Applications and compatible instruments
For optical focus checks, visual resolution comparisons and periodic-response tests in cameras, microscopes and imaging lenses.
Optical Resolution Chart, R25 Grating
Line-Pair Grating Target R25: For optical focus checks, visual resolution comparisons and periodic-response tests in cameras, microscopes and imaging lenses.
Choose by function
What it is and what it does
Alternating opaque and clear bands form a binary amplitude grating. One line pair is a complete dark-plus-clear period.
When to choose it
Useful for focus comparison and periodic-pattern response, and in compatible Ronchi optical test arrangements. The instrument layout determines how the observed bands are interpreted.
How it differs from related products
Ronchi rulings repeat a fixed line-and-space period; a USAF chart steps through labelled frequencies, while a star changes frequency with radius. Binary line contrast contains harmonics and is not directly the sinusoidal MTF.
What can be customised
Line period, duty cycle, line direction, useful area and polarity define the main options.
What you receive
A glass target in the selected pattern, polarity and substrate format, with the dimensional inspection or calibration records included in the order.
Product-specific applications and pattern selection
Details of this pattern
Configuration & ordering
- Pattern reference: R25; approved artwork and revision
- Active field, scale or feature geometry and optical-plane location
- Material, outside dimensions, thickness and mounting datums
- Working instrument, illumination and viewing side
- Critical tolerances, inspection intervals and reporting needs
Inspection & acceptance
Inspect line width, pitch, duty cycle, orientation and missing or bridged features across the usable field.
Quality & Inspection PhotolithographyWhere this product is used
Compare focus and resolved detail with this optical test pattern.
Common questions
Which details matter when comparing pattern variants?
For pitch p in millimetres, frequency is 1/p line pairs per millimetre. At 50% duty cycle each bar and gap is p/2. State whether frequency refers to the target or image plane.
Selection notes
Line-Pair Grating Target R25: For optical focus checks, visual resolution comparisons and periodic-response tests in cameras, microscopes and imaging lenses.
Match this artwork reference to its labelled dimensions, polarity and active field. The product image, manufacturing artwork and inspection drawing should identify the same revision.
Information for your inquiry
Artwork reference, labelled geometry, active area, substrate outline, illumination and inspection requirements.
How do I distinguish this reference from another pattern in the same family?
Use the pattern reference and its specific geometry, labels and intended measurement. A similar outline or photograph does not establish the same frequency, coordinates or reading convention.