|
Ben, a nice shot for your first attempt with this setup. I have the same scope and I find the Carina nebula a little too large for the 1000mm focal length There's lots of nice whispy bits of nebulosity and colourful stars you're missing out on. The ED80 will give you a nicer crop but of course, less detail. I guess it's all about what you're trying to achieve. It's a bit like painting a scene regarding colour balance and field of view, we all have our opinions.
At f7.5 you're going to have to increase your time more than double to achieve the same exposure at f5. Not sure what iso you were running at but the alternative is to increase the time a bit and double your iso setting. Noise will increase but you can compensate this by doing more subs.
The ED100 will give you more detail than the f5 reflector so if you're happy with the 1000mm cropping you will get a better result. By the way, good work on moving your mirror up, it can be a bit daunting for some to do this, looks like you've done a good job.
|