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Just wondering what peoples thoughts are on the pro's and con's of the different types of mounts out there? Do Dobsonian mounts have issues on non-flat surfaces (like a garden) or can Equatorial mounts ever have issues getting out of line too easily?
Hi I have an opportunity to acquire for visual imaging, a 2nd hand (manufactured 2000) Russian TAL1 reflector telescope for about £60. Is this a reasonable price,?
Being new to astronomy & not currently owning a telescope I've no idea whether TAL is a quality product, so I'd welcome your thoughts.
Note: This scope is in the USA, so international shipping may prohibit a sale. However, without the heavy Scopeguard case the shipping cost will be substantially reduced.
I can provide a full frame image taken with this scope if anyone is interested.
Reduced to £3155 for the complete package. I will consider offers, but this is already close to my bottom price.
I’ve decided to sell my Takahashi Epsilon Ɛ-180. The scope and optics are in good cosmetic and optical shape. There are a few minor tool marks around the collimation screws but otherwise no issues. The primary mirror is centered with a Catseye Hotspot.
The scope will come with the Takahashi corrector, rings and top plate ($457 add-on), front cover, Scopeguard case ($500 add-on), BT Technologies dovetail bar ($150 add-on) (has a blemish but is super solid), Astrozap dew shield and cap with focus mask ($175 ad-on), Precise Parts Tak corrector to M48 adapter ($110 add-on), the Takahashi collimation tools, an M68x1 male to M54x0.75 female and a M54x0.75 male to 2" compression ring adapter ($100? add-on) (these allow you to use the scope visually with 2" eyepieces.)
I replaced the stock focuser (included) with an Optec TCF-Leo focuser with temp probe. With the included scope adapter and Tak corrector adapter this is a $1400 add-on.
Total new cost = £5900
All of this for £3155 plus shipping.
Very happy with it! Wish the sky were clear, but as we all know, when we buy astro equipment, it's cloudy! Argh!
The telescope was collected from David Lukehurst at noon and then we travelled back to Cambridge.
John Nichol primary mirror: 37mm thickness, Suprax. Hilux coated. Optics 1/8 PV wavefront 1/27 wave RMS. Strehl .95. Secondary mirror: 62mm MA.
Here a few photos:
I am thinking on grinding my own lightweight mirror (first f4 16", later f4 24"). The lightest and cheapest option is to get a thin blank and slump it in a decent kiln.
Anyone has longer term experiene with slumped mirrors? Overall doesn't seem to be more work than a normal (not pregenerated) blank.
Do I have to grind the backside as in case of normal flat back mirrors to avoid astigmatism? How do people support a convex back while grinding? Does it make sense to grind a hole in the middle for additional support? I am remotely considering a convertible Newtonian/Cassegrain system anyway...