![]() I’m selling this for an ugly duckling price, but it will serve you well as long as you understand the limitations, and advantages, of a large, fast, achromatic doublet. Seekers of pristine optics should seek greener fields! Anyway I would rather the buyer be pleasantly surprised than disappointed. It looks much worse than it is (I owned a Televue Genesis with a similar defect and Al Nagler told me that I would never notice the difference). It still showed a fair amount of CA around brighter targets and was also very challenging to mount adequately. I actually managed to capture this in one of the images. The scope pictured below is a 150mm F/12 achromat with a well figured objective lens. If you look at the doublet in a certain light you can see inconsistencies in the anti-reflective coating. Optics are overall good with no obvious scratching. The focuser rotates in the fashion of most of these focusers, that is, somewhat roughly, but it works. It works fine but it’s no Feathertouch! I’m sure a replacement focuser could be purchased but this one does the job, focuses and locks down, though the lock is just a normal allen head bolt. ![]() It was a two-speed but the planetary bearings never worked right so I converted it to a single speed. Dew shield extends and retracts smoothly and locks down securely, the heavy manhole-cover lid screws on smoothly. The scope looks decent with some scuffing to the white tube here and there and wear to the aluminum rings. The original owner added some vinyl letters on the scope and notably listed the aperture as 150 even though the scope was sold as a 152. But on most objects it’s not something you will notice, and it actually tends to accentuate a few things like the color contrast of Albireo, for example. ![]() It’s a fast achromatic doublet so on brighter stars and planets you’ll see quite a bit of purple chromatic aberration. Will do quite nicely on many deep sky objects, too: galaxies and larger planetary nebulae, emission nebulae, etc. It would be a great outreach scope mounted on a sturdy enough mount, perfect for wide field views of open clusters or just for cruising Milky Way star fields. It’s homely, but puts up nice, high contrast views. Up for sale is an Astro Telescopes 152mm f5.9 (900mm) wide-field refractor.
0 Comments
Leave a Reply. |