Important Note: - Before ordering this item, please make sure you can unscrew the stock focuser from your telescope tube. To use a finder, you will have to mount a finder bracket directly on the telescope tube, or you can mount it on the GSO focuser body using a special dovetail base (sold separately).
#Agena astro gso focuser upgrade#
If you upgrade your stock C100ED focuser, note that you will loose the built-in finder base on the stock C100ED focuser body when you remove it. On the flip side, our configuration will provide 7mm less of back-focus travel compared to the stock focuser but this is easily remedied with an extension tube, if necessary.
#Agena astro gso focuser plus#
Relative to the stock R&P focuser, the GSO Dual-Speed Crayford/Agena Adapter combination will allow 22mm of additional in-focus travel which is a plus for imaging applications. It is precision CNC-machined from aluminum and anodized black to match the surface finish of the C80ED tube. This adapter will work with GSO's single or dual speed Crayford focusers that have an 86mm flange/base plate (focuser sold separately).
This upgrade will turn your C100ED telescope into the little beauty it was meant to be. The only tool you need to provide is a Philips (cross-head) screwdriver. Installation is easy - just unscrew the stock R&P focuser from the Celestron C100ED tube, screw this adapter into the tube in its place, slide the GSO focuser into this adapter, and bolt it to the adapter using three M4 screws (included with the adapter). However, with Agena's new coupling adapter for the Celestron C100ED, you can now attach the very affordable and excellent 86mm GSO Crayford focuser to the C100ED in a few minutes. For those looking to upgrade the focuser, the only alternative until recently was to upgrade to a competing Crayford focuser + adapter costing over $300 - over half the cost of the entire telescope itself! Unlike 95% of the other telescopes in the market, the focuser does not bolt to the tube. Complicating the matter further is the fact that the stock focuser screws into the rear of the telescope tube.
However, owners have long complained of the poor quality of the telescope's stock R&P focuser as its weakest point. The Celestron C100ED refractor is an excellent telescope.
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