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• View topic - Advantages of 18 inches over 12 inches

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PostPosted: Sun Jun 13, 2010 9:58 am 
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Last edited by Talyn on Mon Jun 14, 2010 5:36 am, edited 1 time in total.

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49.6 mpg avg over 38,000 miles. 177% of '08 EPA
Best flat drive 94.5 mpg for 9.8 mi
Best tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg


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Ah, but I was so much older then.
I'm younger than that now
Bob Dylan


49.6 mpg avg over 38,000 miles. 177% of '08 EPA
Best flat drive 94.5 mpg for 9.8 mi
Best tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg


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PostPosted: Sun Jun 13, 2010 7:16 pm 
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Feeling sorry for you...hating your guts...it's all the same, right? :razz:

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Single ride personal records: Distance-76.7miles, Max Speed-50.4mph, Max sustained speed (20miles) 19.5mph
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PostPosted: Mon Jun 14, 2010 7:40 am 
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Re. 16" over 12", that's as much as I thought. There's a guy on CN who swears that a 16" offers no advantage over 12" and I didn't think that was right.

Snorkler, how much do you want for the 18"?

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PostPosted: Mon Jun 14, 2010 9:10 am 
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Definitely go with the 18" in this case since you are moving up from a 12. Not only brightness but resolution will be better, and the weight and bulk difference between the 16 and 18 isn't that much.

In addition you will go a full magnitude deeper for every 254% increase in surface area. In this case the 18 is about 225% so you are getting .89 magnitudes deeper over your 12 vs. about 0.7 if you went with the 16. The amount of stars visible from one magnitude to the next are exponential so it opens up a hell of a lot more sky at the eyepiece than your 12. The 18 has an additional .2 mags over the 16, which wouldn't blow you away, but it could make the difference in detecting faint galaxies or seeing a little more at the threshold.

The guy on CN who says a 16 doesn't offer any real advantage over a 12 is probably looking, rather than observing. There is a noticeable difference. It might not be the knock-you-socks-off difference you get from a 12 to a 20, but there is a noticeable increase in the amount of information available to you in the 16.

In this case, I think the 18 would be a great way to go for you if you have no issues with moving the scope. Good luck!

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PostPosted: Mon Jun 14, 2010 6:06 pm 
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Faith,

Asking $4,500 USD. It has DSCs and Servocat installed, but I can't find the Argo-Navis controller. Groundboard driven by Servocat has one flat spot that may need rebuilding.

It's f/4.2, nice and short, so I never have to climb more than 2 steps on the ladder.

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Ah, but I was so much older then.
I'm younger than that now
Bob Dylan


49.6 mpg avg over 38,000 miles. 177% of '08 EPA
Best flat drive 94.5 mpg for 9.8 mi
Best tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg


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PostPosted: Wed Jun 16, 2010 11:01 am 
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molecule
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That's quite a bit more than the one I can buy over here, which does not include shipping and import duty (although I am not sure that a second hand scope would attract import duty - although knowing UK Customs, that's entirely possible).

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PostPosted: Wed Jun 16, 2010 2:22 pm 
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quasar
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Glad to hear you can get a scope like that so reasonably. I think of UK optics prices as typically the same numerical value as our US dollar price, but in Pounds, which makes your cost ~70% higher.

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Ah, but I was so much older then.
I'm younger than that now
Bob Dylan


49.6 mpg avg over 38,000 miles. 177% of '08 EPA
Best flat drive 94.5 mpg for 9.8 mi
Best tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg


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PostPosted: Thu Jun 17, 2010 6:45 am 
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molecule
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