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Why buy the MM4 77 Fieldscope?
MM4 77 Fieldscopes from Opticron join it's MM concept range of scopes. The range has been developed over 25 years with Opticrons aim to meet growing demands in building lightweight, compact and top performing field equipment.
This scope combines all the greatest features of the popular 50mm and 60mm travel scopes in the range and delivers smaller, lighter, brighter, sharper viewing to a new market. The scope is targetted at users who're seeking the maximum amounts of brightness and magnification available for viewing and recording wildlife on a fixed position.
The MM44 scopes are built and designed by Opticron in Japan. A 77mm HDF ED optical system has set a benchmark in superb resolution, plus colour contrast. It seriously outperforms many of the older versions of the Opticron 80mm models.
Light Weight & Compact builds
The MM4 77 GA ED Angled Body Scope is just 320mm/(12.6”) long and weighs 1259g/(44.4oz) fully armoured. These figures read like a 65mm which cannot deliver the light transmission and apparent resolution of this 80mm class model.
The MM4 77 GA ED Straight Body Scope is just 315mm/(12.4”) long and weighs 1250g/(44oz) fully armoured. These figures read like a 65mm which cannot deliver the light transmission and apparent resolution of this 80mm class model.
Key features of the MM4 77
- 77mm HDF ED APO lens design
- A fully multi-coated optical system
- Alloy and polycarbonate body makes it extremely lightweight.
- Full protection is given by a soft, textured rubber armour
- Nitrogen waterproof
- A wide wheeled focuser which has an accurate 9:1 ratio dual focus system
- A retractable lens hood
- An integrated objective lens cover
- Large footprint +/- 90° rotating tripod sleeve
- Telephoto option for SLR photography
Opticron 40862 HDF Eyepiece
- HR Scope 18-54x (when fitted to the 66 model) / 24-72x (when fitted to the 80 model)
- GS Scope 16-48x (when fitted to the 665 model) / 20-60x (when fitted to the 815 model)
- ES Scope 20-60x (when fitted to the 80 model) / 27-80x (when fitted to the 100 model)
- MM2 Scope 12-36x
- IS Scope 12-36x (when fitted to the 50 model) / 15-45x (when fitted to the 60 model) 16-48x (when fitted to the 70 model)
About Eyepieces
Eyepieces are denoted according to their magnification, whether they are wide angled (WW or WA) or variable zoom eg. 20-60x. A 20x eyepiece allows the object being viewed to appear 1/20th of its actual distance away when compared to the naked eye. Using this rule an object 500m distant appears to be only 25m away. A 30x eyepiece makes the object appear 16.7m distant while a zoom eyepiece set at 60x means the same object appears to be just over 8m away.
What magnification? Terrestrial telescopes are most commonly used for high magnification viewing over long distances in daylight. Image quality at different magnifications will depend on the optical system, the quality of glass used and the coatings applied to the surfaces of each lens. There are however a few general rules that can be applied in determining the right specification for your needs. Firstly, the relationship between magnification, objective lens dia. and the size of the eye pupil, and secondly the quality of the optics inside the scope.
In normal daylight, when the pupil is dilated to between 2 and 3mm, a 66 mm telescope will deliver optimum performance, (the balance between magnification and image brightness) between 22x and 35x magnification i.e. when the exit pupil diameter equals that of the iris. In low light when the pupil becomes larger, dilating to between 5 and 7mm depending on age, optimum performance can only be obtained by using a lower magnification eyepiece or using a larger objective lens telescope such as an 80mm or 100mm. The higher the magnification, the greater the image and colour distortion. These effects can be dramatically reduced by using ED or Fluorite combination objective lenses that minimise chromatic aberration but are expensive. At magnifications of 30x or lower, the benefits of these objective lenses are hardly noticeable when compared to conventional glass objectives.
Field of view is usually expressed as the width in metres of the image when viewing at a distance of 1000m and is directly related to the magnification. Generally the greater the magnification, the smaller the field of view. There are exceptions, namely wide-angle eyepieces which are designed specifically to provide greater fields of view. It is important to note that the objective lens, irrespective of diameter has no influence over the field of view.
Light transmission The best way to assess the actual brightness of any telescope and eyepiece combination when choosing for daytime terrestrial use, (assuming equal optical systems) is to calculate the exit pupil diameter in the same way as with a binocular and making a trade-off between image brightness and magnification desired. For general daytime terrestrial observations, good compromise magnifications are between 20x and 30x for a 60mm, 25 to 35x for a 66mm and 25 to 40x for an 80mm.
Resolution As a general rule a good telescope should be able to resolve two black dots 1.5mm distance apart on a white surface, in bright daylight from a distance of 50m.
Eye relief This is the distance between the eye lens and the point where the pupil is positioned for full field of view and varies from the eyepiece to eyepiece. In some cases, the eye relief is shorter than that required by spectacle wearers to obtain the full field of view, especially at higher magnifications. If it is important that you obtain the full field of view with spectacles please choose any of the following eyepieces: SDL, HDF (all models), HR; 40812, 40930, 40931, 40932 and 40933, IS; 40916, 40918, 40919, HR.MM2 4090. Remember, rubber eyecups although fitted to many eyepieces are no guarantee that the full field of view is obtainable when setting in the down' position and used with glasses.
Straight-through or 45 Degree angled Common advantages of an angled telescope is that: i) the back, shoulders and neck are in a more relaxed position when looking through the scope, ii) the tripod can be set at a lower position making it easier for people of different heights to use and the equipment more stable in outdoor conditions. Straight-through telescopes are easier to use when following fast moving objects, using the instrument from the confined spaces of a hide or vehicle, or when hand-held.
Our advice
Compare different models side-by-side at the same magnification if possible. Product reports are generally subjective and are no substitute for individual testing. If you are unable to test before you make a purchase, contact us for information and advice on the best model to suit your needs.
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