- Reviewer left no comment
- found the main focusing adjuster very stiff to move.
Published on: 05 July 2016
Introduced in response to demand for high quality lightweight waterproof telescopes the Opticron GS 665 series set the standard for people wanting to take-out and walk-about with their equipment whether for birdwatching or general wildlife observation. Available in straight-through or 45°, the models are designed and manufactured to meet the three main requirements demanded by today's active fieldscope user: high-end optical performance, usability and reliability.
'High end' optical performance and value
The GS 665 uses a 66.5mm dia objective lens without any noticeable gain in size or weight over a 65mm. With a 5% more light entering the telescope, more light is emitted, resulting in brighter images compared to a standard 65mm throughout the magnification range. 100% designed and manufactured in Japan using high quality glass and other materials, each GS 665 produces high resolution images with minimal edge distortion and accurate color reproduction.
The GS 665 is designed to provide class winning optical performance seamlessly in even pretty harsh conditions. Protected by full body natural rubber armour, the centrally positioned focusing wheel allows easy access for both right and left handed users and is rubber covered to deliver a positive feel with or without gloves. The focusing system is designed to allow adjustment from infinity to 50 metres in just a 270° turn with close focus set at 4m. Housed within the same mechanism is a 9:1 ratio focus adjuster, providing greater focusing accuracy at top end magnifications.
More often than not, telescopes need to be tripod mounted for image stability so any weight saving is crucial. Constructed to be as light as possible, the standard GS 665 weighs less than 1kg (w/o eyepiece) and as a result can be used comfortably on a standard ‘non fluid’ panhead often found on Clamps or Travel Tripods. In addition each GS is fitted with a -/+ 90° rotating die-cast alloy tripod sleeve with 45° incremental 'stops'. This feature enables the scope to rotate around its’ central axis for accurate positioning when mounted to a bipod or on a clamp in a Hide or Blind. To avoid problems of reflected light on the objective lens in bright sunlight models are fitted with a retractable lens hood with integrated objective lens cover.
Having access to full a range of eyepieces is also important. The GS 665 series are fully compatible with Opticron SDL and HDF T eyepieces including the 40862G HDF T 16-48x and 40809G HDF T 25xWW.
Extensively tested for continuous trouble free use in varying temperatures, the models are fully nitrogen gas filled waterproof and come with the assurance of a 30 year guarantee.
OG dia (mm)
Min Focus (m)
|Ease of use|
|Value for money|
|Scores 10.0 out of 10 based on 1 review|
Get offers & events information that only subscribers will find out about.
Simply enter your details into the form.
Technical specifications for guidance only and cannot be guaranteed accurate. All offers subject to availability and while stocks last. Errors and omissions excepted. Clifton Cameras Limited is a company registered in England and Wales under company number 5859660. Our registered office address is Clifton Cameras Ltd, 28 Parsonage St, Dursley, Gloucestershire, GL11 4AA.
Clifton Cameras Limited acts as a credit intermediary offering credit products from V12 Retail Finance Limited. Clifton Cameras Ltd is authorised by the FCA with credit licence number FRN728300.
© 2020 Clifton Cameras. All Rights Reserved.