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Difference between 25" and 30"

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54 replies to this topic

#51 MeridianStarGazer

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Posted 26 July 2021 - 09:09 PM

As mentioned before, very large telescopes are notoriously know to preform poorly in light polluted skies. Bortle 5 is far from being ideal. ...

They don't perform poorly. They just under-perform. They show more than a small scope would, but not enough more to be worth the extra hassle. At a dark site, it is worth the extra hassle.



#52 Keith Rivich

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Posted 26 July 2021 - 10:38 PM

They don't perform poorly. They just under-perform. They show more than a small scope would, but not enough more to be worth the extra hassle. At a dark site, it is worth the extra hassle.

I wouldn't quite call it under performing unless you are comparing the scope, no matter the aperture, with itself between a dark site and a bright site.  My 25" greatly out performs my 18" when used in the same conditions, no matter the conditions.



#53 Allan Wade

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Posted 26 July 2021 - 11:07 PM

I would love to give some 30" and bigger Dobs a go at planets in my steady seeing.

But let me guess, your door is too small. grin.gif


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#54 a__l

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Posted 27 July 2021 - 01:27 AM

In contrast, a 25" f/3 would require only a 1-step stool to use.

And be a heck of a lot easier to transport.

In fact, this is a collapsible design. And there is no value, f/3 or f/3.3 or even slower, until you have a high ladder.



#55 CHASLX200

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Posted 27 July 2021 - 06:00 AM

But let me guess, your door is too small. grin.gif

My house is too small let alone a door.


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