4 Piece Lens Extension Ring Set EXT-UL-SETMidOpt EXT UL SET 4 Piece Lens Extension Ring Set Includes the following 4 Extension Rings 1mm EXT 1. 0 5mm EXT 5. 0 10mm EXT 10. 0 20mm EXT 20. 0 About Lens Extension Rings Extension Rings are used to decrease the Minimum Object Distance (MOD) for C CS mount lens Increase Magnification for close up applications Available as a 6 Extension Ring Set, 4 Extension Ring Set, and in individual size ranging from 0. 5mm to 100mm Manufactured by Midwest

90 mm Chief Ray Angle 4

And to further enhance your testing

Need Help Sizing a Fujinon Lens

Focal Length: 50mm

Weight: 235g

HF25SA-1 suggested replacement is HF25XA-5M

BN532-27 Narrow Green Bandpass Filter

5 Female Thread M37 Manufacturer Midwest Optical Systems

CF25HA-1 Technical Specifications:

84 mm Entrance Pupil Position Not Specified TV Distortion (%) -0

Aperture: f/1

3 - f/22 HF75HA-1B