LDSSFilters

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Contents

1. Contents
2. SDSS filters
1. Transmission curves for SDSS filters from Asahi
2. Mechanical measurements of SDSS filters for LDSS
3. OG590 filter
1. Transmission curves for OG590 filter from Custom Scientific
2. Mechanical measurements of OG590 filter for LDSS
4. VR filter
1. General information
2. Mechanical measurements of VR filter for LDSS

SDSS filters

Transmission curves for SDSS filters from Asahi

(PDF)

(SXC OpenOffice data) (XLS Excel data)

Mechanical measurements of SDSS filters for LDSS

Round filters, no edge protection, fine ground edge, beveled. Measurements by AU and MG on October 4, 2004.

Filter	Serial #	Diameter	Thickness at 4 places	Notes
g	39	99.8	10.1, 10.0, 9.98, 10.0	-
r	41	99.8	10.0, 9.99, 9.98, 9.98	Fingerprints on the edge
i	43	99.8	9.98, 9.98, 9.98, 9.98	-
z	45	99.8	9.98, 10.0, 9.99, 10.0	-

OG590 filter

Transmission curves for OG590 filter from Custom Scientific

(PDF)

(SXC OpenOffice data) (XLS Excel data)

Received Jan 12, 2005 from Custom Scientific

Mechanical measurements of OG590 filter for LDSS

Filters received January 5, 2005.

Round filters, edges sealed, one side has three shadow areas around the edge about 2 mm deep at the deepest place, the other side has a general edge area that is not coated properly, also about 2 mm deep at the deepest point. These are probably not a problem and will likely be mased by the filter holder.

The edge is marked with "OG590 61764"

Filter	Serial #	Diameter	Thickness at 4 places	Notes
OG590	61764?	99.9	10.04, 10.04, 10.05, 10.05	Flaws at the edge of the aperture

VR filter

General information

Manufacturing specifications and other info from Arti Garg:

Cost	$2925
Cut-on wavelength	520.0 nm
Cut-off wavelength	720.0 nm
Tolerance of Cut-on and Cut-off wavelengths	± 12.0 nm
Angle of Incidence:	Normal, f/2.7 beam
Minimum Peak Transmission	84%
Blocking	No leaks worse than 0.01% (10e-4) 0.3-1.2 microns
Size	100.0 ± 0.1 mm dia. (round)
Minimum Clear Aperture	94.0 mm dia
Thickness	10.0 ±0.05 mm
Surface Flatness	lambda/4 per inch
Parallelism	1 arc minute
Scratch-Dig	60-40
A/R Coating	Both surfaces, average reflectivity < 1% per surface

Mechanical measurements of VR filter for LDSS

VR Filter 520-720 nm Lot 64918

From Arti Garg:

diameter: 3.944"

thickness: 0.401"