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Telescopes > Askar > Askar Apochromatic refractor AP 91/609 91F Flatfield
Product no.: 90697

Apochromatic refractor AP 91/609 91F Flatfield

RRP: $ 1,540.00 Our price:
$ 1,310.00 incl. VAT plus shipping costs
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short-term
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  • Triplet design with one ED element
  • Integrated corrector
  • No further corrective optics required
  • For visual observations and astrophotography alike
  • M48, M54 and M64 adaptors included in delivery

Product description

Compact, portable and powerful apochromatic refractor for beginners or as a travel telescope!

The Askar Flatfield Apo has a lens design with three front lenses in the objective and a rear correction lens. ED glass in the objective effectively reduces chromatic aberrations. The Apo is corrected for 44 mm full-frame cameras.

Thanks to the integrated correction lens (field flattener), the Apo does not require an additional flattener or complex back focus calculations. Simply connect your camera, adjust the focus and you're ready to take pictures. This makes astrophotography easier and more fun!

The telescope is compact and easy to transport, no matter where your journey of discovery takes you. It is designed for both visual observations and photography. It comes with a photographic adaptor with integrated 2-inch filter thread and has M48×0.75 and M54×0.75 thread connections, making it compatible with DSLRs and astronomical cameras for quick connection and instant shooting.

The telescope has a retractable dew shield that reduces the transport length and improves portability. The inside of the tube is lined with matt felt to better eliminate stray light, while the outside features an elegant blue and white colour scheme, high-quality CNC machining and paint finish.

The two finder shoes and carrying handles offer many options for attaching accessories.

The Vixen-standard prism rail is 230 millimetres long and can be screwed into place using 1/4" and 3/8" standard photo threads.

The R&P focuser (eyepiece extension) is equipped with a 1:10 fine adjustment. The fine adjustment knob has a non-slip knurled surface. The integrated 360° rotator allows the camera sensor to be optimally aligned with the subject. The focuser also allows for easy mounting of an optional electronic focuser, such as the EAF from ZWO.

It not only matters which telescope you buy but also where you buy it. Our additional services:

  • We are a leading telescope dealer and know the devices we sell. Our customer service team will gladly help you after your purchase if you have problems with assembly or operation.
  • We provide a copy of the 80-page Telescope ABC beginners handbook with every telescope.

Specifications

Optics


Type
Refractor
Type of build
Apochromat
Aperture (mm)
91
Focal length (mm)
609
Aperture ratio (f/)
6,7
Resolving capacity
1,52
Limit value (mag)
11,6
Light gathering capacity
170
Max. useful magnification
182
lens design
Triplet
Tube weight (kg)
4,52
tube diameter (mm)
96
dew cap diameter (mm)
114
Carrying length (mm)
513
Fully Corrected Field (mm)
44

Focuser


Type of build
rack and pinion
Connection ( to eyepiece)
2
Connecting threaded socket (camera-side)
M48, M54, M64
Free aperture (mm)
61
Motorized
optional
Ring clamp
yes
Gear reduction
1:10 fine focusing
Adjustment range (mm)
30
Tilting Adaptor
no
Rotating
yes
Filter thread
yes

Mount


Type of build
OTA
Mounting type
no mount

Included accessories


1.25'' eyepieces
20mm, 8mm
Dew Shield
yes
Deviating optics
Amici prism, 1.25", 45°
Corrector
integrated
Prism rail
Vixen-Style
Thread for camera tripod
1/4" & 3/8"
Carrying handle
yes
finder base
Vixen/Skywatcher Level
Eyepiece adaptor
2" / 1.25"
Tube clamps
yes

Area of application


Astrophotography
yes (very good)
Moon & Planets
yes
Nature Observation
yes
Nebulae & galaxies
yes
Sun
no (Only with appropriate Sun filter)

Recommended for


Beginners
no
Advanced
yes
Observatories
no

Product safety

Manufacturer: SHARPSTAR OPTICS CO.,LTD, 3/F, No.5 building , Science and Technology Center, No.79 Jin-Sui Road,, 314001 Zhe-Jiang, CN, http://www.sharpstar-optics.com
Responsible person: NIMAX GmbH, Otto-Lilienthal-Str. 9, 86899 Landsberg am Lech, DE, [email protected]

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*All prices include VAT plus shipping costs.

Askar Apochromatic refractor AP 91/609 91F Flatfield
Features
Askar Apochromatic refractor AP 91/609 91F Flatfield
Included accessories
Askar Apochromatic refractor AP 91/609 91F Flatfield
Includes

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