www.astrocafe.hk

HANS 寫:社长 我想问一下那个适合2寸的牛反的调教座 ，我想订购一个 ，接口最好 也是2寸的，请社长给各连接

谢谢

If your telescope is a Newtonian, where the focuser axis will move in a generally horizontal direction, our standard 2" focuser should work fine.

If however, the focuser axis of travel is perpendicular, as in Refractor and Schmidt-Cassegrain style telescopes, you may want to consider a focuser with an internal brake.

Also, because the motion of our FeatherTouch Focuser is so smooth and free moving, it may become necessary to increase the friction to hold the eyepiece in place. This might be more of a problem when the direction of the focuser is working more against gravity.

When you choose a focuser, you will need to consider the "focus travel", also known as "Draw Travel", which is the total distance an inserted eyepiece moves in, and out, of the focuser housing as a result of turning the focus knob on the focuser.

Some astronomers prefer our draw tube compression ring system as a way of holding the eyepiece in the focuser rather than the standard nylon tipped screws. The compression ring allows for a more secure hold for the eyepiece by utilizing the surface area of the ring. Another option you may wish to consider is the internal brake system which allows the focuser to hold heavier loads. While not usually required on Newtonian scopes, you may wish to consider it if you'll be using heavy eyepieces and equipment or if the focuser is positioned on your telescope vertical to the ground.

Base plates are mounted on a Newtonian (or Dobsonian) style telescope to hold the focuser in place. Your choice of base plate depends mainly on the surface characteristics of your telescope. Is the place you're going to mount the base curved or flat? If it's curved, as in the case of a tube design, you'll likely need either our Customized Curved Base or our Customized Curved Leveling Base. In both of these cases you will need to supply us with the outside diameter of the tube upon which you'll be mounting the base. If the place you'll be mounting the base is flat, you'll likely choose either our Standard Flat Base or our Standard Flat Leveling Base. Leveling bases, whether flat or curved, assist in the adjustment and collimation of the focuser. FeatherTouch® focusers can be detached from Starlight Instruments' bases.

Adaptors are used in conjunction with a focuser to allow more flexibility with respect to eyepiece choice. Our adaptors are available in three types: Low Profile, Easy Grip, and Standard. Each one has characteristics that you may wish to consider and all accommodate standard 1 1/4" diameter eyepieces.

The Starlight FeatherTouch® focusers recommended for Newtonian-style telescopes have draw travel lengths of 1.5", 2.0", and 2.5".

shuimouzi 寫:是吗，恭喜！！有需要找社长。

HANS 寫:社长 我想问一下那个适合2寸的牛反的调教座 ，我想订购一个 ，接口最好 也是2寸的，请社长给各连接

谢谢