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Space Forum / Astronomy / December 2007digital photo's using eye piece projection question
I have a 5 year old Meade etx 90 go to scope and have had a great deal of enjoyment using it. I'd like to take some photos of a few things using a canon digital camera using eye piece projection. I have a few questions, 1. what is the highest magnification eye piece that can be used with this configuration? 2. should the eye pieces be the highest field of view possible? 3. Is there any software available that will allow me to sum multiple photos into one photo that simulate long exposures? Thanks any hints or tips welcome. >I have a 5 year old Meade etx 90 go to scope and have had a great deal > of enjoyment using it. I'd like to take some photos of a few things [quoted text clipped - 11 lines] > > Thanks any hints or tips welcome. 'Lo Modat22 -- There are a few people who read this newsgroup who are amateur astronomers and who can help you with your questions. But because of the high amount of "noise" here, they may not look in very often. So you might try a different newsgroup... sci.astro.amateur I just looked in, and while it also seems to be a bit noisy, there are probably more people reading sci.astro.amateur who can answer your questions, and who read and post there more often. HTH happy new-year days and... starry starry nights!  SignatureIndelibly yours, Paine P.S. Thank YOU for reading! P.P.S. (shh) Some secret sites... http://painellsworth.net http://savethechildren.org http://home.secretsgolden.com > I have a 5 year old Meade etx 90 go to scope and have had a great deal > of enjoyment using it. I'd like to take some photos of a few things [quoted text clipped - 11 lines] > > Thanks any hints or tips welcome. Since a maximum magnification for any aperture (ignoring atmospheric distortion) is approx. 2 x aperture (in mm), you'd have a max of around 180 for the 90mm ETX. As magnification is derived by dividing OTA focal length by eyepiece focal length [OTAfl / EPfl = mag], for the ETX that is [1250 / x = 180, or 6.944444444] but in practice I found with mine that the 9mm was excessive most of the time. I would think that you'd pick an EP with a AFOV that matched what you were trying to photograph... There are a number of applications that are available, but the most common (general purpose, as opposed to those sold specifically for astro cameras) I've seen is Registax. Meade has an excellent discussion of Power @ http://www.meade.com/support/ power.html |
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