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Newport 910 spatial filter w/ 15micron pinhole and 20x objective, US $2400 – Picture 0
Newport 910 spatial filter w/ 15micron pinhole and 20x objective, US $2400 – Picture 0

Newport 910 Spatial Filter W/ 15micron Pinhole And 20x Objective

US $2400

  • Dublin, California, United States
  • Jun 11th
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Nice pristine Spatial filter by Newport, model 910. Comes with a nicely matched pinhole and objective. These units do not even have one tiny scratch. Former owner kept them super clean in a nice environment. I tested them with a 532nm 30mw pointer and it makes a nice clean beam as seen in pic. Pinhole is a 15 micron # PH-15, Objective is a 20X 0.40 and an unknown brand though it says "Japan" on it. The objective screws apart revealing an adjustment screw as well. Looks well made. The B-P2 base is NOT included unless you really want it and I'll throw it in. Just ask. I just needed something to attach it to for testing. There are better bases for this. 5 axis of adjustment. (That's two more than the model 900). This one also has a built in iris diaphragm to clean your beam up even more! Here is the recommended pinhole to objective ratio's as described by Graham Saxby's book, "Practical Holography" for a HeNe with a 1-1.5 dia. beam Objective magnification                     10          20           40          60         100 Focal length (mm)                             25          12.5          6.3         4.2          2.5 Minimum pinhole dia. (microns)         25          13             7            5             3 Size commonly used (microns)          50           20-25      10-15     7-10        5 There are other factors to consider such as wavelength, power and beam dia. for choosing the proper objective/pinhole combination. Thanks for looking

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