Musoman
PETE - Nikon/Sony Shooter
Was just looking around the Astro-Tech site and found 2 reasonably priced scopes in shorter FL , like Fernandos' TS 804. We know Fernandos TS has a bit of curvature at the edges, as stated by him because of the short focal length, but apparently the 65ED is almost free of curvature according to reviews, perhaps because a flattener is already mounted inside ?
The 72ED also gets great reviews but probably suffers more from curvature than the 65ED
Astro-Tech AT65EDQ 65mm f/6.5 ED quadruplet spec
Length: 13"
Weight: 4.75 lbs.
Focal Length: 420mm
Focal Ratio: f/6.5
Aperture: 2.6"
MSRP: $549.00
Fully multicoated four-lens/two-group dual ED element refractor optics
Amazing flat field astrophotographic capabilities
Dual-speed 2” rack-and-pinion focuser with 10:1 ratio fine focusing
Non-marring 1.25” and 2” compression ring accessory holders
Rotating camera angle adjuster
Split mounting rings with Vixen-style dovetail
Sliding lens shade with lock knob
It uses an FPL-53 element in its 65mm f/6.5 apochromatic triplet objective lens, and has a separate field-flattening ED singlet lens at the rear of the optical tube.
-------------------------------------------------------
Astro-Tech 72ED 72mm f/6 ED doublet spec
Length: 12"
Weight: 5 lbs.
Focal Length: 430mm
Focal Ratio: f/6
Aperture: 2.83"
MSRP: $379.00
72mm f/6 air-spaced ED doublet optics
Premium ED (Extra-low Dispersion) glass from Ohara, Japan’s best known specialty optical glass manufacturer
Fully broadband multicoated, with blackened lens edges
Dual-speed rotating 2” Crayford focuser with 10:1 ratio micro- focusing
Non-marring 1.25” and 2” compression ring accessory holders
Self-storing retractable lens shade and 3 internal light baffles for better contrast
Combined dovetail/tripod bracket for use on either a photo tripod or a Vixen-style equatorial or altazimuth mount
Pic 1 and 2 AT 65ED Pic 3 AT 72ED
The 72ED also gets great reviews but probably suffers more from curvature than the 65ED
Astro-Tech AT65EDQ 65mm f/6.5 ED quadruplet spec
Length: 13"
Weight: 4.75 lbs.
Focal Length: 420mm
Focal Ratio: f/6.5
Aperture: 2.6"
MSRP: $549.00
Fully multicoated four-lens/two-group dual ED element refractor optics
Amazing flat field astrophotographic capabilities
Dual-speed 2” rack-and-pinion focuser with 10:1 ratio fine focusing
Non-marring 1.25” and 2” compression ring accessory holders
Rotating camera angle adjuster
Split mounting rings with Vixen-style dovetail
Sliding lens shade with lock knob
It uses an FPL-53 element in its 65mm f/6.5 apochromatic triplet objective lens, and has a separate field-flattening ED singlet lens at the rear of the optical tube.
-------------------------------------------------------
Astro-Tech 72ED 72mm f/6 ED doublet spec
Length: 12"
Weight: 5 lbs.
Focal Length: 430mm
Focal Ratio: f/6
Aperture: 2.83"
MSRP: $379.00
72mm f/6 air-spaced ED doublet optics
Premium ED (Extra-low Dispersion) glass from Ohara, Japan’s best known specialty optical glass manufacturer
Fully broadband multicoated, with blackened lens edges
Dual-speed rotating 2” Crayford focuser with 10:1 ratio micro- focusing
Non-marring 1.25” and 2” compression ring accessory holders
Self-storing retractable lens shade and 3 internal light baffles for better contrast
Combined dovetail/tripod bracket for use on either a photo tripod or a Vixen-style equatorial or altazimuth mount
Pic 1 and 2 AT 65ED Pic 3 AT 72ED