Quote:

---

I know you need high power to collimate the SCT. My hightest power EP is my 13mm Nagler T6. In my scope's case, that's only 192 power and I'm not sure it's enough.

My Lx200 is great. The images however are not as good by a long shot, as when it was new 15 months ago.

Collimation with the knobs is easy and I have it close...probably very close. When I put my ST402 camera in the scope it displays good collimation outside of focus.

I got a Howie Glatter Laser Collimator tool and when I tried it, the reflection went right dead-center down the middle of the tool. That indicates great adjustment.

So can I use a barlow to double the power of my 13 Nag and perhaps get better adjustment? Or put it in front of the SBIG camera (dont know if it will focus) to try/

I'd love to get Lexie to show me the same quality she showed me in the beginning - and she's not even a year & half old.

---

Hokay...first off, forget using the laser to collimate the SCT. It will probably be worse than useless. Most of the time, using a laser on a CAT is a recipe for MIScollimation.

A barlow would work fine, especially if you are attempting in-focus collimation.



--------------------
Uncle Rod

Watch for Rod's New Book:
Choosing and Using a New CAT--coming in December!

Post Extras:

Quote:

---

Thanks Rod. Wasn't it in one of your publications, that I read you need to focus an SCT on the OUTside of focus?

---

Post Extras:

Quote:

---

A barlow would work fine, especially if you are attempting in-focus collimation.

---

Let me see if I got this right

When using very high power (barlow), in-focus is best (no rings?)

At low or medium powers, use either INside or OUTside OF focus to get the best concentric first ring.

Is that kinda/sorta what we're saying?

Thanks, Rod

--------------------
Don

"Don't worry about what telescope you own, or its quality. Just get out under the night sky and enjoy God's wondrous universe" Thomas Back.

Post Extras:

Quote:

---

Let me see if I got this right

When using very high power (barlow), in-focus is best (no rings?)

At low or medium powers, use either INside or OUTside OF focus to get the best concentric first ring.

Is that kinda/sorta what we're saying?

Thanks, Rod

---

As the rent-a-car ad used to say, "Not Exactly"...

Use as much power as you need to make it easy to see diffraction rings. If they look better at high power, use that.

For infocus collimation? Yes, you will need 300x plus. Alas, in many areas infocus collimation is rarely possible.



--------------------
Uncle Rod

Watch for Rod's New Book:
Choosing and Using a New CAT--coming in December!

Post Extras:

Quote:

---

Quote:

---

Let me see if I got this right

When using very high power (barlow), in-focus is best (no rings?)

At low or medium powers, use either INside or OUTside OF focus to get the best concentric first ring.

Is that kinda/sorta what we're saying?

Thanks, Rod

---

As the rent-a-car ad used to say, "Not Exactly"...

Use as much power as you need to make it easy to see diffraction rings. If they look better at high power, use that.

For infocus collimation? Yes, you will need 300x plus. Alas, in many areas infocus collimation is rarely possible.

---

Thanks, Rod

--------------------
Don

"Don't worry about what telescope you own, or its quality. Just get out under the night sky and enjoy God's wondrous universe" Thomas Back.

Post Extras: