[DavidP (David)]

Need help/advice,

I am using a Celestron 102SLT (achro refractor), and upon advice from this community have now purchased a zoom lens that I am extremely happy with. Thanks.

I am now considering upgrade of the provided Celestron 1.25inch star diagonal (prism), to a 2inch variety, and need advice as to whether or not an improvement will be evident with a quartz mirror diagonal.

The reason, I seek your advice is that I have read articles that state:

"Assuming the same quality of manufacture, prisms give less light scatter, a good thing. And unlike a mirror, they are also self collimating. But they also create false color in scopes with fast focal ratios"

But have also read atricles to the contrary indicating that the prism is used to add correction to the false colour. Interestingll, it appears that were of use in ED refractors...........hmmmm........t hought that they prodced no false colour in the first place...........oils aint oils and obviously EDs aren't EDs.

Therefore in my F6.5 scope (fast?) was the prism diagonal (as supplied) beneficial to the scope's overall performance, or would that be otherwise enhanced in the adoption of a 2inch quartz diagonal?

Thanks in advance for any advice offered.


David