Surface Figure
Surface form tested by interferometry — PV/RMS values from the actual measurement.
OEM Make-to-Print · Rod Lenses
Rod Lenses for Slim Rigid Scopes — Φ1.19–1.96 mm, per drawing
At Φ1.19 mm, a few arc-minutes of centration error moves the image noticeably. We measure centration per ISO 10110-6 and record values on the batch COA. Send the drawing and get the fit review within 24 hours.
We are a make-to-print manufacturer: you send the drawing, we make the rod lenses — slim relay rods, rear rod lenses and uncoated blanks.
Glass and coating come from the drawing; standard building blocks are BBAR 400–700 nm and 40/20 surface, with NDA before files are shared.
The Problem
Four things that go wrong with ultra-thin relay rods
Φ1.19–1.96 mm — at this scale, small errors are big.
1 · Thin rods amplify centration error. At Φ1.19 mm, a few arc-minutes of centration error moves the image noticeably, and stacked rods make it worse. The defect shows up in the assembled scope.
How HSD avoids it: centration is measured per ISO 10110-6 on a per-batch sampling plan, with measured values on the COA.
2 · There is almost no fit margin. −0.02/−0.04 mm on a 1.2 mm rod leaves no room for drift; a slightly oversize rod binds in the tube, an undersize one rattles.
How HSD avoids it: diameter is measured and recorded per batch, so drift shows at incoming inspection.
3 · The “manufacturer” may be a trader. When drawings move through several shops, no one can explain a yield problem.
How HSD avoids it: we are the factory — a 30-person precision optical workshop; your drawing stays with our engineers.
4 · Batch drift is invisible until assembly. A “within spec” COA hides lot-to-lot shifts that surface in the finished scope.
How HSD avoids it: every batch COA carries measured values — dimensions, centration, surface, method.
Ultra-thin relay sets have to be consistent rod to rod — same tolerance package, same measurement method, same COA format.
Rod Lens Photos
Real rod lenses from our shop floor
Production photos in the slim rigid scope range, labeled by diameter. Final specifications per your drawing.
Φ1.19 mm
Φ1.77 mm
Φ1.86 mm
Φ1.90 mm
Φ1.96 mm
Scope of supply: relay rods · slim relay rods (Φ1.19–1.96) · special diameter/length rod lenses · uncoated rod lens blanks — all make-to-print per your drawing.
Small diameters make every tolerance count. Send the drawing and we will confirm what we can hold before production.
Specifications
Slim relay specs — small diameters, drawing-first tolerances
| Item | Specification |
|---|---|
| Rod lens diameter range | Φ1.19–8.0 mm (this page: slim Φ1.19–1.96) |
| Diameter tolerance | −0.02 / −0.04 mm (fit) |
| Centration | ≤3′, tighter per drawing |
| Surface quality | 40/20 · MIL-PRF-13830B / ISO 10110-7 5/40-20 |
| Edge chipping | ≤0.05 mm, per drawing · ISO 10110-7 E 0.05 |
| Coating | BBAR 400–700 nm, R<0.5% (per drawing) |
| Glass | Per drawing: JGS1 / H-ZF / H-LAK / H-K9L / N-SK15; material certificates with each batch |
| Length tolerance | Per drawing |
In-house production
Why you can check us
On slim relays, the COA carries measured diameter and centration per batch, which matters more than a pass/fail line.
ISO 9001:2015 quality system
In-house since 2009 — no reselling
Measured COA per batch
NDA standard before drawings
24-hour engineer quote
MOQ 10 · glass never substituted
FAQ
Common questions
Are you a make-to-print manufacturer?
Yes. You send the drawing, we make the rod lenses — slim relay rods, rear rod lenses and uncoated blanks.
What rod lens diameters can you make for slim rigid scopes?
Φ1.19–8.0 mm overall; this page covers slim rods Φ1.19–1.96 mm. Final diameter and length per your drawing.
What centration can you hold?
≤3′ on rod lenses, tighter if the drawing asks for it. The COA carries measured values, not a "within spec" statement.
What's on the COA?
Part number and revision, measured diameter and thickness, measured centration, surface quality and test method. Numbers — not PASS.
What's the MOQ and how fast is a quote?
MOQ 10. Quote within 24 hours of drawing confirmation; samples and production run on the same tolerances and the same process.
Have a slim rigid scope rod lens drawing? Make-to-print, quote within 24 hours.
Have a slim rigid scope relay drawing? Send it and engineering will confirm the small-diameter process within 24 hours.
Send Your Drawing → Email [email protected]Application context
Slim rigid scope relays: small diameters, tight tolerances
Slim rigid scope relays are the hardest to hold: Φ1.19–1.96 mm with tight diameter and centration. This page is the make-to-print route for those small relays.
Check on the drawing: small diameter, relay length and centration target; tolerances are confirmed before machining.
Can you hold centration on a Φ1.19 mm relay?
Yes, ≤3′ is held and measured per batch; tighter is possible per drawing.
Inspection & Metrology
We measure it — and the numbers go on your COA.
Every batch is verified with interferometry, centration measurement and surface inspection. You get the actual measured values, not a “within spec” checkbox.
Centration
Centration checked on the centration station, typically ≤3′. The reading shown is from a real part — 2.02′.
Surface Quality
Surface and edge quality inspected under a video microscope — scratch/dig per MIL-PRF-13830B.
What “Pass” Looks Like
A passing surface from a production run: PV 0.51λ, RMS 0.059λ. Rejects never leave the workshop.
Measured COA per batch — ask for a sample COA with your quote. · Learn how to read a surface map →
Real inspection record from this product line
Small lens fixture measuring a local defect — PV 1.126λ.
Real measurement, kept on file. Your COA gets the same kind of data.
See the Factory Live — Schedule a Video Tour
Watch rod lens grinding, polishing, centration measurement and final inspection in real time. All information shared during the tour is confidential — your NDA is welcome.
Schedule a Live Video Tour