Anyone know anything about this Spectrascope?
Posted 14 May 2007 - 05:58 PM
Posted 14 May 2007 - 05:59 PM
Posted 14 May 2007 - 07:36 PM
Posted 14 May 2007 - 09:05 PM
Well, one person offered me $30, so far. I have no idea, zero, zilch what to ask for this. Maybe I should put it up for auction and let the 'hidden hand of the marketplace' determine the price? (Usually I follow the Fernegi Rules of Acquisition, or Gordon Gecko in Wall Street!!)
Posted 15 May 2007 - 12:07 AM
$30 is way too low. I'll give you $35 (lol). Realistically, with only one EP, its worth probably $75.
Posted 15 May 2007 - 12:28 AM
I may play with this some more, instead of selling it. (First $76 gets it!)
Posted 15 May 2007 - 01:36 AM
I'd be interested in it when you are ready to sell it.
Oh, btw I think this goes back to at least the 50's, although this unit might be newer.
Also, do you see any other items in 'the box' that might be the other two EPs? There were three total interchangeable EPs with the entire system.
Posted 15 May 2007 - 01:43 AM
Jess (watakushiwa) Tauber
Posted 15 May 2007 - 10:35 AM
Hey, you guys think anyone was mesmerized into a Pacific Rim trip by the writing: GO TO JAPAN ?? Kinda like a high tech fortune cookie? Keith San? Steve San?
Jess (watakushiwa) Tauber
Posted 15 May 2007 - 11:25 AM
In our 'me, myself, and I' culture, such self-effacing efforts might be considered nonsensical, but such cultural/linguistic clashes have led to many unfortunate episodes, historically.
Posted 15 May 2007 - 09:02 PM
Gaijin (like me) find this concept a little 'foreign'.
Posted 26 May 2007 - 08:10 PM
A Goto Kogaku Star Spectroscope Mini-review:
Here is a quick update on the Goto spectroscope I purchased from Steven Lynn (Littlegreenman).
Mechanical: This item is indeed a Goto 'Star Specroscope'. The large silver 1.25" portion is apparently a regular Ramsden eyepiece, with the slight modification of having the 'eye lens' (found by unscrewing the sliver part from the black) slightly thicker than one would normally find. From what I've read this cylindrical lens apparently assists in the spectrum separation. Within the black thinner portion resides the 5 amici prisms that split the spectrum into its widest separation. The prisms are cemented together to prevent reflections. The little black cap at the end where you look is the interchangeable portion. From the factory, three caps were supplied with each spectroscope, each cap optimized for specific focal ratios, although I'm not sure why or how this is done. The apparently ATMed black ring that has been placed over the GOTO JAPAN lettering has been glued in place, and seems to help with turning the device during observation. I wouldn't have done it, but it can't be removed now.
Optical: Since there is no 'slit' in a visual spectroscope of this type, whatever object you are obtaining a spectrum from needs to approximate a point source as closely as possible to prevent muddying the spectrum signature. Presumably, a person needs very steady atmosphere to get the best results. This unit was initially tested on a variety of objects in my 2.4" f15 Sears refractor including Saturn, Venus, Arcturus and the Moon. All except the Moon exhibited a beautiful thin spectrum line from violet to red across the entire field of view, with pure black above and below. Some objects showed more red and orange, some almost all blue with just a hint of the other colors. The Moon, not being a point source, merely exhibited a wash of unresolvable red and orange as expected. The literature says under good conditions this unit is powerful enough to split the double sodium line, but because seeing at the time wasn't too steady, I wasn't able to discern any absorbtion lines with certainty. Further evaluation with different apertures and focal lengths remain to be done, but I was for the most part very happy with the first round of tests.
Overall impressions: This Goto Star Spectroscope is an interesting novelty piece that provides for very satisfying and educational visual observations. It is totally unsuitable for photography. Its compact size doesn't take up any more space than a B/TMB Planetary EP. The machining and finish are top notch. I'd recommend one if you think you might be interested in this sort of observing experience.
Posted 26 May 2007 - 09:40 PM
Posted 26 May 2007 - 10:17 PM
Posted 26 May 2007 - 11:08 PM
Keith (Sorry for the tease. I'll keep everyone posted as soon as new developments come in.)
Posted 26 May 2007 - 11:15 PM
Ps, dont forget to pack up the scope also.
Posted 26 May 2007 - 11:34 PM
OK, I just figured out this little piece of information...the silver portion of this spectroscope is actually a separate piece of equipment. It is a Goto Ramsden 1.25" EP. Apparently in addition to purchasing the spectroscope, a person also had to buy an EP. I was unable to find a picture of their 1.25" EPs, but this piece matches the description of one appearing in an Astromart advertisment. The picture that was with the ad is unfortunately no longer in the Amart archives, but the description cinches it. Steven has inadvertently saved me the trouble of also hunting down a GOTO EP. Fortunate, too, considering I couldn't even locate an image of one! Whew. It seems a person took the eyepiece, screwed off the eye cup and installed the spectroscope via the 'eyepiece mounting screw cap' (see instructions I posted earlier).
But...this is is only part of the new information. Another mystery yet remains. Oy.