hi i have an eos40d that i would like to use for astrophotography, it power up ok attached telescope adaptor and focus ok through live view but when taking pic it faults out error99. i have tried google search step, like memcard change, secondary battery change, leaving it powered off battery removed im using mains fed to replaced standard battery. any info would be appreciated regards theo
Welcome to the Forum Theo, I have little experience in this area but may I suggest you check that the camera is not the problem, put on a lens and use that, any lens will do. If no error occurs then move on to the next thing you attached to the camera. If error occurs then the camera is showing it's age. Lastly Johnsey may be the best one to ask, or Caladina and GDN (Gary) as they are also very switch on in this area.
Hi Craig Thanks for reply and info unfortunately i dont have a lense for it as has a telescope adaptor i will try find tha member you mentioned for more info Regards theo
I think I would look at the telescope adaptor next - is it a Canon-compatible item? When you take a picture, the camera sends signals to the lens to close down the aperture etc. - if your adapter does not correctly mimic a canon lens, the camera may not get the right confirmation signals back, which would give Error 99. Beg borrow or steal a Canon lens and try the camera with that - it should at least tell you if the camera itself is OK.
Definitely agree with John here, you need at least a cheap canon lens to make sure it is working correctly as a camera. Did this just start happening or did you just put the kit together and realize your setup is not working as you wanted it to. he think is the 99 error is rather generic, it could be a communication problem with the adapter on the mount, which could be adapter or camera mount contact as the problem, or even a battery or memory card going bad (or the cameras contacts with these items). So it is something where you need to get it to a working state so you can isolate which one is the problem. The plus side is if you invest in a modest priced lens like an EF 50mm 1.8 you can use that on any canon DSLR you use. Our guess is it is an issue with the adapter, but to be fair you camera is 15 years old so any of the above issues could be a problem.
Hello and welcome to the forum Theo. I don't think that there is anything wrong with your camera. But the problem that I think that you are facing is that there is no lens attached to your camera, or the camera thinks that there is no lens attached. If this is the case, there is a work around that you can do. You will need to dive into the menu of your camera, and you are looking for an option along the lines of 'release shutter without lens'. Enable that, and you should be good to go. I don't know where this exact option is though, you may have to do a little digging around on the net Hope this helps, and let us know how you get on. Gary
