Re: [tmboptical] Re: TV-102 vs "TMB130LW" size comparison?
- Hi Ron:
>- Nearly everyone says the biggest improvement is from a 4" toWhile I agree that a 6" will show you more than a 5" I think you need to go
>5" (of course 4" to 6" would be more ;-) than from 5" to 6".
with what will work best for you. If a telescope is too big and bulky for
you to set up you won't use it very often. As John Dobson once remarked:
"If a telescope can fit into your backyard it's too small. If you can't move
it, it's too big." ;-)
Plus, I have found that a 5" is capable of showing very fine detail. These
are a sampling of sketches I made of Saturn, Jupiter, Mars, deep-sky, and
comets made with a 5" refractor on homemade Dobsonian-style mount:
Saturn showing spokes in the B-Ring:
Saturn showing spokes in the A-Ring:
Jupiter ovals, columns, festoons, bays, red barges,
M1 and Saturn:
As you have noted when making your Mars sketches the more you observe and
sketch the more you train your eye to see more detail. Plus the more you
observe the better the chances you will get good seeing.
Another way to look at the aperture of a telescope is to approach it not
from the standpoint of that it is "Gee its only a 5" so I won't be able to
see as much as a larger aperture telescope" but rather "What will I see
tonight". That way your aren't limiting yourself before you even begin
Finally, as to only wanting to have one telescope for observing (like when
you only had your Light Cup) or how it perform vs. your 8" Dob I think every
telescope has its advantages and disadvantages. You just have to decide
what is most important for you in terms of performance, cost, ease of use,
and portability. To some extent the aperture of the telescope is less
important than the person using it.
Hope this helps,
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- --- In firstname.lastname@example.org, "etherealnumber99" <ratboy99@a...>
> Hi Ron,Thanks Bill for a great tip and a very drooling price tag ;-)! Alas,
> A "new" Tak FS-152 - 6" F8 APO just showed up on Amart...
> That's like $3,000 less than current retail...
> I would imagine that you would be able to sell it for at least the
> same down the road, just "park" the money in it for a few years,
> won't cost you a dime.
there ain't a FS-152 f/6 sizewise ;-(, is there? But I just remember
that I'll need probably the monsterous G11 (no budget for this) and
that I already asked Thomas last week to go away and expedite cashing
in my deposit check ;-).
Ron the 4+1" Tall Evangelist B[ee]