Image of the day

Captured by

M 81

My Account

New to Astromart?

Register an account...

Need Help?

FS-128 - flourite vs triplet

Started by adamsdp, 03/21/2004 08:04AM
Posted 03/21/2004 08:04AM Opening Post

I am thinking of getting a used Tak 128 and am wondering about the flourite element. I have read references to flourite being fragile and was wondering what this means in regards to use. Do you have to be careful in that it may crack due to impact, cleaning or will it degrade over time?

I live in Michigan and like that the Tak has only 2 elements and wonder if this would be an advantage over a triplet in cool down times and thermal stability? Also, I have always wondered if there are any problems with oil spaced triplets leaking oil over time? Thanks.

Dave Adams
Posted 03/21/2004 09:30AM #1

Don't worry too much about the flourite element. I've not heard of a single report of a flourite element breaking in normal use. Flourite is soft and care should be taken if you need to clean the element to prevent scratching. Most manufacturers put the flourite element as the rear element or in the case of a triplet, the inside element. Flourite is also more easily damaged by moisture so be sure not to close the scope up tight on a dewy night.

Really, if you treat this scope with reasonable care, you shouldn't have any problems.

As for oil spaced triplets leaking. Mine's nearly 20 years old and hasn't lost a drop!

Tom M

Clear, sunny skies.
Tom Masterson
Coronado-Lunt-Daystar Solar Filters forum Moderator
Posted 03/22/2004 01:50PM #2
Search the UncensoredTakGroup on Yahoo, there is a huge archive about these issues.