![]() ![]() Max moved into the retirement home after I returned to the US,Īt the house of my bushwalking friend Chris, This scope would give me a scope in Sydney and had sentimental value attached to Max. I return to Sydney for a month of R&R, bushwalking in the Blue Mts with my friends, I grew up in Australia, and now live in the US. If there was no other interest from the family in the scope, When the family started the planning to move Max into a retirement home, The telescope had been originally owned by Max, The abberations inherent in the J-B design by Vladimir Sacek Refers to Jones' article in Sky and Telescope, Sept 1957, p548. The construction page includes references to Jones,Īnd to Bird who worked on the chromatic abberations This scope represents a substantial investment in timeĪnd would not have been undertaken without some confidence in the Jones Bird design. In fig 16.24, the abberations of the Plossl eyepieceĪnd the Jones-Bird objective when combined in a telescope, partially cancell.Īt the Astronomical Society of Eastern Missouri The axial color correction of the the third system, the Jones-Bird, appears to be good,īut the system exhibits both astigmatism and field curvature. Must be corrected simultaneously with a simple doublet. The reason for this is that three abberations (spherical, coma and color) Reveal that it is difficult to achieve a good performance with these systems. "The ray tracing results, presented in fig 13.9, Section 13.4: Focal Correctors Jones, Bird and Brixner. There is a cap for the front of the scope, (The plate has no optical function it's just the support for the secondary.) The secondary is mounted on an uncoated glass plate, rather than a spider, There is a small negative focal length corrector lens just before the secondary, The primary is spherical 125mm with a measured f/3.3 The optical design is Jones Bird, giving a short newtonian style telescope. The equatorial head has backlash, but probably no worse than expected in this price range.) I haven't dismantled the equatorial head, so I can't say anything authoritative about it. (I later changed my mind about the tripod see tripod Top of the line, equatorial mount and tripod. This particular scope came with what at first sight appeared to be a solidly built, Presumably it was pitched to amateur observers expecting good optics. (on the internet, I've seen US$1690 as the original MSRP, with all accessories and eyepieces). Limited the observer to bright compact objects.Īll scopes back in those days were expensive, This coupled with the relatively small scope aperture, 125mm, The small aperture eyepieces restricted the scope to relatively high magnifications. Which (I've been told) were standard inside Japan at the time,īut are only found on department store scopes in the US. The scope came with a 0.965" focuser and eyepieces, So that I would know how much effort to put into it. My first job was to figure out the best performance I was likely to get from this scope, The role of telescope reviewers in magazines 21. Tripod has pointed feet, is not house trained or safe for observing 19.4. Tripod wing nut rotates and is too small 19.2. Simplified drift polar alignment without cross-hair eyepiece 19. Vinyl plastic shower caps considered harmful to optics 16. Alignment/Collimation of Secondary Mirror 15. Alignment/Collimation of Corrector Aperture 14.2. Corrector lens assembly and inside locking ring 14. Ungluing and Regluing secondary mirror 13.7. Secondary Stalk: Longitudinal Adjustment 13.6. Secondary Stalk: gratuitously complicated 13.5. Secondary disassembled, nomenclature 13.2. Disassembly of Secondary Mount: Tools 12.1. Conversion from 0.965" to 1.25" eyepieces 9. Laser Collimator, Cheshire and Autocollimator 8. Focuser Draw Tube is chromed (instead of black) 6. Mounting Ring Knobs are Imperial 1/4-20 5. OTA, Mounting Rings, rotationally locking the OTA 4.1. Cleaning the Front Plate, the Secondary and the Corrector Lens 3. It comes with an adjustable aluminum tripod, a set of three eyepieces, moon filter and a RedDot Starpointer finder scope to easily locate heavenly bodies.Table of Contents 1. ![]() It can also be used for astrophotography with an appropriate T-Mount adapter. The telescope offers multi-coated glass optics to allow clear and crisp images. It is suitable for both terrestrial and celestial applications. The Tasco SpaceStation Refractor AZ telescope is a good choice for beginners.
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