Their optics are multi-coated to render bright images and their barrels are threaded to accept optional Orion filters. The two interchangeable Sirius Plossl eyepieces of 25mm and 10mm focal length deliver low 16x and high 40x magnifying power, respectively. Another nice feature is that the drawtube collar sports male T2 threads, which allows attachment of a DSLR or mirrorless camera directly to the drawtube via a T-ring (sold separately) for prime focus photography. The ShortTube 80-T 80mm Refractor Telescope comes equipped with a 1.25" cast-aluminum rack-and-pinion focuser, which has a dovetail finder scope shoe molded into the housing. The oversized aluminum dew shield guards against moisture accumulation on the lens and blocks off-axis light for better image contrast. Its short 400mm focal length (f/5.0) means you'll enjoy a generous field of view as you take in the scene in high definition. Housed in the ShortTube 80-T's 15" aluminum optical tube is an 80mm (3.1") achromatic objective lens that is multi-coated for outstanding light transmission.
Just pop it on your favorite field tripod or telescope mount and it's ready for grab-and-go-anywhere action. I'll post some pics of the adapter when I get it.Our popular ShortTube 80-T compact refractor is back! This wide-field wonder is outfitted with a correct-image 45-degree diagonal and a correct-image 6x26 finder scope to provide a correctly oriented image for daytime Terrestrial (hence the "T" in 80-T) observing. Below are some pics showing the gap, shim and light leak on the R&P. Īll things concidered not a hard choice, so I have spoken to my brother and for once they are not overly busy, and he is making the adapter for me. This makes more sense as I have the Crayford sitting there doing nothing anyway, and my brother is the manager at a engineering workshop. Or b) make an adapter for the Crayford that was upgraded on my RC with a Moonlite. replace the focusser - I have two options here a) purchase a focusser that will fit as a straight swap, the cost of which is almost as much as the scope itself, which doesn't make much sense to me. purchase a better quality guidescope - a good option as I could get a scope that would double as a wide field imaging scope, but financially not viable at the moment.ģ. continue as is - this would just niggle at me until I did something about it.Ģ. Due to poor fitting componants it also has a huge light leak.Īs I see it, the options I have are quite clear,ġ. The focusser does have "some" shimming in an attempt to remove some of the unreasonable slop present, but as one would expect in a cheap scope, you get what you pay for.
When focus is achieved and lock screw set, the barrel is pushed a conciderable distance, which I believe is causing image tilt, showing up as a little comet rather than a point of light. I am not sure if this effects guiding or not, so I haven't tried to find or fix the issue (if it is even an issue).Īnyway since my imaging camera is down, I thought I'd have a bit of a look, and have come to the conclusion that the stock R&P focusser may well be the problem, as it has a lot of slop. I have owned an Orion ST80 for quite some time now, it is a good and cheap little scope for guiding with, however I noticed a long time ago, the images I am getting in my guide software, have a huge amount of what appears to coma.
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