ACHROMAT KITS

F14.1 CEMENTED OR OILED

FRAUNHOFER DOUBLET

(APPROXIMATE MEASUREMENTS)

DIAMETER

THICKNESS

APERTURE

BFL

EFL

CROWN/FLINT

PART # WITH TOOLING

PART# WITH NO TOOLS

4.12"

.650"

4.00"

55.37"

56.37"

BK7/F4

ACF4.14

ACF4.14NT

6.12"

.970"

6.00"

84.55"

84.55"

BK7/F4

ACF6.14

ACF6.14NT

8.12"

1.280"

6.00"

112.74"

112.74"

BK7/F4

ACF8.14

ACF8.14NT
WARNING: Newport Glass Works’s does not recommend these kits for juveniles (minors or young adults) because of potential health and safety issues. Please refer to Material Safety Data Sheets covering both glass materials, i.e., BK-7 and F-4. Parental Guidance required on this matter.

Note: If you do not want the plate glass tooling that goes with the achromatic blanks just add the letters 'NT' to the part number, e.g., ACF4.14NT.

The blanks are furnished with the mated surface machined. These surf aces are used to polish each other. The opposite (outside) surfaces of the achromatic blanks are machined also and plate glass grinding/ polishing tooling is supplied for these surfaces.

The tolerances you have to finish at are as follows: Radius tolerance is 1/20 %; finish thickness tolerance is +/- .005".

The system design was contributed by Max Bray, Phoenix, Arizona. Please refer to his narrative in the appendix or visit our web site for a discussion on the fabrication of an achromatic lens.

Please note that these kits are not recommend for a person who has not polished glass or mirror blanks before. The chances of making a mistake are much greater and costs for material are substantially higher.

For discussion on fabrication and cementing of the lens blanks, please refer to the following articles:

"How to Make a Lens', Telescope Making 3, p.34.

"Cementing Achromatic Lenses", Telescope Making 28, p. 16.