Chaz2b Posted August 12, 2022 Share Posted August 12, 2022 Is there any other product out there that is similar to Televue powermates? Or is that it and all others are Barlows? Chaz Link to comment Share on other sites More sharing options...
Zermelo Posted August 12, 2022 Share Posted August 12, 2022 It depends what you mean by "similar". There are certainly other makes of telecentric multipliers, e.g. https://www.firstlightoptics.com/barlow-eyepieces/explore-scientific-2x-3x-5x-barlow-focal-extender-125.html Whether they are as good is another question. Link to comment Share on other sites More sharing options...
Zeta Reticulan Posted August 12, 2022 Share Posted August 12, 2022 I think there is a distinction between a telenegative Barlow type of lens and a multi-element (usually four element) amplifier. An amplifier won't increase the eye relief in use and is often designed to produce a flatter field than a more traditional Barlow. In use, I find no real difference in quality between this 3x 'Altair tele extender' and my 2.5x and 5x TeleVue Powermates. 1 Link to comment Share on other sites More sharing options...
Don Pensack Posted August 12, 2022 Share Posted August 12, 2022 I think 3 companies have had 4 element telecentric Barlows: Tele Vue Optics, Harry Siebert Optics, and Jing Hua Optical( sold as Meade, Explore Scientific, Altair, and others). There may have been others, but I am not aware of them. 2 Link to comment Share on other sites More sharing options...
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