Davis Instruments Mark 25 Sextant,六分儀

馬克3六分儀 

有時(shí)也被稱(chēng)為“救生艇”六分儀，馬克3是一種廉價(jià)的培訓(xùn)六分儀。然而，這種模式已在世界各地的水手。它是全尺寸的，具有遮陽(yáng)，但沒(méi)有光學(xué)放大倍數(shù)，以幫助您找到昏暗的天體。

馬克15六分儀 

這種模式有很多強(qiáng)大的功能，包括7大遮陽(yáng)傘，3毫米X 27毫米口徑的星范圍，且易于閱讀的測(cè)微鼓的游標(biāo)刻度讀取到一分鐘的2月10日。馬克15具有7“（18 cm）畫(huà)框半徑畢業(yè)于120度到-5度，并配有傳統(tǒng)的半鍍銀鏡。

馬克25六分儀 

該行戴維斯塑料六分儀的頂部，馬克25我們的特色束會(huì)聚器?鏡，有時(shí)也被稱(chēng)為“全視界鏡子”。一個(gè)特殊的涂層被施加到高品質(zhì)的光學(xué)玻璃，以允許用戶(hù)看到通過(guò)該反射鏡，但仍然拾取圖像作為微弱的低光分。標(biāo)記25是由一個(gè)長(zhǎng)壽命的LED，并提出一個(gè)升級(jí)的塑料，這是非常穩(wěn)定的照明。

Mark 3 Sextant
Sometimes referred to as a "lifeboat" sextant, the Mark 3 is an inexpensive training sextant. Yet this model has taken sailors around the world. It is full-sized and has sunshades, but no optical magnification to help you find dim celestial bodies.

Mark 15 Sextant
This model has many great features including seven large sunshades, a 3 mm x 27 mm star scope, and easy-to-read micrometer drum vernier scale that reads to 2/10 of a minute. The Mark 15 has a 7" (18 cm) frame radius graduated from 120 degrees to -5 degrees and comes with a traditional half-silvered mirror.

Mark 25 Sextant
The top of the line Davis plastic sextant, the Mark 25 features our Beam Converger^? mirror, sometimes referred to as a "full horizon mirror". A special coating is applied to high quality optical glass to allow the user to see through this mirror, yet still pick up images as faint as low-light stars. The Mark 25 is illuminated by a long-life LED and made of an upgraded plastic that is very stable.