MM4 77 Fieldscopes are the latest evolution of the MM concept pioneered and developed by Opticron over the past 25 years to meet the ever-growing demand for lightweight, space saving high performance field equipment.

Designed & manufactured in Japan, the 77mm HDF ED optical system delivers a new benchmark for resolution and colour contrast and comfortably outperforms older Opticron 80mm models. What is more remarkable is the size and weight of the overall package. The MM4 77 GA ED is just 315mm/12.4” long and weighs 1250g/44oz fully armoured. These figures read like a 65mm which cannot deliver the light transmission or apparent resolution of this 80mm class device.

Compatible with SDL, HDF T and HR eyepieces, existing owners can use eyepieces from other Opticron models with MM4 77 Fieldscopes.

77mm HDF ED APO lens design
Fully multi-coated optical system
Lightweight polycarbonate and alloy body
Fully protected in soft touch textured rubber armour
Nitrogen waterproof
Wide wheel focuser with accurate 9:1 ratio dual focus system
Retractable lens hood
Integrated objective lens cover
Large footprint +/- 90° rotating tripod sleeve
Supplied with Opticron SDLv3 18-54x eyepiece 
Telephoto option for SLR photography

Supplied Accessories
MM4 77 GA ED Fieldscope kits are supplied with eyepiece and integrated objective lens cover
30 year (body), 10 year (eyepiece)

Product Code

Colour Black
Body Type Straight
Size 77
Lens Dia. (mm) 77
Lens Dia. (inch) 3
Close Focus (m) 5.5
Close Focus (f) 18
Eye Relief (mm) 22~17
Eye Relief (inch) 0.9~0.7
Waterproof Yes
Prism Type Porro
Tripod Sleeve & Mount Rotating Sleeve
Length (mm) 375
Width (mm) 107
Depth (mm) 95
Dimensions LxWxD (mm) 375x107x95
Dimensions LxWxD (inches) 14.8x4.2x3.7
Weight (g) 1508
Weight (oz) 53.2
Weight (lb) 3.3

Body Material Aluminium Alloy, Polycarbonate, Magnesium
Armour Type Full
Armour Material NBR
Nitrogen Gas Filled Yes
Retractable Lens Hood Yes
Focusing Speed Dual
EPTA Internal (mm) 29x0.75
EPTA Small External (mm) 35x1.1
EPTA Large External (mm) 41.5x1.1
Prism Coating Fully multi-coated
Lens Coating Fully multi-coated
Connection Type 1/4"
Serial Number Location Bottom face of tripod sleeve
Country of Origin Japan

MM4 77 GA ED Fieldscope + SDLv3 18-54x Eyepiece