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ASA DDM85 Basic Direct Drive EQ Mount 45kg Load - ON DEMONSTRATION!

ASA DDM85 Basic Direct Drive EQ Mount 45kg Load - ON DEMONSTRATION!

can be shipped within 30-60 days

Price includes VAT, plus delivery

The DDM85 is ASA's workhorse for professional Astrophotographers and is suitable for portable use. - NOTE Delivery is extra on this item.

ASA's DDM85 mount has already received praise from acclaimed astrophotographers worldwide. Many of them have completely abandoned extra auto-guiders and therefore don´t have to sort through a variety of images any more. Many DDM85 series mounts are used in remoteinstallations. The DDM85 can be be run on a 12V power supply and powered by a single battery. Since the DEC can be separated from the RA axis, the DDM85 can be transported with ease. An important factor when choosing a high capacity mount. All power and data cables are internally wired through a large dimensional hollow axle. The mount can also be fixed to an equatorial pier (optional) rendering meridian flips obsolete.

The DDM85 series is available in three different models:

BASIC: This has an imaging capacity of 45kg (100 lbs) . Mounted on a moveable base plate, a fast polar alignment can be conducted using 4 adjustment screws. The screws can easily be fastened by hand and are also big enough to use at night.

STANDARD: Imaging capacity 65kg (143 lbs). The standard version uses the DDM85's traditional polar height cradle.

PREMIUM: This model has a much higher imaging capacity of 100kg (220 lbs). It is designed to be used with a custom made equatorial pier

The tracking accuracy of the DDM85 is outstanding. Guiding systems are normally unecessary and can actually make tracking worse when used with the DDM85. This is impressively demonstrated through testing. Tracking without correction via autoguider over a period of one hour shows 0.68” peak to peak and 0.18” RMS, respectively. The setup used for this record was: ASA DDM85 and ASA 16N OK3


To confirm the superior performance of ASA Mounts, we keep an ASA based demonstration system at our hosting partner e-Eye. This system is based upon an ASA N250 Astrograph and ASA DDM85 Basic Mount. This allows us to demonstrate the superiority and simplicity of an ASA system and its guide free performance. Please contact us if you are interested in experiencing the performance these systems offer.

Supplied with the DDM85 Basic are

1pc Autoslew Control Software
1pc Sequence Imaging Software
1pc 4.5kg Counterweight
1pc 9kg Counterweight
1pc 400mm Counterweight Shaft
1pc Universal (Losmandy / Vixen) Saddle Clamp
1pc 12V PSU
2pc USB 2.0 Cable (1.8m)
4pc Accessory Cables (Power / Focuser / Scope / Fan)

NOTE: No tripod or pier is supplied with this mount

General Specifications

Type German Equatorial
Axis Diameter 85mm Hollow Axis
Bearing 4 Pre-Loaded Taper Roller Bearings 130/85mm
Weight (No Shaft) 43.5kg (Both Axis)
Load Capacity 45kg (Imaging / Instrument)
Drive Noiseless High Torque Direct Drive on both Axis
Voltage 12v
Amperage 0.4-0.8A Max 10A
Pointing Accuracy* <12" RMS with Pointing File
Tracking Accuracy* 0.35" RMS over 5 minutes
Encoder Resolution 0.02" on the axis
Slew Speed 13° Second
Counterweight Shaft 60mm High Grade Steel
USB Hub Internal USB 2.0
Additional Connections Data, Fan
Remote Capable Yes

*As tested with an ASA telescope

Autoslew Control Software by Dipl. Phys. Phillip Keller

Sequence Software

1 pcs Counterweight 4,5 kg
1 pcs Counterweight 9 kg
1 pcs Counterweight shaft 400 mm (optional other shaft available)
1 pcs Universal Vixen / Losmandy Saddle Clamp
1 pcs Mount base plate
1 pcs Power cord with banana jack
2 pcs USB-cable - 1.8 m

NOTE: No tripod or pier is supplied with this mount


General Specifications

Type of mount                                     German equatorial

Diameter of axis                                  85 mm hollow axis

Bearing                                                4 preloaded taper roller bearings 130/85 mm

Weight of mount without shaft           43.5 kg

Loading capacity                                 45 kg (instrument)

Drives                                                  Noiseless high torque direct drive motors in both axis

Voltage                                                12 V

Amperage                                            0.4 - 0,8 Ampere

Absolute current peak                         10 Ampere

Pointing accuracy*                           < 12" RMS with Pointing file

Tracking accuracy*                               0.35" RMS in 5 Minutes

Encoder resolution                               0.02" on the axis

Altitude range                                      20-70° (0-90° Wedge Optional)

Moving speed                                       13°/Sec.

Counterweight shaft                            60 mm high grade steel

USB Hub                                               3 port USB2.0

Additional Connections                         Data Connections (eg focuser). Fan PSU

Remote capable                                    Yes

*As tested with an ASA telescope


Other Features

Pointing model calculates all repeatable faults

Extremely accurate tracking without external guiding

Very accurate Positioning

Fast but accurate polar adjustment

Automated motor tuning

Home position

2 Park positions

Set limits even without pointing

ASA Software Sequence can auto create pointing models

MLPT for local pointing models

Additional Software Required, Maxim DL, PinPoint, Planetarium software




Product Note Status Price
EMC Astro S130 Pier System EMC Astro S130 Pier System
£1,349.00 *
Prices includes VAT, plus delivery
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