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What are the focal lengths of a complete set of Mono eyepiece?

TMB Mono : 4, 5, 6, 7, 8, 9, 10, 12, 14, 16mm

The TMB 25mm is Aspheric Orthoscope, not Mono

There is also a TMB 1.8x ED Barlow, rated as one of the best barlow.

Why it is called Mono? What it mean by Aspheric Orthoscope? What is mean by Abbe-II Orthoscopic? Any special meanings? Or just a name, like G2000, Giodino etc.

Thomas Back said, "The 25mm TMB/Zeiss is a 2-1 group with one air space, a total of three elements, and with one surface aspherized. It is the best 25mm eyepiece ever made, unless one wants a wider field of view."

Aspheric Orthoscope have one surface aspherized, which is critical to the performance.

A monocentric eyepiece is a three-element, one-group eyepiece in which every surface has the same center of curvature--hence the name.

我個40mm eyepiece 跌爛咗,未得閒配.
有時間要找找方生.

Lewis, 叫我花名社長或方Sir吧，那位比我年長的Willis至今還稱呼我為"方生"，感覺怪怪的

40mm目鏡是用在哪台鏡上? 可能有點過長，引用Televue創辦人Al Nagler的看法，看深空天體要用一個最高而又可容下該天體的倍率，而看行星月面則要用最低而又能看到細節的倍率，而在香港這種光害背景下，其實看深空天體還是要提高一點倍率的。

社長 寫:Lewis, 叫我花名社長或方Sir吧，那位比我年長的Willis至今還稱呼我為"方生"，感覺怪怪的

Just get use to it! OK! I will call u Savio 弟弟