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This Page Updated
21st October 2016

 

Parallax Instruments
For the past twenty years Parallax Instruments have been making Newtonian reflectors and Cassegrain telescopes. These are not "run of the mill" mass-produced instruments! Their prices are relatively high due to the expense of utilizing only the very best components available!
Pi250C 10" and Pi400C 16"
Classical Cassgrain OTA's
 Pi250C 10" f/15 Classical Cassegrain
mounted on HD200C
Parallax  Pi-250c Parallax Pi-320c
Pi400 Newtonian, HD200 Mount with Pier Pi400DK 16" Dall-Kirkham Cassegrain
Pi400 Newtonian, HD200 Mount with Pier Pi400DK 16" Dall-Kirkham Cassegrain
Parallax Pi250 Newtonian
Parallax Pi250 Newtonian Parallax Pi250 Newtonian
   
Classical Cassegrain Specifications
Specifications Pi250c Pi320c Pi370c Pi400c
Clear Aperture 254mm 318mm 368mm 406mm
Focal Ratio f/15 f/15 f/15 f/15
Focal Length 3810mm 4770mm 5520mm 6090mm
Primary & Sec. Mirror Pyrex lightweight conical primary - R.F. Royce Optical
Telescope Tube Aluminium
Primary Focal Ratio f/4 f/4 f/4 f/4
Secondary Amplification 3.75x 3.75x 3.75x 3.75x
Spacing (Approx.) 29.6" 37.6" 44.6" 61"
Mirror Coatings AlSiO
Optical Tube Diameter 12" 15" 16.5" 19"
Optical Tube Length 40" 48" 54" 66"
Optical Tube Weight 40 lbs. 60 lbs. 85 lbs. 130 lbs.
Focuser 2" Feather Touch or 2.7" AP (Specify)
Finderscope 7x50 (11x80 Optional)
Tube Rings Standard
Recommended Mount HD150C HD200C HD200C HD300C
Slewing Handles (2) Standard
Tube Counterweight Bar Assy. Standard
 
Price: Call For Price Call For Price Call For Price Call For Price
   
Dall-Kirkham Cassegrain Specifications
Specifications Pi250DK Pi320DK Pi370DK Pi400DK
Clear Aperture 254mm 318mm 368mm 406mm
Focal Ratio f/20 f/20 f/20 f/20
Focal Length 5080mm 6360mm 7360mm 8120mm
Primary & Sec. Mirror Pyrex lightweight conical primary - R.F. Royce Optical
Central Obstruct. ~ 25% by Diameter
Telescope Tube Aluminium
Primary Focal Ratio f/4 f/4 f/4 f/4
Secondary Amplification 5x 5x 5x 5x
Spacing (Approx.) 29.2" 39.2" 45.3" 50"
Mirror Coatings AlSiO
Optical Tube Diameter 12" 15" 16.5" 19"
Optical Tube Length 40" 49" 56" 60"
Optical Tube Weight 40 lbs. 49 lbs. 85 lbs. 130 lbs.
Focuser 2" Feather Touch or 2.7" AP (Specify)
Finderscope 7x50
Tube Rings Standard
Recommended Mount HD150C HD200C HD200C HD300C
Slewing Handles (2) Standard
Tube Counterweight Bar Assy. Standard
 
Price: Call For Price Call For Price Call For Price Call For Price
 
Newtonian Reflector Specifications
Specifications Pi200 Pi250 Pi320 Pi370 Pi400
Optical Configuration Newtonian Reflector
Effective Aperture (8") 254mm (10") 318mm (12.5") 368mm (14.5") 406mm (16")
Primary Mirror Pyrex
Focal Ratio   f/6 f/5 f/5 f/5
Focal Length   1524mm 1524mm 1842mm 2032mm
Secondary Mirror   46mm (1.83") 54mm (2.14") 66mm (2.60") 79mm (3.10")
Resolving Power   .45 arc sec .37 arc sec .33 arc sec .29 arc sec
Faintest Magnitude   13.8 15.0 15.3 15.6
Tube Length   1575mm (62") 1575mm (62") 1828mm (72") 2032mm (80")
Tube Diameter   305mm (12") 380mm (18") 416mm (16.4") 482mm (19")
Tube Weight   18.2kg (40 lbs.) 25kg (55 lbs.) 32.7kg (72 lbs.) 43.2kg (95 lbs.)
Finder 7x50
Focuser 2" dual speed Crayford
 
Price: Call For Price Call For Price Call For Price Call For Price Call For Price
 
Please note that prices for the above OTA prices are calculated on an individual basis due to their heavy weight and associated freight costs.
 
PARALLAX supply also a variety of EQUATORIAL MOUNTS
 
Parallax Standard Tube Rings
Parallax offer over 30 different sizes of telescope tube mounting rings ranging from 3" to 24" diameter including many metric sizes. Custom sizes are available.
Parallax Tube Rings   Parallax Rotating Rings
Please specify your drilling and tapping requirements when ordering (No Extra Charge)
 
75mm OD tubes (Astro-Tech AT-66, Willam Optics ZenithStar 66 SD APO)
3" OD Tubes (TeleVue TV-85 Refractor)
95mm OD Tubes (Takahashi FS-78, Sky-90, Takahashi FSQ-85EDX)
100mm OD Tubes (Orion ED80 and ED100)
4" OD Tubes (Genesis, Genesis SDF, TV-101, TV-102, NP-101, Orion ED80)
114mm OD Tubes (102 ED/APO, Takahashi FS-102 and FSQ-106, 4" Unitron)
125mm OD Tube, Takahashi FSQ-106ED, New TSA-120
5" OD Tubes (TeleVue NP-127)
130mm OD Tube (Explore Scientific 127 ED)
5.5" OD Tubes (Astro-Physics 130 EDT, Meade 127EDT, Celestron C-5, Pentax 125)
145 mm OD Tubes (Takahashi FS-128)
6" OD Tubes (D&G 5" Refractor and TEC 140 APO)
155 mm OD Tubes (Takahashi FS-152, Takahashi TOA-130)
6.5" OD Tubes (Astro-Physics 155 EDF Refractor)
7" OD Tubes (Meade 152 ED, D&G 6" Refractor)
179mm rings for Takahashi TOA-150 refractor
7.5" OD Tubes (Starfinder 6", Parks 6")
8" OD Tubes (Meade 178 ED, Astro-Physics 180 EDT, Takahashi MT - 160, Epsilon 160)
8.9" OD Tubes (Celestron C-8)
9" OD Tubes (D&G 8" Refractor)
9.1" OD Tubes (Meade 8" SCT)
232mm OD Tubes (Takahashi E-180, Vixen Visac 200 Newtonian, AT 8 RC)
9.5" OD Tubes (Starfinder 8")
10" OD Tubes
10.3" OD Tubes (Celestron C-9.25)
11" OD Tubes
11.63" OD Tube (Meade 10" SCT, Meade SN-10 Newtonian)
11.69" OD Tubes (AT 10 RC)
11.75" OD Tubes (Deep Sky Instruments RC-10)
12" OD Tubes (Celestron C-11, Vixen 260)
12" extra heavy duty - for 10-12" refractors
12.7" OD Tubes (Meade 10" Starfinder)
13.6" OD Tubes (Meade 12" SCT)
14" OD Tubes
14.17" OD Tubes (AT 12 RC)
15" OD Tubes
15.3" OD Tubes (Celestron C-14)
15.7" OD Tubes (Meade 14" SCT)
16" OD Tubes
16.4" OD Tubes (Parks 12.5" Newtonian)
17.5" OD Tubes (Meade 16" SCT)
19" OD Tubes (Meade DS16A, 16" Starfinder)
20.7" OD Tubes
22.4" OD Tubes
26.4" OD Tubes
 
Parallax Rotating Tube Rings
Please specify your drilling and tapping requirements when ordering (No Extra Charge)
 
6.5" rotating rings (MN-56)
7" rotating rings (Ceravolo HD145)
7.64" rotating rings (MN-66)
9.5" rotating rings (Parks 8" and Starfinder 8" Newtonians)
10" rotating rings(for model PI200 and 10" alum. tubes)
12" rotating rings(for model PI250 and 12" alum. tubes)
15" rotating rings(for model PI320)
16.5" rotating rings(for Parks 12.5" Newtonian)
 
For more information on these products please visit the Parallax website
Please contact AEC regarding availability and local prices

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