I have a Hardin DSH 10" I replaced the original focuser with this expensive new hardware and I don't have enough travel backwards to focus. the best I get is a big donut.Any suggestions on a fix or should I go back to stock set up?
JMI dx-2 CRAYFORD STYLE FOCUSER
Started by girard35, 04/24/2004 01:02PM
Posted 04/24/2004 01:02PM
Opening Post
Posted 04/24/2004 01:36PM
#1
Richard, Can you move your mirror cell back any? Sounds like your focal plane may be a bit further out than it needs to be. You'll get a better illuminated field if you can move the mirror back, or the diagonal mirror forward. (but that would require you to cut a new hole for the focuser)
Of course the simplest route is just a drawtube extension.
DR
Of course the simplest route is just a drawtube extension.
DR
Darian R.
Posted 04/24/2004 02:15PM
#2
Richard,
You have run into the problem that occurs when you replace a high profile focuser (3.5" tall) with a low profile one (1.5" tall). You need to make up that 2" somewhere. There are 3 options:
1. Longer draw tube
2. A custom base under the focuser to make it 2" higher
3. A 2" extension tube
3 is the easiest since the focuser is installed.
Tom
You have run into the problem that occurs when you replace a high profile focuser (3.5" tall) with a low profile one (1.5" tall). You need to make up that 2" somewhere. There are 3 options:
1. Longer draw tube
2. A custom base under the focuser to make it 2" higher
3. A 2" extension tube
3 is the easiest since the focuser is installed.
Tom
Funding Member
