Search found 54 matches

by Barry B
Wed Oct 16, 2013 10:19 am
Forum: Absolute beginners
Topic: Weight of Telescopes
Replies: 4
Views: 1879

Re: Weight of Telescopes

Hi I am a few years older than you and not blessed with great strength, I have a 100mm f13 refractor on an alt azimuth Gibralter mount. Whilst the tube weight is not particually high, the main problem with a longish refractor is that for comfortable viewing they need to be mounted at least 5' from t...
by Barry B
Wed Oct 09, 2013 12:39 pm
Forum: Telescopes and instruments
Topic: Long Focal length refractors
Replies: 2
Views: 1811

Re: Long Focal length refractors

Hi I have been using a 4"F12 Skylight refractor with the superb Carton object glass for the past 6 months. I have nothing but praise for the performance, craftsmanship and service from Skylight Instruments, their current range now uses F15 lenses specially made for them by Teleview. The only drawbac...
by Barry B
Mon Mar 11, 2013 5:02 pm
Forum: Telescopes and instruments
Topic: New Telescope / dirty eypieces
Replies: 11
Views: 4075

Re: New Telescope / dirty eypieces

Hi all Thanks for your help and comments, I shall obtain some Baader cleaning fluid and go to work on my eyepieces. I concur with Lady Isabella's remarks regarding Richard Day's skill and artistry in producing these 'scopes. I too have visited his home and workshop and I am very impressed, his lates...
by Barry B
Sat Mar 09, 2013 5:51 pm
Forum: Telescopes and instruments
Topic: New Telescope / dirty eypieces
Replies: 11
Views: 4075

Re: New Telescope / dirty eypieces

Hi, The eyepieces I have used as follows:- 8mm & 22mm Vixen Lanthanum W/A's 13mm Nagler 35mm Panoptic The worst affected are the Vixens, but they are also the most used. I am wondering if the speckling of the coating is caused by grease or abrading by my eyelashes and eyebrows, which are quite bushy...
by Barry B
Sat Mar 09, 2013 1:35 pm
Forum: Telescopes and instruments
Topic: New Telescope / dirty eypieces
Replies: 11
Views: 4075

New Telescope / dirty eypieces

Hi All, I've recently purchased a Skylight 100mm f13 refractor, I have not yet had any clear nights to do any observing, but whilst alighning the finder on a distant daylight object I was aware of the FOV being full of small blurred spots. My first thought was that the scope had a fawlty object glas...
by Barry B
Sat Dec 15, 2012 1:26 pm
Forum: General chat
Topic: Sir Patrick Moore
Replies: 53
Views: 13862

Re: Sir Patrick Moore

In the early 1950's I went to my first scout camp at Broadstone Warren near Forest Row in Sussex. On arrival one of the first things we noticed was the headlines in the local newspaper regarding 'Flying Saucers seen over Forest Row'. That night we all shivered in our tents, convinced that before mor...
by Barry B
Mon Feb 13, 2012 1:07 pm
Forum: Absolute beginners
Topic: Magnification
Replies: 58
Views: 30032

Sorry for my delay in replying. I find the 8mm Wide Angle Vixen more user friendly than the 13mm Nagler + 2x Barlow due to its greater eye relief, even though I don't wear glasses. Unless I almost press my eye against the Nagler I am not really aware of the extra field of view (80 vs 65 from memory)...
by Barry B
Mon Feb 13, 2012 12:59 pm
Forum: Absolute beginners
Topic: Magnification
Replies: 58
Views: 30032

Sorry for my delay in replying. I find the 8mm Wide Angle Vixen more user friendly than the 13mm Nagler + 2x Barlow due to its greater eye relief, even though I don't wear glasses. Unless I almost press my eye against the Nagler I am not really aware of the extra field of view (80 vs 65 from memory)...
by Barry B
Tue Feb 07, 2012 9:46 pm
Forum: Absolute beginners
Topic: Magnification
Replies: 58
Views: 30032

Magnification

I use a 10" f6.3 unguided Dobsonian. For planetary observation I have the choice of a 13mm Nagler, a 2x Teleview Barlow and a 8mm Vixen wide angle lanthanum. For Jupiter and Saturn I generally find that the best and most comfortable view is obtained with the un-Barlowed Vixen with it's 20mm eye reli...
by Barry B
Thu Dec 08, 2011 1:16 pm
Forum: Imaging techniques
Topic: complete newbie to imaging
Replies: 19
Views: 7108

Dear David, Thanks again for your input, The Clave' flats are advertised by Beacon Hill, or at least were, I haven't checked their site recently. Like yourself a 50mm lens would be my first choice, I used to have an old metal breechlock f1.8 on a CanonF1 and it was a superb lens, I think it was a re...
by Barry B
Wed Dec 07, 2011 7:46 pm
Forum: Imaging techniques
Topic: complete newbie to imaging
Replies: 19
Views: 7108

Dear All Thank you for your advice, much appreciated. The primary mirror of my telescope has a Zygo analysis showing Strehl value as 0.99 and PV. wavefront as 0.094. I have no indication as to the flatness of the secondary but I suspect that it is the same for all of Orion UK Newtonians. If I do hav...
by Barry B
Tue Dec 06, 2011 7:13 pm
Forum: Imaging techniques
Topic: complete newbie to imaging
Replies: 19
Views: 7108

David, Many thanks for comments. I had not thought about Japan's current difficulties, but I think you have a point. You are right about the three cameras I listed being due for replacement, but I think that the probable updates will be of less interest to me than the current lower (relatively) pric...
by Barry B
Tue Dec 06, 2011 1:04 pm
Forum: Imaging techniques
Topic: complete newbie to imaging
Replies: 19
Views: 7108

complete newbie to imaging

Hi, I am a complete novice to Imaging and am about to buy my first digital camera. I have more or less narrowed my choice to either Canon or Nikon and possibly Sony. The two cameras I am most interested in are the Canon EOS 5D Mk11 and Nikon D700 and a possible distant third the Sony A900. I have al...
by Barry B
Sat Dec 03, 2011 5:08 pm
Forum: Telescopes and instruments
Topic: Equatorial Platform
Replies: 3
Views: 2875

Equatorial Platform

Hi I am thinking of buying an Equatorial Platform to use with my Orion UK 10" Dobsonian mounted Newtonian, and would appreciate any advice / comments on these devices. The one I am considering is made in the UK and costs around £450, can handle up to 14" aperture with combined tube/mount weight of 1...
by Barry B
Mon Nov 21, 2011 4:05 pm
Forum: Telescopes and instruments
Topic: collimation help
Replies: 8
Views: 2539

I had a similar problem with my Orion Optics 10" f6.3 Newtonian which I cured as follows:- Remove the secondary mirror and stick a length of masking tape down the inside of the tube opposite the eyepiece. Carefully measure and mark a line from the top of the tube downwards exactly opposite the centr...