Products

Sloan Gen 1 Close-Out

 

These research filters were replaced in June, 2012 with our Generation 2 Sloan filters (click here). 

We are therefore offering our Gen 1 filters at close-out prices while quantities last. Only direct from Astrodon

The main differences are discussed  on the Gen 2 Sloan page.  Briefly,

  1. Different 50%T points for the i' and r' filters
  2. Introducing the z_s and Y near-infrared filters that together replace the z' cuton filter
  3. Retaining the z' filter for those preferring a cuton filter
  4. Significantly improving the out-of-band blocking to Tabs <= 0.03%T
  5. Edge-blackening each filter to reduce stray reflections

 

The incredibly high (>97%T) transmittance in the bandpass achieves the highest performance available.  The 100% coated construction using hard, sputtered coatings on 1/4-wave single fused silica substrates and no colored glass achieves long-term durability for consistent research over many years.

The following is a spectral compilation of actual scans of the Astrodon Photometrics Gen 1 Sloan filter set.

These filters are parfocal with all Astrodon LRGB and narrowband filters.

Specifications:

  • 50% transmission points provided above (+/- 3nm typical) (click here)
  • Peak transmission guaranteed > 95%  (>90% for u')
  • <0.1%Tave out-of-band 300 - 1100 nm
  • Striae-free, single fused silica substrates
  • 1/4-wave propagated wavefront prior to coating
  • <0.5 arcminute substrate parallelism
  • 3.000 +/-0.025 mm substrate thickness
  • 1.25" mounted
  • 49.7 mm dia. unmounted
  • 49.7 x 49.7 mm square unmounted
  • Proud supplier to Las Cumbres Observatory Global Telescopes, AAVSO and research organizations worldwide
  • Proudly made in the U.S.A.

 

SecurityMetrics Credit Card Safe

The Buy Now buttons direct you to PayPal for both PayPal and credit card purchases.  Credit cards, including international, are now accepted through PayPal without a PayPal account. UPS Ground for U.S. and UPS Expedited for International and Canada will be used for shipping.  ANY 1.25" filter can be mounted in a flat 31 mm insert for the same price. Please add a comment under instructions to vendor requesting 31 mm.

 

50mm sq. Gen 1
Unmounted u'
(u'-50S)

$280

1.25" Gen 1
Mounted g'

(g'-27R)

$100

50mm sq. Gen 1
Unmounted g'
(g'-50S)

$280

1.25" Gen 1
Mounted r'

(r'-27R)

$100

1.25" Gen 1
Mounted i'

(i'-27R)

$100

50mm dia. Gen 1
Unmounted i'
(i'-50R)

$240

50mm dia. Gen 1
Unmounted z'
(z'-50R)

$240

50mm sq. Gen 1
Unmounted z'
(z'-50S)

$280