I'm going to be trying something new here and I need some advice or an opinion or two.
Let's say that you were hooking up a....are you ready for this? A 1540mm f/12 lens to your camera. We're talking a fixed aperture lens...it's f/12 and that's it. Now lets say that you were planning on taking this rig out to a local lake on a fairly sunny day to shoot...I dunno...birds and such. Since it's a fixed aperture and since you'd obviously be shooting in manual, where would be a good place to start with a shutter speed at this combination?
If you haven't guessed, yes, I'm hooking up my Orion 5" Mak telescope to the front of my Rebel XT. My sis-in-law sent me a $20 B&H Photo gift card for the holidays so I went ahead and ordered a T-adapter for the camera. It's been forever since I learned the old manual stuff and the last few years with the "newer toys" I've been shooting pretty much in Aperture Priority mode anyways so I don't really remember the mathematical relationship between shutter speed and aperture (assume we're talking about an ISO 100 for starters). I could probably look this up somewhere on the net, but hey...it's easier to ask
My original intent with this was to try my hand at some long exposure astrophotography stuff, but I still need to get a motor for my eq mount before I try that. In the mean time, I figure it's not going to hurt anything to try a little "terrestrial" shots as well. I've seen a few articles here and there of people who have been "digi-scoping" with decent results and this is sort of the next step. This telescope has always been really decent from an image point of view...at least from an astronomical stand point compared with other scopes I've looked thru.
We're supposed to be in for some nasty weather here for a few days, so I probably won't get a chance to test this out until next week, but when the weather clears up, I'm planning out heading out to a (semi) local water foul lake. Being an f/12 and being such a looooooooooooong focal length, I know
I'm going to need some good lighting. Being a digital, I could (and very well may) dink around with things until I find a good setting but if anyone could offer a fair starting point as well as any other useful tips, I'd be grateful!