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Opticron Binoculars & Telescopes

A81M, A105M

A81M

Shown with eyepieces sold separately.

76062 A81M
This is a perfect telescope for the beginner astronomer as it offers a lightweight and compact design and is supplied with accessories that enable you to get set up simply and quickly.

The A81M is an achromatic refractor with an 81mm objective lens (aperture). Its focal length is 910mm with a focal ratio of f11.2. Its light gathering is 130 times better than the human eye and it has a maximum usable magnification of 144x. Weighing less than 3kg and measuring under 1m in length it is small and light enough to be transported to your observing site for quick set up and viewing.

The tube is supplied with a red dot finder, flip mirror, tube rings and dovetail mounting plate.

 

A105M
Shown with eyepieces sold separately.

76143 A105M
A larger aperture version of the A80M, this OTA also offers an excellent first choice as a telescope but with higher light gathering power.

The A105M is an achromatic refractor with a 105mm objective lens. Focal length is 1000mm with a focal ratio of f9.5. Its light gathering power is 225x.

The tube is supplied with a red dot finder, flip mirror, tube rings and dovetail mounting plate.

The 60mm visual back on the A81M and A105M can accept either an optional extension tube or diagonal to accommodate 50.8mm (2”) eyepieces. Various accessories are also available for attaching photographic instruments to the telescope. For more information Click here.

 

Model A81M A105M
Objective lens 81mm achromatic, multi-coated 105mm achromatic, magnesium fluoride coating
Focal length (Focal ratio) 910mm (f11.2) 1000mm (f9.5)
Resolving power, limiting magnitude 1.43 arc sec., 11.2 1.1 arc sec., 11.9
Light gathering power 134x 225x
Tube size & weight (OD) 90mm x (L) 890mm, 2.5kg (5.5lb) (OD) 115mm x (L) 1060mm, 3.8kg (8.4lb)
Finderscope Red dot finder Red dot finder
Adapter thread / visual back 60mm on scope body. 42mm for T-mount and 31.7mm push-fit on flip mirror. 50.8mm option* 60mm on scope body. 42mm for T-mount and 31.7mm push-fit on flip mirror. 50.8mm option*
Accessories included Dovetail adapter, tube rings, flip mirror, dot finder & carry handle Dovetail adapter, tube rings, flip mirror & dot finder
Photography** Prime focus, eyepiece projection and afocal imaging Prime focus, eyepiece projection and afocal imaging

*A 50.8mm mirror diagonal or a 50.8mm extension tube is needed to use a 50.8mm eyepiece. **Optional photographic accessories are needed.