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I would like to upgrade my 9x50 finderscope on the Sky-Watcher Skyliner 200P. Whilst I do like the finderscope, it's a pain to use in the near vertical position, literally! I would like to go for the right angled version, but not sure about corrected image or not. Do those of you who use the corrected image version get mixed up, when going back to the main scope eyepiece? Any here use the non corrected image version and like it?
Picture the amateur astronomer. He's (yes, in this case, it's a male) sometimes still faffing about, hasn't quite got the finder thing completely sorted - he's managing, and having fun, but... well... He's got an RDF, he's got a Rigel, he's got a nice 9x50 illuminated RACI. He wishes the RACI were a bit, well, more 'mucho', as bino use has gotten him star-hopping in correct-image mode, and he feels that is probably the route he should take. He's got an Ercole mount, he's got a TS INED70, he's got a TV Panoptic 41mm to use besides his other scope(s). Soooo....add a nice Baader 2" Amici Prism Diagonal, and what do you get? An effective upgrade from the 9x50 RACI? The RACI provides 50mm aperture with 9x magnification and 5° TFOV. The combination of TS INED70, Baader 2" Amici Prism Diagonal, and 41mm Panoptic provides 70mm aperture with over 10x magnification and over 6.2° TFOV. Stick the new combination on the Ercole, opposite the main observing scope...the RACI is replaced? Is the amateur astronomer overlooking anything in these considerations, or is it a plan? There is, of course, the question of whether any but the most (prohibitively?) expensive amici prisms will deliver performance suitable for astronomy; but keeping in mind this is meant to 'merely' be a replacement for a Synta 9x50 RACI, could an offering from Baader be expected to deliver a worthwhile improvement (in combination with the other named components)? In any case, the Baader model BA2956152 is incoming, and the amateur astronomer will be more than happy to share his future experiences. To be continued.
I'm on the lookout for a RACI finderscope which doesn't have the standard holdings you get with most standard finderscopes (what I got with my SW 200P). I'm specifically after one which is held by rings as that gives me much finer control. 50mm would be ideal as anything above may just be added weight on my mount. Here is an example of something i'm looking for or even the perfect thing I am looking for: What I'm not looking for: Cheers!
I recently did a lot of research into RACIs. I wanted one with a quality prism where I wouldn't see a line. I wanted the flexibility to change eyepieces. I wanted a wide field and the ability to focus easily. I wanted rings and a synta-fit (Celestron/Skywatcher) bracket. The Stellarvue seems to fit the bill but the price is huge, especially when you include the seperate rings/bracket. Likewise, Baader do a good RACI but the price is high. I was considering building my own finder based around a GSO prism diagonal (which gets great reviews and doesn't cost a lot) and some parts from Teleskop Service but then I found the Antares Versascope 10 x 60 RACI. Having been very pleased with the quality and price of their 2" twist lock 99% diagonals, I thought I'd take a punt. I didn't even have to import, as this can be purchased in the UK from Rother Valley Optics for £99.99. This is half the price of the Baader and less than half the Stellarvue. So is it half as good? Definitely not. What you get is a quality 1.25" prism, a decent aluminium 227mm FL 60mm diameter OTA, a very long dew shield, nice neat low-profile 6 point tube rings combined with a synta bracket, and a reasonable quality, surprinsingly wide-field eyepiece with non-illuminated crosshairs. The daytime views are pin sharp with no lines or other artifacts, so the prism is definitely good. The night views are really nice. Definitely not as sharp and snap to focus as my other 'finder', the Explore scientific ED80 with 21mm Televue Ethos eyepiece, but the price is 10% of that combination - we're comparing it to an ED triplet here! The field is very wide which I found surprisingly pleasing to view. The stock eyepiece appears to give the same TFOV as my ES Maxvision 24mm 68 degree, which gives 7.2 degrees. This is something of a puzzle in as much as I can't find any details of the provided eyepiece anywhere online, nor marked on the eyepiece itself. The sales listing indicates a 25mm eyepiece which is a little confusing as it would give x9 mag rather than x 10, and neither the AFOV or TFOV are listed. From looking through it,I'd guess it's about x9. The dew shield is so long that I haven't had any issues in a few nights of use. Rotating the dew shield also focuses the scope which is very easy to do. There is lots of focus range, although I found that my ES68 24mm was just ever so slightly short of focus - a little extender ring would fix this nicely. The prism is attached to the scope via an Antares 1.25" Twist-lock, which imeans you can easily unlock and change the angle of the eyepiece to the scope. The prism has a thumbscrew to hold the eyepiece. The eyepiece, whilst a little plasticky in the casing, has decent optics and positively refused to dew up despite being left uncovered for hours. Somehow the plastic/rubber eyeguard outer assembly seems to resist dewing (note it hasn't been THAT cold recently, but that didn't stop my binocular eyepieces from dewing up on the first night). The cross hairs work fine, and I can't imagine needing illuminated ones in UK skies (I'll check this next time I'm at a proper dark site. The tube rings were very easy to align to my scope, and as they are low profile they don't tend to get banged about. This scope can be used as a little independent scope of it's own (I've used it out of my bedroom window) and it can be used for guiding. All in all I'm very pleased with the views, the ease of use as a RACI finder and the truly excellent value for money. If you're in the market for a versatile, quality RACI/guidescope, I think this is a real cracker; personally I would now find it very hard to justify paying double or more for the better known equivalents, given that I'm at a loss as to what they can do that the Versascope does not.
Last part of my spring clear out - See anything you need just drop me a line and we can sort it out for you. Payment by Paypal or pick it up in Edinburgh in person and save the p&p. Cheers gang - 9x50 Unbranded metal RACI finder with Skywatcher compatible dovetail with rings - £35 + p&p - Unbranded Red Dot Finder (moulded plastic) £5 + p&p - 1.25” Celestron star diagonal £15 + p&p - 2” TS mirror star diagonal with brass compression rings £40 + p&p Extended slow motion control for RA/DEC on EQ mount (never used) £8 + p&p
Hi all, Usual story, 8" Dob, straight-through finder, Jupiter very high, and bad back. I was going to go for a RACI, but folk seem to be recommending Telrad/Rigel. Am I missing something? If you have a Telrad or Rigel don't you still have to get behind it to see through it, which would involve the same contortions as using the straight-through finder? Or can the screens be seen from 90 degrees? I like the idea of having the illuminated bullseye of the T or R, but I really need to go for the comfort of the RACI. Can anyone advise please? Cheers, Neil.