Seven kinds of eyepieces for optimum optical performance
Bayonet mount with lock for easy attachment and release
Fully multilayer-coated
Waterproof up to 2m for 10 min., and fog-free — thanks to O-rings and nitrogen gas (body-and-eyepiece joint is water-resistant)
Turn-and-slide eyecup with three click stops: one for observing with the naked eye, one for observing with eyeglasses, and the other for digiscoping (except FEP-30W, FEP-25 LER and FEP-20-60)
FEP-30W offers a choice of eyecup: soft rubber eyecup for observation and digiscoping eyecup for connection with Digital Camera Bracket FSB series
FEP-25 LER has ultra-long 32.3mm eye relief
FEP-20-60 featuring long eye relief of 18.4-16.5mm employs an aspherical lens to minimise image distortion
Compact digital camera COOLPIX series can be attached to eyepiece of FEP series (except FEP-20-60) with Digital Camera Bracket FSB series