Surface Figure
Surface form tested by interferometry — PV/RMS values from the actual measurement.
Standard Size · Made to Print
3.49 x 29.00 mm Rod Lens — Standard Size, Made to Print
This 29.00 mm relay step is already in production. Send the drawing and get a fit check, tolerance review and quote within 24 hours. No custom-quote wait. Supplied as uncoated rod lens blanks for coating laboratories, or finished per your drawing for OEM assembly, with a measured batch COA. It uses a larger 3.49 mm diameter with the 29 mm relay pitch for multi-element builds.
✓ ISO 9001:2015
✓ NDA Protected
✓ COA per Batch
✓ MOQ 10+
✓ Quote in 24h
Quick Answer: Φ3.49 × 29.00 mm is a proven production size, supplied uncoated for coating labs or finished per drawing for OEM assembly. Diameter −0.02/−0.04 mm, centration ≤3′, batch COA with measured values, MOQ 10.
Specifications
Standard Specs — Confirmed Against Your Drawing
Final tolerances, glass grade and build type are confirmed against your drawing at quote.
Size Positioning
Where Φ3.49 × 29.00 mm Sits in the Range
Φ3.49 × 29.00 mm combines a 3.49 mm diameter with a 29.00 mm relay pitch, a pairing suited to multi-element relay builds with more cross-section for the optics.
This larger-diameter pairing is usually found in multi-element relay sections where the optical cross-section is designed for more elements.
Design Notes
What to Confirm for Φ3.49 × 29.00 mm
Design note: Φ3.49 × 29.00 mm suits multi-element builds; confirm element count and interface diameters on your drawing.
Two Supply Paths
How We Supply Φ3.49 × 29.00 mm
For Coating Laboratories
Φ3.49 × 29.00 mm blanks are supplied uncoated with diameter tolerance held for coating labs.
For OEM Assemblers
Finished rods are produced to drawing, with centration and surface checks on the batch.
Real Production Photos
Φ3.49 × 29.00 mm in Our Production
Photos are production references; final dimensions follow your drawing.
3.49 diameter reference
29.00 length reference
Proven Size
Why Φ3.49 × 29.00 mm Is a Standard
The larger diameter gives more cross-section for multi-element relay optics while keeping a 29 mm pitch; the size is proven in production.
Drawings first. A drawing is always the fastest way to a precise match — send yours and we take it from there.
In-house production
Factory Checks for Φ3.49 × 29.00 mm
You can verify Φ3.49 × 29.00 mm with our batch COA; measured values are recorded per batch.
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
Quality Evidence
Φ3.49 × 29.00 mm — The Numbers Go on Your COA
Φ3.49 × 29.00 mm batches carry measured diameter, length and centration on the COA.
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
Workstation scratch measurement — PV 2.876λ; the same inspection gate applies to Φ3.49 × 29.00 mm.
Real measurement, kept on file. Your COA gets the same kind of data.
FAQ
Common Questions for Φ3.49 × 29.00 mm
Is Φ3.49 × 29.00 mm a standard size?
Yes, it is in the 245-size database and made to order with MOQ 10+.
Why choose a larger diameter?
More cross-section for the relay elements and more design margin.
Can you supply it as a blank?
Yes, uncoated blank for coating laboratories.
What centration can you hold?
≤3′, tighter per drawing.
What documentation is included?
Batch COA with measured values plus material certificate.
Related
Related Sizes for Φ3.49 × 29.00 mm
Standard Rod Lens Sizes
Full 245-size database, by family.
Rod Lenses — Product Range
Relay and rear rods, Φ1.19–8.0 mm, per drawing.
Applications
Hysteroscope, cystoscope and slim rigid scope optics.
Factory Video
Tour the Factory for Φ3.49 × 29.00 mm
See Φ3.49 × 29.00 mm multi-element production and inspection in the factory video tour.
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