Prism material:BAK4. BAK4 prism and multi-coated lens for improved light transmission and image clarity. Keep a proper exit pupil distance with the eyepiece. If the stickers are too close or too far away, you will feel dark shadows in the field of view when observing, and you will not be able to get a complete circle of vision.
eBay
Svbony SV227 2/1.25inch Filter 5nmH-Alpha SII-CCD OIII-CCD Narrow Band for Astronomy Telescope Deep Space Planetary Photography
Aliexpress UK
Discover the beauty of nature up close with this powerful spotting scope! 1 x Spotting Scope. 1 x Tripod. Superior Optics for Bright, Clear Views: Equipped with a fully multi-coated 60mm green film objective lens and a high-quality BAK4 Porro prism, this scope maximizes light transmission, providing sharper, brighter images and a wider field of view (40M/19.2M-1000M).
eBay
EYSDON Bahtinov Mask Focusing Mask Fish Bone Plate for Telescopes (for Outer Diameter from 80mm-110mm)
Aliexpress UK
Model Number.
eBay
EYSDON Bahtinov Mask Focusing Mask Fish Bone Plate for Telescopes (for Outer Diameter from 200mm-260mm)
Aliexpress UK
1 x 30x60 Binoculars. - Easy and practical to use, compact and durable. 1 x Black Carry Bag. ApplicationBirding, General Purpose, Hunting. 1 x Clean Cloth. - Folding design, light weight and portable to carry.
eBay
APEXEL HD Metal 20-40x zoom telescope lens phone telephoto Lenses With Extendable Mini Tripod for Samsung iPhone all Smartphones
Aliexpress UK
The product is a compact binoculars with a maximum magnification of 40x and a fully multi-coated lens coating. It features a porro prism optical design and is of British origin. With a sleek black colour, this powerful binoculars offer high definition and long range viewing up to 2000m. Ideal for outdoor activities such as bird watching, hunting, or stargazing, this binoculars provide a clear and detailed view with its BAK4 FMC technology. Perfect for photography enthusiasts capturing distant subjects with precision and clarity.
eBay
T2-PK for T2 (M42x0.75) mount - Pentax K PK Mount Adapter Ring T2-K T-PK T-K KAF KAF2 for Pentax K1 K3 K5 K50 etc. for Telescope
Aliexpress UK
Experience crystal-clear views with our HD binoculars featuring BAK4 prisms and FMC lenses for superior light transmission. The compact and foldable design makes these binoculars easy to carry, perfect for travel, camping, and other outdoor adventures.
eBay
Vixen Dovetail Multi-purpose Dovetail Groove 45/60/90/120/150/180/210/240mm Guide Mirror Dovetail Plate Astronomical Accessories
Aliexpress UK
This compact adults binoculars is ideal for campers, hunters, sports enthusiasts and concert goers tourists. Binoculars bird watching provides sharp clear optical performance at an unbelievable value.
eBay
Svbony SV133 Telescope Filter Wheel 1.25/2 Inch Metal Filter 5 Positions for Telescope Eyepiece for astronomical telescopes
Aliexpress UK
Prism material:BAK4. BAK4 prism and multi-coated lens for improved light transmission and image clarity. Keep a proper exit pupil distance with the eyepiece. If the stickers are too close or too far away, you will feel dark shadows in the field of view when observing, and you will not be able to get a complete circle of vision.
eBay
Angeleyes UHC Light Pollution Blocking Filter, Urban Pollution Filter, 1.25 ", Astronomical Telescope Accessories
Aliexpress UK