The site is a lot bigger than you might think. Here is a full list of the pages you can find on this site, organized by menu hierarchy (get ready to scroll!):
Nikon's Z-mount Mirrorless System in Depth
- Nikon Z System News and Commentary
- Nikon Announces the Zf
- Recent Z News (August 21 — September 3)
- The Z Timeline
- The One-at-a-Time Approach
- Z8 and Z9 Firmware Updates
- Heck With the Z6 III, What About the Z10?
- Nikon Z8 Repair Update #2
- Last Week's Z News (August 13-20)
- Last Week’s Z News Shorts (Aug 7-Aug 12)
- An Update on Strap Lug Repairs
- Second Z8 Service Advisory Issued
- The Problem With Lenses
- Last Week’s Z News Shorts (July 29-Aug 6) 2
- Last Week’s Z News Shorts (July 21-28) 2
- Another Way of Looking at Z Product Launches
- F-Mount or Z-Mount?
- What’s With Z8 Camera Straps?
- What’s in the Review Queue?
- Nikon's DX Lineup is Aging Out
- More 400mm f/2.8 TC VR S Thoughts
- Firmware Updates for the Z6 and Z7 models (I and II)
- Some More About the Missing DX Cameras
- Z8 Return for Service Time (Updated)
- Why I Love the 400mm f/2.8 TC VR S
- The Nikkor Z-mount Primes
- So What’s Left Undone?
- The Nikon Z Chatter
- Service Advisory for Some Z8 Bodies
- Nervous Nellies
- And Now There Are Two
- Complete Guide to the Nikon Z8 Updated
- Nikon’s Firmware Updates Continue to Puzzle
- Did Nikon Miss An Opportunity?
- Of Warranties and Repairs
- DxO Supports New Z Products
- Z50 Gets Firmware Update
- Z8 Batteries
- Buzz Buzz?
- Nikon’s New Lens
- The Z8 “Complaints"
- The Future of the Z System Redux
- What Nikon Still Needs to Address
- Z8 Manuals and Software
- The Nikon Z8 Book (Update: It’s Available!)
- The 400mm Conundrum
- Nikon’s Marketing Problem
- The "Why It’s Not For Me" Posts
- Continued Z8 Commentary
- Z8 Presentation Clarifications
- Myths Sprout Spontaneously on the Internet
- Your Reaction May Vary
- Nikon Introduces the Z9 Light…uh…Z8
- The Comparison Between the Nikon Z7 II and Z8
- What Does the Nikon Z8 Have the Z9 Doesn’t?
- Nikon Z System Lineup Commentary
- What Does the Z9 Have the Z8 Doesn’t?
- 1.4x Works For More Things Than You Think
- I Was Wrong
- Is the Nikon Z8 the Modern D700? Not Exactly
- Ask Away. I’ve Got a Z8.
- Upcoming Nikon Z8 Presentation
- Lens Survey Says...
- What’s Thom About to Say?
- What Z-Mount Lenses Do You Really Want?
- The Best May Savings on Z Products
- RED and Nikon Put Lawyers Back in Holster
- Site Work in Progress
- Now We Have a Date and Time
- Falling Behind or Not?
- The Rumors of New Product
- New Products and Updates While I was gone
- Thom’s Taking a Short Break
- Some Common DSLR/Z Questions I Get
- DxO Adds High Efficiency Raw
- What’s Coming Next?
- Reader Questions Answered
- My Rationalized Safari Rig
- What Lenses Does Nikon Still Need? (Updated)
- The Questions No One is Asking
- Charting the Nikkors
- How Full Will the Nikon Z Lineup Get?
- Z9 Firmware 3.10 Available
- And the Latest on the Z-Mount
- Minimum Sustained Write Speed
- Is the Z-mount an Open Mount or Not?
- The Latest Refurbished Sale
- Sigma Officially Joins the Z Mount
- More Site Changes
- Z5 Gets a Firmware Update
- Z9, Third Edition
- The Zsp, Zfm, or Zf
- Third-Party Lens Support
- Zsystemuser Site Changes
- Finally, A Prayer Answered
- Is the Z3 Next?
- No Longer In Development: Two New Lenses
- The “What If” Game
- Which Lenses Are Supply Constrained?
- Z Questions Answered
- Speedlights Disappear
- Do I Need Better Than S?
- The Z50 Gets Some Firmware Love
- Cosina Production Note
- Latest Lens Info
- The Current State of Z-Mount Mid-Range Zoom
- Some Basic Z System Camera Advice
- Sorry, We Have No Sigma Today
- About Apertures
- What Did Thom Use in 2022?
- Skipping a Beat
- Two Lens Development Announcements
- 2023 Wishlist
- 2022 News/Views
- What You Said, What I Decided
- Questions for My Readers
- Full Format or Quick Format?
- How Did The Z System Do in 2022?
- It’s Cold Outside
- End of 2022 Z Lens Status
- Random Z Lens Questions Answered
- More Z Firmware Updates
- What Will Nikon Introduce at CES?
- Z9 Service Advisory
- Is There a System to the Z Mount?
- Z System Holiday Advice
- What's the Best Telephoto Option?
- Nikon Sales Continue to do Well
- Nikon Announces Changes to Their Cosmetics
- Questions for Nikon
- The Z9 Gets a Grip
- The 600mm f/4 Finally Appears
- Another Z6 II and Z7 II Firmware Update
- Bug or No Bug?
- The World Cup Question
- What's Happening with the Z9?
- Z9 Firmware Update
- Z50, Z6, and Z7 Firmware Updates
- Nikon October Savings Still Active
- Nikon Mount Licensing
- Z9 Logjam Broken
- Who Is Nikon's Customer?
- Did Nikon Make a Mistake?
- The Nikon Lens Road Map Tells Us Something
- The Latest Trickle
- Survey Says...
- Good Grief, Charlie Brown
- Good News or Bad News?
- What Does the Lens Line Need?
- The Z-Mount Tax
- What Does a Z7 III Need?
- Understanding Z Product Management
- Welcome Tamron, Seriously*
- Are Extra Mounts Bad?
- Show Me the Pixels
- What Would Third Party Lenses Provide Us?
- Third-Party Autofocus on the Z-mount
- What Does a Z50 II Need?
- What Does a Z6 III Need?
- Telephoto Options Round Two
- The Rumors (or Not)
- Does Nikon Owe You a Firmware Update?
- Telephoto Questions Abound
- Will We Get Another Z-Mount Road Map?
- Get Ready: We're in the Second Half
- Demand Versus Supply
- Price Increases Coming
- Z9 Firmware 2.10 Available
- Z30 Versus ZV-E10
- The Canon R7 Shows Nikon Has Some Work To Do
- Nikon's Fraternal Triplets Aren't the Answer
- Sarcasm: Nikon's DX Plan
- Nikon Announces the Unexpected/Expected Camera
- The Log Jam at 400mm
- Site Updating
- What's Needed to Stay Competitive?
- DSLR versus Mirrorless Focus Differences
- Z9 Bits and Pieces
- What Cameras Are There Room For?
- What is Urgently Needed?
- Learn, Practice, and Master
- RED Sues Nikon Over Z9 RAW Video Patent
- Canon R7 Envy
- Complete Guide to the Nikon Z9 Updated
- NikonUSA Brags About Z9 Sales
- Reader Questions Answered
- Learning Isn't Exactly Perfect
- Where's The Weak Spot in Nikon's Full Frame Lineup?
- What is Synchro VR?
- April Firmware Updates
- May Z Rebates
- Nikon Announces the 800mm f/6.3 PF
- Another Look at Z 2022
- Nikon Marketing's Accurate Wording
- CFexpress Card Notes
- Some Brief Z Comments
- When Will You Get Your Z9?
- CP+ Z-Related Commentary
- Commentary on the News
- Will Nikon Announce Something for CP+?
- Just in the Nick of Time...
- I'm Feeling a Buzz Coming On
- Z9 Firmware Update
- Which Mid-Range Zoom for You?
- Z7 II Firmware Update
- Nikon Launches the 400mm f/2.8
- Zfc Gets a Firmware Update
- Which Z Camera Will Be Next?
- What You Want in Future Lenses
- Z9 NPS Shipments
- Even Execs Like to Overstate Things
- First Z9 Firmware Update
- Nikkor Rumblings
- Random Z9 Notes
- Volume is not Equal to Success
- More Misinformation, Disinformation, and Misquoting
- The Latest on the Z9
- Some Comments on Z9 Commentary...
- 2021 News/Views
- I’m Back
- I'm Such a Tease...
- Which to Buy? Z5 or Z50?
- How Does the Z9 Live View Work?
- "Electronic" Shutter
- When Will We See Sigma and Tamron Lenses?
- Want to Master Nikon Z Focusing?
- Why is the Z9 Going to Sell Out?
- The Z System Holiday Buying Primer
- Ask Again Later...
- Nikon Late November Savings
- The Sniping Begins...
- Firmware, Software, Info Updates Continue
- May You Live in Interesting Times
- Still More Questions Asked and Answered
- The Possibilities Ahead
- Nikon Z-Mount Lens Sale
- Presentation Reminder
- Winners and Losers
- A Simple DX Thought
- The New World of Nikon Software
- The Unanswered Z9 Questions
- The Z9 is Announced
- New Z System Lens Road Map Revealed
- The Last Gasp of Brand Loyalties
- FX Lens Recap
- Teaser Three
- Firmware Updates for the Z6 II and Z7 II
- More Random Questions Answered
- The Lack of a DX Road Map
- Teaser Two with a Slice of DX
- Some Random Z Questions Answered
- What Do I Want in a Z50 II?
- And the Turbulence Begins...
- Fasten Your Seatbelts. Turbulence Ahead.
- The Strange Case of the EN-EL25
- 14-200mm is not Enough
- When Will the Dam Break?
- Catching up With Sony
- Is the Zfc "Fun"? Is it Selling?
- Z Tidbits in Nikon's 2021 Report
- Nikon Update Status
- Comments from Site Readers
- Full Frame Z Users Biggest Complaint
- How to Make Nikon Users Happier (fall 2021 edition)
- Thom's Been Busy as a Zee
- The Professional's Dilemma
- So What Do I Really Think of the Z System?
- A Z9 Does Appear to be at the Olympics
- Thom's Z Olympics Explainer
- Another Legacy Lens Gets its Moment
- Followup on Upcoming Z Products
- Zfc Release Schedule
- The Latest on Upcoming Z Bodies
- Another Zfc Comment
- A Quick Setup Tip
- New Firmware Updates
- What Are the Next Nikon Z Cameras?
- One Last Take on the Zfc Launch
- Zfc Lens Irony
- Here Comes Another Round of Guessing
- Did Nikon Just Provide a Z9 Focusing Clue?
- EH-7P no Longer Comes with Z7 Models?
- I’m Confused
- Nikon Launches a New DX Z Camera
- Zfc Questions and Answers
- Rebuzz, Rebuzz
- The Pastel Panda
- The Fujifilm/Nikon Duel is On
- What Are We Still Waiting For?
- Three Small Firmware Updates
- Nikon's Dilemma
- Two New Lens Patents
- The Z50 is Last?
- Retro to the Future
- What's With Development Announcement of Compact Lenses?
- Missed it by That Much...
- New Nikon Macro Lenses
- Flagship Bodies? 30 Lenses by End of Year?
- What To Expect
- No, Nikon is Not Sleeping
- The Latest Discounts
- Mythbusting
- The Firmware Update Details
- Where is the Z System Heading?
- Nikon Preannounces Firmware Updates
- The Spring Z Sale
- So What Would a Z8 Be Like?
- Lens Firmware Updates: 20mm and 85mm f/1.8
- What the Z9 Needs to Satisfy
- Why I Don't Put Much Credence in BCN Market Share Numbers
- The Z6 II and Z7 II Complete Guide is Here
- About that Asterisk
- Another Thought on the Z9
- Cat is Out of the Bag — Z9 Development Announcement
- Who Will Make Nikon's Next Sensor?
- Upon Reflection
- Nikon Opens Up (a bit)
- All Z News Fit to Print
- Nikon Quiet at CP+
- No CP+ Launches?
- Z6 II and Z7 II Firmware Update
- Some Nikon "Answers"
- The Mythical Z30
- Record Quarterly Sales for Mirrorless Cameras
- Paranoia Followup
- For Those With Sony Paranoia
- What Does II Say About III?
- What Lens? Poll Results
- What Lenses Do You Really Want?
- The "What Lens" Question
- What Card Should You Get?
- The Random Firmware Gods
- Z Stock Update
- Did Nikon Make a Mistake?
- The Sadder Case of the MB-N11
- 2021: Likely Z Gear Versus Wanted Z Gear
- 2020 News/Views
- Tips for New Z System Users
- When, When, When?
- You Requested This
- More Firmware Updates
- Site Inactive Until 2021
- Firmware Update for the II Models
- What Nikon Hasn't Talked About
- So What's Still Missing?
- A Potential Critical Nikon Mistake
- The Story With Only a Middle
- New Photo Shows Lens Sizes
- Z6 II Firmware Update
- Black Friday? More Like Lack Friday
- Reminder for New Z Users
- The Travel Kit Late 2020
- The Complete Guide to the Z6 and Z7, Third Edition
- Firmware Update for 24-70mm f/2.8 S
- Latest Z Instant Savings
- Are the Z6 and Z7 Still Viable?
- Z5 Gets a Minor Firmware Update
- How to Get Around Nikon's Nanny-ing
- My Tolerance for Tolerances Has Gone Down
- Some Z Lenses Get Instant Rebates
- We Need Subject Tracking as a Separate AF Area Mode
- What Does Thom Want From Nikon?
- Funny How Opinions Don't Always Match Specs
- Questions That Haven't Been Answered
- Firmware Updates for the Z6, Z7, and Z50
- So What Are the New Complaints?
- Nikon Announces the Next Chapter (Z6 II and Z7 II)
- The Not Quite Yellow Program
- So Why is the Z5+24-200mm Out of Stock?
- The Yellow Program is Back
- Lots of Speculation, Few Answers
- A Surprise For Nikon
- A Countdown Timer is Not Marketing
- The Firmware Fumble
- Keep Those Lens Responses Coming!
- And Here's Your Answer
- Do You Want Another Wide Angle Zoom?
- Thoughts on the IIs
- Firmware Updates
- The Countdown Begins
- Z System Miscellany
- How Many Nikon Z's Have Been Sold?
- The 2020 Z Lens Lineup is Complete
- A Nikkor Z Lens Design Interview
- An Un-bashing
- Small Bites of Z News
- Z System Shipping Status
- Changes in Settings on the Z5 and Z6
- The Z5 Manual is Available
- How Opinions Get Formed
- Hmm. A Little FUD From Panasonic
- EISA Awards
- Nikon No Kan-do
- Nikon Scores Own Goal
- Latest Site Additions
- Z System Converted to InfraRed
- Site Expansion Continues
- Ship Dates for New Z Products
- Why Would We Want Pixel Shift?
- The Z5 Trade-in Deal
- New on the Site
- Your Thoughts on Nikon Z
- The Bar Has Been Raised
- The Z50 Gets a Discount
- Nikon Maps Needs to Upgrade ;~)
- Nikon Autofocus Patent
- Another Way To Think About Z
- Nikon Compares Z7 Design to Toyota Supra
- The Pressures on Nikon
- How Does the Different Z5 Sensor Impact Autofocus?
- Answer from Nikon
- What Did Nikon Expect?
- 24-50mm or 24-200mm?
- Some Notes About the Z System User Site
- Really? What Logic Drives This?
- Comments About Today's Announcements
- More Firmware Updates for Z System (Updated)
- The Current Z Discount Situation
- Nikon Goes Low with the New Z5
- Welcome to Z System User
- Z-Mount Cameras
- Nikon Z Camera Reviews
- Z Camera Database
- Z Camera Articles
- The Z9 in Africa Blog
- Day Twelve — Wrapping Up
- Day Eleven — Pairs
- Day Ten — Thom Starts Dragging (the shutter)
- Day Nine — Moving On
- Day Eight — Follow the Dogs (Literally, and with Focus)
- Day Seven — Persistence Means What?
- Day Six — Birds in Flight
- Day Five — Testing Under Water
- Day Two — Some Background
- Day One — First Impressions
- A Nikon Z Mirrorless Safari
- Reader Questions About the Nikon Z5
- Reader Questions About the Nikon Z6 & Z7
- Reader Questions About the Z50
- Reader Questions About the Z8
- Reader Questions About the Nikon Z9
- Smaller and Lighter, or Not?
- Comparing Nikon Z to Sony A
- Recommended Z50 Kit
- Thom's Zfc Quick Advice
- The Z System Wish List
- How to Use a Z as a Webcam (Streaming)
- Z System Upgrade Advice
- Camera Warranties and Repairs
- The Z9 in Africa Blog
- Z-Mount Lenses
- Nikkor Lenses
- Z-Mount Lens Articles
- Nikon Z Mount Lens Road Map
- Nikon Z-Mount FX Lens Reviews
- Nikon 20mm f/1.8 S Lens Review
- Nikon 24mm f/1.8 S Lens Review
- Nikon 28mm f/2.8 Lens Review
- Nikon 35mm f/1.8 S Lens Review
- Nikon 40mm f/2 Lens Review
- Nikon 50mm f/1.2 S Lens Review
- Nikon 50mm f/1.8 S Lens Review
- Nikon 50mm f/2.8 Macro Lens Review
- Nikon 85mm f/1.8 S Lens Review
- Nikon 105mm f/2.8 Lens Review
- Nikon 14-24mm f/2.8 S Lens Review
- Nikon 14-30mm f/4 S Lens Review
- Nikon 17-28mm f/2.8 Lens Review
- Nikon 24-50mm f/4-6.3 Lens Review
- Nikon 24-70mm f/2.8 S Lens Review
- Nikkor 24-70mm f/4 S Lens Review
- Nikon 24-120mm f/4 S Lens Review
- Nikon 24-200mm f/4-6.3 Lens Review
- Nikon 28-75mm f/2.8 Lens Review
- Nikon 70-180mm f/2.8 Lens Review
- Nikon 70-200mm f/2.8 S Lens Review
- Nikon 100-400mm f/4.5-5.6 Lens Review
- Nikon 400mm f/2.8 S TC VR Lens Review
- Nikon 400mm f/4.5 Lens Review
- Nikon 800mm f/6.3 PF VR S Lens Review
- Nikon Z-Mount DX Lens Reviews
- Current Zoom FX Nikkors
- Nikkor Zoom Lens Optical Designs
- Nikkor Z 14-24mm f/2.8 S
- Nikkor Z 14-30mm f/4 S
- Nikkor Z 17-28mm f/2.8
- Nikkor Z 24-50mm f/4-6.3
- Nikkor Z 24-70mm f/2.8 S
- Nikkor Z 24-70mm f/4 S
- Nikkor Z 24-120mm f/4 S
- Nikkor Z 24-200mm f/4-6.3 VR
- Nikkor Z 28-75mm f/2.8
- Nikkor Z 70-180mm f/2.8
- Nikkor Z 70-200mm f/2.8 VR S
- Nikkor Z 100-400mm f/4.5-5.6 VR S
- Nikkor Z 180-600mm f/5.6-6.3 VR
- Current Prime FX Nikkors
- Nikkor Prime Lens Optical Designs
- Nikkor Z 20mm f/1.8 S
- Nikkor Z 24mm f/1.8 S
- Nikkor Z 26mm f/2.8
- Nikkor Z 28mm f/2.8
- Nikkor Z 35mm f/1.8 S
- Nikkor Z 40mm f/2
- Nikkor Z 50mm f/1.2 S
- Nikkor Z 50mm f/1.8 S
- Nikkor Z MC 50mm f/2.8 Macro
- Nikkor Z 58mm f/0.95 NOCT S
- Nikkor Z 85mm f/1.2 S
- Nikkor Z 85mm f/1.8 S
- Nikkor Z MC 105mm f/2.8 VR S Macro
- Nikkor Z 400mm f/2.8 TC VR S
- Nikkor Z 400mm f/4.5 VR S
- Nikkor Z 600mm f/4 TC VR S
- Nikkor Z 800mm f/6.3 PF VR S
- Current DX Nikkors
- Lenses with Firmware Updates
- Where Are Z Lenses Made?
- Third-Party Lenses
- Reviews of Third Party Z Lenses
- 7Artisans 60mm f/2.8 Macro Lens Review
- Laowa 9mm f/2.8 Dreamer Lens Review
- Laowa 25mm f/2.8 Macro Lens Review
- Meike 25mm f/1.8 Lens Review
- Meike 50mm f/1.7 Lens Review
- Opteka 420-800mm Lens Review
- Tamron 70-300mm f/4.5-6.3 Lens Review
- TTArtisan 11mm f/2.8 Fisheye Lens Review
- Viltrox 23mm f/1.4 Lens Review
- Viltrox 56mm f/1.4 Lens Review
- Viltrox 85mm f/1.8 Lens Review
- Voigtlander 40mm f/1.2 Lens Review
- Voigtlander 65mm f/2 Macro Lens Review
- Third Party Autofocus Lenses
- Third Party Manual Focus Lenses
- Artralab Lenses
- Astrhori Lenses
- 7Artisans Lenses
- Funleader
- Irix Lenses
- KamLan
- Kipon Lenses
- Laowa Lenses (Venus Optics)
- Laowa 4mm f/2.8 Fisheye
- Laowa 7.5mm t/2.9 Zero-D
- Laowa 9mm f/5.6 FF RL
- Laowa 9mm f/2.8
- Laowa 10mm f/4
- Laowa 10-18mm f/4.5-5.6
- Laowa 11mm f/4.5 FF RL
- Laowa 12mm f/2.8
- Laowa 12-24mm f/5.6
- Laowa 14mm f/4 Zero-D
- Laowa 15mm f/2 Zero-D
- Laowa 15mm f/4.5 Zero-D Shift
- Laowa 20mm f/4 Zero-D Shift
- Laowa 24mm f/14 Macro Probe
- Laowa 25mm f/0.95 Argus APO
- Laowa 25mm f/2.8 Macro 2.5-5x Ultra
- Laowa 28mm f/1.2 Argus
- Laowa 33mm f/0.95 Argus
- Laowa 35mm f/0.95 Argus
- Laowa 58mm f/2.8 Dreamer 2x APO Macro
- Laowa 65mm f/2.8 Ultra-Macro APO
- Laowa 85mm f/5.6 Macro APO
- Laowa 90mm f/2.8 CA-Dreamer Macro 2x
- Laowa 100mm f/2.8 Macro
- Lomography
- Meike Lenses
- Meyer-Optik-Goerlitz
- Mitakon Lenses
- Nisi
- Opteka Lenses
- Pergear Lenses
- Rockstar
- Samyang Lenses
- Sirui
- Tokina
- TTArtisans Lenses
- TTArtisans 7.5mm f/2 Fisheye
- TTArtisans 11mm f/2.8
- TTArtisans 17mm f/1.4
- TTArtisans 21mm f/1.5
- TTArtisans 23mm f/1.4
- TTArtisans 25mm f/2
- TTArtisans 35mm f/1.4
- TTArtisans 40mm f/2.8 Macro
- TTArtisans 50mm f/0.95
- TTArtisans 50mm f/1.2 MF
- TTArtisans 50mm f/1.4 MF
- TTArtisans 50mm f/2 MF
- TTArtisans 100mm f/2.8 Macro
- Viltrox Lenses
- Voigtlander (Cosina)
- Voigtlander 15mm f/4.5 Super Wide-Heliar
- Voigtlander 23mm f/1.2 Nokton
- Voigtlander 35mm f/1.2 Nokton
- Voigtlander 35mm f/2 APO-Lanthar
- Voigtlander 35mm f/2 APO-Ultron Macro
- Voigtlander 40mm f/1.2 Nokton
- Voigtlander 50mm f/1 Nokton
- Voigtlander 50mm f/2 APO-Lanthar
- Voigtlander 65mm f/2 Macro APO-Lanthar
- Zhongyi Optics
- Reviews of Third Party Z Lenses
- Adapters & Converters
- Tripod Collars and Feet
- Nikkor Lenses
- Accessories
- Z Accessory Reviews
- Z Accessories
- Versions of Nikon Software For Z System
- Thom's Z-mount Bags
- Nikon Z System Books
- Complete Guide to the Nikon Z5
- Complete Guide to the Nikon Z6 and Z7
- Complete Guide to the Nikon Z6 II and Z7 II
- Complete Guide to the Nikon Z8 Book
- Complete Guide to the Nikon Z9 Book
- Complete Guide to the Nikon Z50
- Configuring and Using the Nikon Zfc
- Z8GUIDE100toc.pdf
- byThom Books FAQ
- Are your books just rewrites of the manual?
- Why can't I find your works in bookstores?
- Why can't I find your works in the Kindle (Nook, Apple, Android) store?
- Do you ever update your works?
- What do your books work on?
- Can I copy the eBook file to my other computers?
- What Happens if I Lose my Downloaded File?
- About Z System User
