jrbarnett
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Article idea coming to fruition...3" scope?
#5302659 - 07/04/12 05:36 PM
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Now that my move is done and my old house is sold, I am ready to start in on an article for CN that explores the "golden age" concept (i.e., did the astronomers of yesteryear really have it better than we do, or rather do we tend to irrationally romanticize and idealize the past?). I need to select one or two scopes in the 3" range and one or two scopes in the 6" to 8" range, to uphold the magnificence of modernity in the face of maudlin nostalgia.
Specifically, I will be repeating the historical observations of William Tyler Olcott (3" refractor) and Admiral Smyth (6" refractor) using modern, "affordable" OTAs of similar aperture. I will be observing from my suburban backyard so I won't be benefiting from either pristine per-industrialization Britain skies or rural turn-of-the-century New England skies.
So here's the question for this thread. In the 3" slot what should I go with? I have a recently purchased C90 that I'm thinking to use, but I would also like to include an "affordable" 3-inch refractor. Problem is, I have a 76.2mm Royal Astro achromat and an FS-78 aochromat already. The Royal isn't really "modern", being 40 years old and available only used. The Takahashi is a little more modern, but also isn't presently available new. Used the Royal set me back about $450 with mount and accessories, and the Takahashi, used, goes for about $1000 for the tube, clamshell and maybe a finder. I'm concerned that neither of those scopes satisfies both criteria "affordable" and "modern".
One alternative I'm considering is one of Stellarvue's SV80ST-25SV triplets. It's priced similarly to a used FS-78, but is available new, today, so its certainly modern in that sense. Orion's CF 80mm triplet, too, is a possibility. I'm also open to other suggestions.
The Smyth comparisons will be made using a C6 and a C8 I think, so I'm covered there.
Thanks in advance for your suggestions.
Regards,
Jim
Edited by jrbarnett (07/06/12 01:25 PM)
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Simoes Pedro
sage
   
Reged: 02/03/09
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Re: Article idea coming to fruition...3" scope?
[Re: jrbarnett]
#5302828 - 07/04/12 07:42 PM
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How old would be this Smyth guy? FS-78 should be pretty mordern by comparison.
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JimP
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Re: Article idea coming to fruition...3" scope?
[Re: jrbarnett]
#5302834 - 07/04/12 07:43 PM
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Just my opinion, but I think you should use both 3" and 6" refractors if you want to truly repeat Admiral Smythe and W.T Olcott's observations.
best,
JimP
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JimP
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Re: Article idea coming to fruition...3" scope?
[Re: JimP]
#5302845 - 07/04/12 07:51 PM
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One thing that would be Very helpful would be to give modern catalog numbers/names for the doubles listed in Smythe's Bedford Catalog. Even the recent reprint lists the doubles by their old (no longer used) catalog numbers.
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MRNUTTY
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Re: Article idea coming to fruition...3" scope?
[Re: JimP]
#5302921 - 07/04/12 09:10 PM
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I would rather have their sky's than their telescopes. Even the sky's of my youth.
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Jaimo!
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Re: Article idea coming to fruition...3" scope?
[Re: jrbarnett]
#5302952 - 07/04/12 09:42 PM
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"affordable" and "modern"
You could always go with the Orion ED80, it meets both requirements and is probably one of the most common 3" refractors today. It would make a nice "working man" or "every mans" telescope, similar to what the C8 has become. It could be very inspiring to a less experienced observer.
, Jaimo!
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jrbarnett
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Re: Article idea coming to fruition...3" scope?
[Re: JimP]
#5302967 - 07/04/12 09:54 PM
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Can do, can do, Jim P. At least I think so. Sky Safari has a lot of catalog cross-index data for doubles. Perhaps the designations used in the Bedford Catalogue are covered in that application? I have a pdf of the Bedford Catalogue, but not here at home, so I'm not certain what catalog designations are used by Smyth.
- Jim
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JimP
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Re: Article idea coming to fruition...3" scope?
[Re: jrbarnett]
#5303509 - 07/05/12 10:26 AM
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W. H. Smyth used a lot of his son's catalog numbers, Piazzi Smyth, which are no longer used. It really keeps the catalog from being useful to many observers. Unfortunately, for some unknown reason, George Lovi did not include a list of the doubles with their modern designations in the reprint. :^(
JimP
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jrbarnett
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Re: Article idea coming to fruition...3" scope?
[Re: JimP]
#5303637 - 07/05/12 11:42 AM
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It looks also like Smyth used some Herschel I and Hershel II catalog numbers. Hmm...
So I should temper my enthusiasm a bit and say that when I select my Smyth targets, I'll make certain that at least some of them can be matched to modern catalog designations.
- Jim
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Jon Isaacs
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Re: Article idea coming to fruition...3" scope?
[Re: Jaimo!]
#5303694 - 07/05/12 12:29 PM
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Quote:
Quote:
"affordable" and "modern"
You could always go with the Orion ED80, it meets both requirements and is probably one of the most common 3" refractors today. It would make a nice "working man" or "every mans" telescope, similar to what the C8 has become. It could be very inspiring to a less experienced observer.
, Jaimo!
I second the ED-80.
It marked the beginning of the affordable apo/ed revolution and turned out to be quite an amazing scope. When it was first introduced, I was quite the skeptic, thinking it would be just another scope with ED on the name plate but achromatic performance at the eyepiece. But history has proven me wrong... It's a winner and $300 will often buy one used.
Jon
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Sean Puett
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Re: Article idea coming to fruition...3" scope?
[Re: jrbarnett]
#5304010 - 07/05/12 04:14 PM
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I think this article is a good idea. I bet the old long 3" scopes give the modern scopes some real competition, if not beat them. Getting similar mags and fields of view with eyepieces of the same design would be tricky for anyone without an eyepiece collection like yours. It will be a good read for sure. Are you going to do similar focal ratios, or go with the modern, faster trend vs old school long achros?
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BillP
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Re: Article idea coming to fruition...3" scope?
[Re: jrbarnett]
#5304071 - 07/05/12 05:16 PM
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(i.e., did the astronomers of yesteryear really have it better than we do, or rather do we tend to irrationally romanticize and idealize the past?).
Jim,
Catch me up on this...exactly how is it proposed they had it better? Not sure what you are testing against? Aperture?
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jrbarnett
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Re: Article idea coming to fruition...3" scope?
[Re: Jon Isaacs]
#5304610 - 07/05/12 11:34 PM
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It's odd, because in the early 90s Orion offered the 80mm f/6.25 ED "Ultrascan" doublet for $449. It was made in Japan, and in 1991 dollars, actually cheaper than the later "revolutionary" Chinese-made ED80 f/7.5. I wonder why it took a cheaper made, more costly scope to start that particular revolution?
- Jim
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iceblaze
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Re: Article idea coming to fruition...3" scope?
[Re: jrbarnett]
#5304767 - 07/06/12 01:59 AM
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Why not throw your AT72ED in?
-James
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Jon Isaacs
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Re: Article idea coming to fruition...3" scope?
[Re: jrbarnett]
#5304926 - 07/06/12 07:22 AM
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It's odd, because in the early 90s Orion offered the 80mm f/6.25 ED "Ultrascan" doublet for $449. It was made in Japan, and in 1991 dollars, actually cheaper than the later "revolutionary" Chinese-made ED80 f/7.5. I wonder why it took a cheaper made, more costly scope to start that particular revolution?
- Jim
Jim:
I believe the Ultrascan was similar to the other 80mm F/6.25 "ED" scopes of the era, the UO for example, I think Apogee had one there for a while. Like the Pronto, they used "ED" glass but they offered no better color correction than a standard achromat.
"Note one interesting glass that was touted some years ago as a "semi-ED" glass, which is FK5. "FK" is the Schott designation for Flour-crown, and this type of glass has some fluorite in it, but in this case not much at all. In any case, as you can see, there really are no mates far enough separated in dispersion (Vd) that would produce any sort of meaningful color correction, any better that the plain vanilla BK7-F4 variety."
Roland Christen (Astromart)
Pronto Color Correction (Astromart)
It was actually scopes like the Ultrascan that made me skeptical that the Orion ED would provide the sort of performance it did, Orion had done it before, sold an affordable scope as an "ED" scope but in reality it was a well made achromat.
The reason it took the $500 ED-80 to start the revolution was that it really was revolutionary, it used quality ED glass, FPL-53 and it really did provide the near perfect color correction that one expects of an apochromat. It was a poorman's TV-85 and opened up the world of affordable apochromats.
Jon
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jrbarnett
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Re: Article idea coming to fruition...3" scope?
[Re: iceblaze]
#5305320 - 07/06/12 12:36 PM
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Too small for the 3-inch class. Oh, and it's pink. 
- Jim
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JimP
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Re: Article idea coming to fruition...3" scope?
[Re: jrbarnett]
#5305870 - 07/06/12 06:45 PM
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Have you considered the doubles in "pleasures of the Telescope" by Garrett P. Serviss? He uses 3", 4" and 5" achromatic refractors for his descriptions of doubles. Published around 1909 as I recall.
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astroneil
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Re: Article idea coming to fruition...3" scope?
[Re: jrbarnett]
#5305954 - 07/06/12 07:47 PM
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Hello Jim,
What 3" instrument to choose? Doubtless, a very difficult question to answer.
May I offer the following line of reasoning?
Dedicated observers living in Olcott's time strove to acquire the finest equipment they could reasonably afford.
The cost of even a decent 3" instrument, complete with a nice selection of eyepieces and a sturdy mount, either equatorial or Alt-Azimuth, would have likley set the purchaser back a sizeable fraction of their annual income-even, I believe, for a lawyer like Mr. Olcott.
Thus,one might legitimately choose the finest 3" available today as a worthy comparison, sic a triplet apochromat on a sturdy mount, accompanied by the best eyepieces money can buy.
Likewise, your TEC 140 would probably serve as a worthy 'equivalent' to Admiral Smyth's instrument.
My two cents.
Best wishes,
Neil.
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GeneT
Ely Kid
   
Reged: 11/07/08
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Re: Article idea coming to fruition...3" scope?
[Re: jrbarnett]
#5306014 - 07/06/12 08:32 PM
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do we tend to irrationally romanticize and idealize the past?
Jim,
We do exactly that. I grew up in Ely, Nevada and left after graduating from high school. I have locked Ely in my memory bank and idealized my living there. Had I stayed there during my adult life, I am sure my romantic ideals of the place would be better based on reality. One thing about Ely--I had better than Mag 6 skies in my back yard. I owned a 4 inch Dynascope that I worked all summer mowing lawns to buy for $79.95. People in Ely did not have much money, so even an inexpensive telescope was out of reach for many of us. When I think back to more than 55 years ago, and remember the views through that little telescope, I remember sharp views of Jupiter, Saturn, the moon, and some brighter deep sky objects. I have often wondered what I would think of the views today had I kept that telescope. Yes--we do romanticize the past. In some ways, I am glad that I have only the memories of my views through my first telescope. What if I had kept that telescope? I would be comparing the views with my later telescopes, to include my current one--a 12.5 inch Portaball. Maybe if I had kept that first telescope, my memories of those early views in my backyard in Ely would not be all that great. I have been tempted to buy a 4 inch Dynascope on the used market--but I have decided to just live in the romantic time of my youth. I am now 69--those memories are precious.
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jrbarnett
Eyepiece Hooligan
   
Reged: 02/28/06
Loc: Petaluma, CA
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Re: Article idea coming to fruition...3" scope?
[Re: GeneT]
#5306092 - 07/06/12 10:12 PM
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"What if I had kept that telescope?"
I have my second telescope (a Meade 628C) and several proxies for my first, a Jason 60mm f/11 achromat (in the form of some Carton 60mm f/16.7s and a Sears/Towa 60mm f/15). My purpose for retaining my early telescopes or equivalent was exactly that - to see if my perception of such instruments change with time and experience.
If anything, my experience with examples of most every design of visual use telescope, and apertures far and away above the 6" and 2.4" scopes of my youth, has taught me newfound respect for these old goats. Long focus achromats and slowish Newtonians are virtually idiot proof scopes that aren't finicky about collimation, cool quickly and deliver much more of their (admittedly modest) potential every night than will larger and/or faster scopes.
Conversely, though, if I'd eschewed trying new scopes, and stuck with these old saws, I'd be poorer for it. The larger Universe of available data addressed by a larger aperture, and the techniques that large and varied portfolio of targets teaches, have application with the smaller instruments too. It's like Herschel said; once a target is seen in a larger telescope, it's easier to find in a smaller telescope.
If anything, the comparison of the old scopes head to head with the new enhances our esteem for simpler times and simpler gear. That said, I won't lose any sleep if ai conclude that amateur astronomers have it a whole lot better now than they did 50 years ago. 
Regards,
Jim
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