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Showing results for tags 'williams optics'.
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Hi, I bought some Williams Optics Binoviewers. They appear very nice quality but I cannot achieve foucus with them on a 5" Celestron Newtonian, FL = 650MM fr = f5. I have not used binoviwers before today and I bought them primarily for my new telescope which hasn't arrived yet, a Celestron 9.25 CST. I wanted to try the binoviwers out on the 5" today but could not achieve focus. I also tried using the 1.5 x Barlow that came with them. Is there a reason they won't focus? Do you think they will be OK on my bigger scope? Thanks.
The clearout continues! Williams Optics 2" diagonal with carbon fibre side plates. These retail for £135, but I only want £55 of your pounds. For that I'll send this insured post. I don't have the original box, but it will be well packaged. It will include the 2"-to-1.25" adapter. There's a couple of small wear marks on the tube from use, otherwise it's in tip-top condition.
I'm having problems with my new crayford focuser I fitted to my modified Tasco 17TR. The scope is an early 90's 80mm refractor with a focal length of 900mm. The problem isn't apparent when viewing planets, etc, it's when I try to use my camera (Nikon D80) or web cam (SPC880 modified). With the original focuser, the focal range (focuser movement) was from 840mm (measured from the lens) through to 1040mm. With the new crayford and adaptor the focal range is from 910mm through to 990mm. SInce fitting the focuser, I get beautiful, clear views of Saturn and the rings, Mars, basically everything I've turned it towards but, I can't get the focal range for photography. The focal point is shorter than what I can obtain as it is. Last night, I removed the 1.25" adaptor and held the web cam head inside of the 2" eyepiece holder and could obtain focus (albeit wobbly) so I'm thinking I need to cut my tube down. Any advice?? Before you ask why I'd bother, this telescope has a previous mod done in 97, the fitting of a Vixen ED series lens and the quality is stunning, now if I can get my focal point correct for photography I'll be very happy. I can't modify the adaptor (a cost of $150 to get it machined and that's with me providing the stock and design) but I'm not overly keen on trimming the tube down. I can't see any other options though. If I cut the tube down and it's short for visual purposes I can run a 2" or 1.25" focal extender tube (80mm length seem common and readily available). Thanks! Tasco 17TR with Vixen ED lens, Williams Optics Crayford focuser, home made tube rings mounted on Skywatcher EQ3 Pro GOTO mount
For sale is a little used 2 inch Williams optics 2 inch diagonal. Excellent condition of the mirror, slight corrosion noted on the small screws and some barrel rubs and minor scratches other wise excellent condition. Does not come with the 1.25 / 2 inch adaptor, this has been mislaid, hence the price - you can buy these from fleabay for a tenner. £50 ono including postage and packing. Paypal and bank transfer welcome. Thanks for looking Neil.
I do not have a 'dual rig' in the usual meaning of the word. I have a 'dual-purpose' set up. My main telescope is an Esprit 120. On top of that I have bolted my Williams Optics Star 71 Mk I. I have not aligned these. Sometimes my main target will be something in the Esprit and other times the WO 71. When I shoot through the Esprit, occasionally there is a reasonable framing through the WO 71. I have been trying to gather Ha of a portion of the Horsehead nebula through my Esprit 120. Whilst this was running, I captured Ha through my WO 71. It is not completely straightforward. First off, because I use an OAG the Esprit focusing runs can wreck the guiding and lead to lost subs via the WO 71. Secondly the Esprit might want to do a meridian flip mid-way through a WO 71 20 minute exposure. And finally, when it does flip the framing in the WO 71 changes significantly - so much so that I have to crop out around 20% of the stacked frame. Nevertheless, I am getting pretty much 'free' (or, if you prefer, 'bonus') data from the WO 71, since this was not my main target. Imaging has been a challenge this last month. Indeed, despite going out every night that the weather allowed, I only managed 5 hours and 40 minutes of Ha between 2 January and 4 February. (I got 8 hours of Ha through the Esprit - that can be found here.) So, this is: Williams Optics Star 71 Chroma 3nm Ha - 17 x 20 minute subs Moravian G2-8300 Heavily cropped At this rate, I should get the colour done some time in April.
Stacked and processed image of AR12529 taken using William Optics FLT-110 refractor, 1.25" Lunt Herschel Wedge, Baader 7nm H-alpha filter, Celestron X-Cel LX 2 x barlow and QHY5L-II Monochrome planetary camera. 1000 frame AVI processed through PIPP to select the best 50%, then through RegiStax6 to stack and add wavelets.