A trinocular stereo microscope is really a three-variable equation: magnification, working distance and field of view move together, and the camera port is a fourth choice stacked on top. This guide works through every published configuration of the No.7050-B3 — the 7X–50X trinocular stereo zoom microscope supplied with a 0.5X CTV camera adapter — and shows which eyepiece and auxiliary-lens pairing matches which bench task, so the configuration you quote is the one your technicians actually need.
Three numbers decide whether a bench task feels comfortable or cramped. On a stereo zoom body they cannot be adjusted independently, and knowing which way each one moves saves a wrong purchase.
Working distance is the clear air between the bottom of the objective and the top of the workpiece — the space an iron tip, a pair of tweezers or a technician's fingers actually occupies. Field of view is how much of the board is visible at once at a given zoom setting. Magnification is how much detail sits inside that field.
Add an auxiliary lens in front of the objective and all three change at once. A lens that buys clearance also lowers magnification and widens the view; a lens that multiplies magnification also eats clearance and narrows the view. The eyepiece does the same job from the other end: the 22mm eyepiece favours the wider view, the 10mm eyepiece favours higher magnification, and neither of them changes the working distance.
That is why a microscope set up for reworking a connector can feel impossible on a 0402 pad — the task changed, not the optics. Use the directional table below to decide which way to move, then read the exact published numbers for every combination in the configuration matrix that follows.
| If your bench needs… | Move toward… | Why it works |
|---|---|---|
| Clearance for an iron tip, hot-air nozzle or tweezers | 0.5X auxiliary lens | Working distance grows from the standard setting to the longest in the range. |
| A whole board section in one view | 0.5X auxiliary lens with the 22mm eyepiece | Lower magnification widens the field of view to the broadest published value. |
| Finer detail on a trace, pad or solder joint | 2X auxiliary lens with the 10mm eyepiece | Highest magnification with the narrowest field — detail over context. |
| More magnification without spending clearance | 10mm eyepiece, standard configuration | The eyepiece raises magnification while working distance stays where it was. |
| More clearance and more magnification together | 0.5X auxiliary lens with the 10mm eyepiece | Splits the difference — mid-range magnification at extended reach. |
| A wider view at the same magnification | 22mm eyepiece | Wider eyepiece, wider field, same lens stack in front of the objective. |
This table gives direction only. The exact magnification, field-of-view and working-distance values for each configuration are listed in the matrix below.
Every number the No.7050-B3 publishes, arranged so a buyer can read across an eyepiece and down a lens. Working distance belongs to the column, not the row — the lens in front of the objective sets it.
| Eyepiece | Standard configurationWorking distance 100 mm | Auxiliary lens 0.5XWorking distance 165 mm | Auxiliary lens 2XWorking distance 30 mm |
|---|---|---|---|
| Working distance | 100 mm | 165 mm | 30 mm |
| WF10X/22mm | 7x – 50x Field of view 4.4 – 31.4 mm The default working setup: full-board context with 100 mm of clearance. | 3.5x – 25x Field of view 8.8 – 62.8 mm Widest view on the page — a whole board section in one look, with the longest clearance. | 14x – 100x Field of view 2.2 – 15.7 mm High magnification retained with the wide eyepiece, but only 30 mm above the work. |
| WF10X/10mm | 14x – 100x Field of view 1.0 – 7.1 mm Detail over context: double the magnification at the unchanged 100 mm clearance. | 7x – 50x Field of view 2.0 – 14.2 mm Long-reach detail work — the standard magnification carried out to 165 mm. | 28x – 200x Field of view 0.5 – 3.5 mm The finest inspection point in the range, for traces and bonds rather than boards. |
Values transcribed from the No.7050-B3 specification sheet. Magnification and field of view are quoted as published pairs; working distance applies to the lens column.
Four common electronics tasks, worked backwards from the constraint a technician actually feels to the exact matrix cell that answers it. Use these as the shortcut when the matrix feels abstract.
Profile A
The 10mm eyepiece doubles magnification without spending any of the working distance, so clearance and detail both survive.
Profile B
Clearance is the one variable the eyepiece cannot fix, so the lens step comes first; then choose the field with the eyepiece (8.8 – 62.8 mm with the 22mm, 2.0 – 14.2 mm with the 10mm).
Profile C
The widest field and the longest clearance in the same configuration — the fastest way to sweep a batch before individual parts get a closer look.
Profile D
The highest magnification the microscope publishes, traded openly against clearance — a sit-still inspection station rather than a rework bench.
The vertical port is the most misunderstood part of the specification. It changes how the work is shared, not how it is seen.
The port on top of the viewing head is a separate light path. It does not change what the eyepieces show: magnification and field of view stay exactly as the matrix above lists them, at every lens and eyepiece combination.
What it adds is a way to put the same image on a screen — a shared view for a second technician, a before-and-after record of a reworked joint, or a reference image for a training file. That is the difference between a microscope that one person uses and a microscope a team can standardise on.
The No.7050-B3 ships with a 0.5X CTV lens adapter, so the camera decision can be deferred. A camera can be added later without replacing the head or re-buying the optics.
The decision rule: if only one person will ever look down the eyepieces, the optical job is the same either way. If anyone else needs to see the work — a supervisor signing off, a customer receiving a repair report, a new technician learning a technique — configure the trinocular body now and treat the camera as a later purchase.
Optics set what a technician can see; the head, the light and the base set how long they can keep seeing it. These are the parts of the specification that show up in a shift pattern.
45-degree inclined viewing head. Looking down at an angle rather than straight down keeps the neck neutral across a full shift. On a bench where the same person works for six hours, this is the difference between a tool that stays in use and one that gets pushed aside.
360-degree lens module rotation. The lens module can be swung freely on the bracket assembly, so the optics move away from the workpiece instead of the workpiece moving away from the optics. Fixtures, jigs and wired assemblies stay exactly where they were set.
LED ring light and dust-proof lens. Shadow-free illumination, low energy consumption and a long service life, with a protective lens keeping swarf and flux spatter off the front element — a small detail that protects image quality over years of bench use.
Large-range metal loading base. A stable, wide metal plate that supports larger boards and fixtures without rocking, so a technician can set up once and inspect a whole run in the same position.
Four decisions define the unit that arrives. Settle them before requesting a quote and the pricing conversation takes one round instead of three.
WF10X/22mm for general board work with the wider field, or WF10X/10mm when the bench needs the higher magnification band. Working distance is unchanged by this choice.
None for standard 100 mm clearance, 0.5X for the 165 mm reach, or 2X when magnification matters more than room above the board.
The 0.5X CTV adapter is part of the microscope, so the port is ready either way. Name the camera pairing in the enquiry if you want one quoted together with the optics.
A single bench and a multi-site rollout are different quotes. Say how many stations you are equipping so a repeatable, consistent configuration can be quoted in one go.
A quote is only useful if it matches the bench. Send the eyepiece, the auxiliary lens, whether a camera should be included, the number of stations and the destination — the reply comes back priced against that build rather than a generic unit.
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