
--F multipurpose standard (as a backup)
--Graflok GG back with Maxwell Hi-Lux Screen
--Fresnel (not needed with above)
--Standard bellows (two sets)
--Compendium lens shade support (for one of the standard bellows)
--Bag bellows
--Wide Angle Bellows II
Cambo SC 4x5 View Camera
--Graflok GG back with Fresnel
--Standard Bellows
--Bag Bellows
--Compendium lens shade
Graflex Speed Graphic, Top-Rangefinder Pacemaker model with additional Kalart side rangefinder
Travelwide 65
Travelwide 90
Graflex 6x7 rollfilm back (Graflok)
MPP 6x9 rollfilm back (Graflok)
Wista 6x9 rollfilm back (Graflok)
Shen-Hao 6x12 rollfilm back (Graflok)
Sinar Vario rollfilm holder (Slide-in)
Fuji Quickload holder (a Polaroid 545, too, good as a doorstop)
Fuji PA-45 4x5 pack-film holder (for Fujiroid pack film)
Schneider 47/5.6 Super Angulon in Compur shutter
Schneider 65/5.6 Super Angulon in Copal shutter
Schneider 65/8 Super Angulon in Prontor Press shutter (in Travelwide 65)
Schneider 90/5.6 Super Angulon in Copal shutter
Graflex Optar WA 90/6.8 (for Speed Graphic, in Travelwide 90)
Schneider 121/8 Super Angulon in Compur shutter
Graflex Optar 127/4.5 (for Speed Graphic)
Rodenstock 150/6.3 Geronar in Copal shutter
Schneider 180/5.6 (and 315/12) Symmar Convertible in Compur shutter
Rodenstock 210/5.6 Sinaron-S (APO-Sironar-N) in Copal shutter
Ilex 8-1/2"/4.5 Paragon in Ilex Universal shutter (for Speed Graphic)
Calumet Caltar 240/6.8 Type Y (Rodenstock Ysarex) in Copal shutter
Calumet Series 1 Caltar 12"/6.3 (Ilex-made) in Acme shutter
Calumet CC-400 View Camera
Light Meters
Sekonic L-718
Minolta Spotmeter F (deceased)
Pentax Spotmeter V (with Zone VI scale)
Gossen Luna Pro
Vivitar Model 43
Sekonic L-58
Tripods
Gitzo 3532 Mountaineer
Bogen 3046 legs (Manfrotto 028 )
Bogen 3036 legs (Manfrotto 075 ) (two sets)
Bogen 3011 legs (Manfrotto 055XD)
Bogen 3001 legs
Manfrotto 055CXPro legs
Bogen 3039 head (Manfrotto 229)
Manfrotto 410 Junior Geared Head
Arca-Swiss Monoball (Original style)
Arca-Swiss B1
Sinar Tilt Head (broken)
Sinar Tilt Head (not broken)
No-name gimbal head (two of these; excellent Asian ripoff of Kirk King Cobra)
Several more Bogen 3-way heads (mostly retired)
More L-plates, lens plates, and camera plates than you can shake a stick at
Monostat monopod
Gitzo monopod
Lighting
Canon 580EX Speedlight
Canon 550EX Speedlight
Pentax AF540FGZ (2)
Vivitar 283 (three of these, with high-voltage belt pack)
Sunpak 611 (with high-voltage belt pack)
Sea-and-Sea underwater flash
Speedotron D1604 Power Supply
Speedotron MW3R Light Unit (two, with 5.5" reflectors, barn doors, and snoots)
Speedotron M11 Light Unit (two, with 7", 11" reflectors, barn doors, and snoots)
Stroboframe Bracket
Stroboframe QuickFlip (three)
48" Shoot-Through umbrella
6'x6' scrim
Reflectosol 36" reflector umbrella (two)
36" reflector umbrella (two)
36" softbox
light stands (four)
Digital Darkroom
DXO Photolab
Affinity Photo (as a back to PS)
Adobe Photoshop CC
Breezebrowser Pro
Vuescan Professional (scanning software)
Nikon Super Coolscan 9000ED (medium format, with glass carrier)
Nikon Super Coolscan 8000ED (in need of repair)
Epson V750 Pro flatbed scanner (for large format)
Benq SW2700PT Monitor
Gretag/Macbeth EyeOne monitor calibration system
Wolf Faust IT8 targets for fully profiled scanners using Vuescan
Epson 3800 (stunning, still going strong)