Revision as of 11:17, 6 September 2010 by Gregal@uio.no
|Type||Focal length||Diameter||Height of center|
|Telescope lens||Achromatic air spaced doublet||1200 mm||150 mm||~163.5 mm|
|Collimator lens||Achromatic doublet||1827 mm||203 mm||~163.5 mm|
|Imaging lens||Achromatic air spaced doublet||1200 mm||150 mm||~163.5 mm|
|Singlet lens||Thin singlet lens||~300 mm||~50 mm|
|Doublet lens||Thick achromatic doublet lens, focal length written on edge||~100 mm||~50 mm|
|Doublet lens||Thick achromatic doublet lens||~300 mm||~50 mm|
|Compound lens||For illustration of coma||~50 mm|
|Compound lens||For illustration of transversal chromatic aberrtion, aperture at rear end||~50 mm|
|Barrel lens||Missing screw thread in middle, focus ~5 mm behind||~2.2 mm|
Laser: connected with fiber
- Description: laser connected with fiber to collimator tube.
- Class: IIIb (3B), 5 mW. Note: when used with the collimator tube the effective output is below class II, i.e. no risk for the eye.
- Wavelength: 635 nm.
- Description: black, long thick stick, He-Ne laser.
- Class: II, 0.95 mW.
Laser: small tube
- Description: small laser powered by 4.5 V flat battery.
- Class: IIIa (3R), about 4.5 mW.
White light ray emitter
- Description: white light ray emitter connected to collimator tube.
- Wavelength: 360-1700 nm.
- Stabilization time: 5 min.
- Types of bulbs: neutral helium (He I) and neutral neon (Ne I).
- He I lines should be easy to find:
|Yellow||5875.6||Double lines (5875.6148 and 5875.6404 Å)|
- Note: from the spectra given by the manufacturer, one should also be able to see a red double line at 7065.3 Å and a violet line at 3888.65 Å. However, a picture with long exposure time will have to be taken in order to see them and the latter will still be extremely weak.