Comments for TelescopeLenses.org http://www.telescopelenses.org Wonderful Telescope Lenses Wed, 26 Oct 2011 08:40:12 -0600 http://wordpress.org/?v=2.9.2 hourly 1 Comment on Where can I buy telescope lenses? by Search first before you ask it http://www.telescopelenses.org/where-can-i-buy-telescope-lenses/comment-page-1/#comment-13118 Search first before you ask it Wed, 26 Oct 2011 08:40:12 +0000 http://www.telescopelenses.org/where-can-i-buy-telescope-lenses/#comment-13118 This outlet may have what you want: http://www.surplusshed.com/ This outlet may have what you want:

http://www.surplusshed.com/

]]> Comment on Where can I buy telescope lenses? by GeoffG http://www.telescopelenses.org/where-can-i-buy-telescope-lenses/comment-page-1/#comment-13117 GeoffG Wed, 26 Oct 2011 07:43:53 +0000 http://www.telescopelenses.org/where-can-i-buy-telescope-lenses/#comment-13117 Back when I was a teenager 50 years ago there were several stores which sold lenses like these, but there is so little demand nowadays that they are really hard to find. You certainly won't find one local to you, but will probably have to order over the internet, and settle for something somewhat different than the specifications you mention. Sorry, but you were born 50 years too late. Good luck! Back when I was a teenager 50 years ago there were several stores which sold lenses like these, but there is so little demand nowadays that they are really hard to find. You certainly won’t find one local to you, but will probably have to order over the internet, and settle for something somewhat different than the specifications you mention.

Sorry, but you were born 50 years too late. Good luck!

]]> Comment on Where can I buy telescope lenses? by D http://www.telescopelenses.org/where-can-i-buy-telescope-lenses/comment-page-1/#comment-13116 D Wed, 26 Oct 2011 06:45:48 +0000 http://www.telescopelenses.org/where-can-i-buy-telescope-lenses/#comment-13116 I'm not sure where you would get lenses like that with such odd configurations...49mm? That's not a standard size for anything. zxc I’m not sure where you would get lenses like that with such odd configurations…49mm? That’s not a standard size for anything.

zxc

]]> Comment on Does a refracting telescope with converging lenses make an upright image? by speedofaether http://www.telescopelenses.org/does-a-refracting-telescope-with-converging-lenses-make-an-upright-image/comment-page-1/#comment-8806 speedofaether Sun, 19 Jun 2011 16:07:38 +0000 http://www.telescopelenses.org/does-a-refracting-telescope-with-converging-lenses-make-an-upright-image/#comment-8806 The telescope kit you bought is most likely a Keplerian type. If all that you have are two lenses that are both positive (converging) then you would have an inverted image. Unless the kit comes with a Porro prism or an Abbe roof prism then the image will actually be upright. The telescope kit you bought is most likely a Keplerian type. If all that you have are two lenses that are both positive (converging) then you would have an inverted image. Unless the kit comes with a Porro prism or an Abbe roof prism then the image will actually be upright.

]]> Comment on Does a refracting telescope with converging lenses make an upright image? by GeoffG http://www.telescopelenses.org/does-a-refracting-telescope-with-converging-lenses-make-an-upright-image/comment-page-1/#comment-8805 GeoffG Sun, 19 Jun 2011 15:56:14 +0000 http://www.telescopelenses.org/does-a-refracting-telescope-with-converging-lenses-make-an-upright-image/#comment-8805 A telescope made with two converging lenses would have an inverted image. Can't you see that? A telescope made with two converging lenses would have an inverted image. Can’t you see that?

]]> Comment on A telescope has lenses with focal lengths 1000mm and 40mm. What is its magnification? by Pearlsawme http://www.telescopelenses.org/a-telescope-has-lenses-with-focal-lengths-1000mm-and-40mm-what-is-its-magnification/comment-page-1/#comment-6827 Pearlsawme Fri, 01 Apr 2011 22:14:20 +0000 http://www.telescopelenses.org/a-telescope-has-lenses-with-focal-lengths-1000mm-and-40mm-what-is-its-magnification/#comment-6827 Magnification m= -fo/fe where fo >fe Magnification m= -1000/40 = 25 ````````````````````````````````` The angle subtended when viewed through the telescope is 0.5*25 = 6.25º ====================== Magnification m= -fo/fe where fo >fe

Magnification m= -1000/40 = 25
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The angle subtended when viewed through the telescope is 0.5*25 = 6.25º
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]]> Comment on John cena Titantron by ohmyfuckengosh http://www.telescopelenses.org/john-cena-titantron/comment-page-1/#comment-6176 ohmyfuckengosh Sat, 08 Jan 2011 21:37:28 +0000 http://www.telescopelenses.org/john-cena-titantron/#comment-6176 this isnt even 2009 this is OLD this isnt even 2009 this is OLD

]]> Comment on John cena Titantron by thedoofinator http://www.telescopelenses.org/john-cena-titantron/comment-page-1/#comment-6175 thedoofinator Sat, 08 Jan 2011 21:10:24 +0000 http://www.telescopelenses.org/john-cena-titantron/#comment-6175 this isnt 09 this isnt 09

]]> Comment on John cena Titantron by pimpincmadddog http://www.telescopelenses.org/john-cena-titantron/comment-page-1/#comment-6174 pimpincmadddog Sat, 08 Jan 2011 20:11:44 +0000 http://www.telescopelenses.org/john-cena-titantron/#comment-6174 what are you talking about, where did you get that from what are you talking about, where did you get that from

]]> Comment on what’s the difference between these two telescope lenses? by GeoffG http://www.telescopelenses.org/whats-the-difference-between-these-two-telescope-lenses/comment-page-1/#comment-5638 GeoffG Wed, 15 Dec 2010 07:56:01 +0000 http://www.telescopelenses.org/whats-the-difference-between-these-two-telescope-lenses/#comment-5638 These are not "lenses"; they are erecting prisms. You insert them in between your telescope's focuser and your eyepieces. Both convert the normally inverted telescope image to an erect image. With the 90° version you look into the telescope from above, 90° to the optical axis of the telescope. With the 45° version, you look in at a 45° angle. These are not “lenses”; they are erecting prisms. You insert them in between your telescope’s focuser and your eyepieces. Both convert the normally inverted telescope image to an erect image. With the 90° version you look into the telescope from above, 90° to the optical axis of the telescope. With the 45° version, you look in at a 45° angle.

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