Frequently Asked Questions | Opto Engineering

What's the difference between MTF (Modulation Transfer Function) and CTF (Contrast Transfer Function)?

Does telecentricity means that "the inner or outer object walls completely disappear"?

What about distortion correction?

Why "Telecentric range" is a misleading concept?

How do I assemble a large telecentric lens?

Are the lenses used in the LTCLHP series the same as those in matching telecentric lenses? For example, do a LTCLHP120 feature the same lenses installed in a TC12120?

Is depth of field an available spec for LTCLHP series?

Why the divergence of collimating sources is not listed?

When coupling a LTCLHP illuminator with its compatible telecentric lens, which change occurs in the telecentric lens field depth?

Why plots for illumination uniformity are not included in the LTCLHP series documentation?

Why GREEN light is recommended for these products?

Why OE® Telecentric lenses don't integrate an iris?

Why OE® Telecentric lenses don't feature a focusing mechanism?

F/#, Working F/# and Numerical Aperture

Telecentric lenses depth of field

Back focal length adjustment

LED pulsing with OE® illuminators

Diffraction limit and CTF with small pixel detectors

F-mount interface and backlash

Types of pattern coatings

Could collimated light cause interference effects?

FAQ