Search found 17 matches

by Umar Ahmad
Thu Feb 02, 2017 12:25 am
Forum: Absolute beginners
Topic: Magnification
Replies: 58
Views: 28532

Re: Magnification

Dear David and Brian, I decided to go ahead with buying an 8mm Vixen LVW and 10mm SLV. I had also looked at the Tele Vue Panoptic and Pentax XW ranges, though these were out of my budget. After you pointed out that a slow scope like mine would be more forgiving with eyepiece quality, I decided to re...
by Umar Ahmad
Wed Jan 25, 2017 3:28 pm
Forum: Absolute beginners
Topic: Magnification
Replies: 58
Views: 28532

Re: Magnification

Dear David,

Thank you for your reply.

I think I will keep my 6mm Vixen for Mars then.

I've also asked on Stargazer's Lounge and the general consensus is that the Vixen LVW and SLV ranges are still a good option, with 8, 10 and around 14mm being a good choice of focal lengths.

Regards,

Umar
by Umar Ahmad
Sun Jan 22, 2017 10:09 pm
Forum: Absolute beginners
Topic: Magnification
Replies: 58
Views: 28532

Re: Magnification

Dear Users, Hello again after a long time! I last posted on this topic in February 2012, however, a change in circumstances since then has led me to reopen this. As a quick summary, I had a 300mm (12 inch) GOTO dobsonian (Focal length: 1,500mm, Focal ratio: f/4.9) and wanted some advice as to why ex...
by Umar Ahmad
Thu Jan 12, 2017 5:40 pm
Forum: Telescopes and instruments
Topic: CPC 800 XLT or the Meade LX90 ACF?
Replies: 4
Views: 3532

Re: CPC 800 XLT or the Meade LX90 ACF?

Dear Brian,

Thank you for your reply.

I took your advice and asked for more information on Stargazer's lounge. The general consensus was that whilst both scopes are very good, the Celestron has the edge due to it's better thought out design and GOTO.

Thanks again,

Umar
by Umar Ahmad
Tue Jan 10, 2017 8:49 pm
Forum: Telescopes and instruments
Topic: CPC 800 XLT or the Meade LX90 ACF?
Replies: 4
Views: 3532

CPC 800 XLT or the Meade LX90 ACF?

Dear users, I was wondering if any one on this forum has had any experience with the Celestron CPC 800 XLT , the Meade LX90 ACF or something similar? I understand they are both fork mounted SCTs with practically identical specifications and both systems feature largely automated GOTO GPS alignment s...
by Umar Ahmad
Sat Feb 18, 2012 4:36 pm
Forum: Absolute beginners
Topic: Magnification
Replies: 58
Views: 28532

Sorry for the delay in writing. At Astrofest, I decided to buy the 6mm NLV for £119. The LVW range was on display, and will probably be my next purchace. I have not been able to test it out yet, there has not been a single clear night since Astrofest. Hopefuly I will get as much use out of it at Mar...
by Umar Ahmad
Fri Feb 10, 2012 8:22 pm
Forum: Absolute beginners
Topic: Magnification
Replies: 58
Views: 28532

David, Looks like the 6mm Vixen NLV is a great start then, I hope to get a good price tommorow - I believe the Opticron stand is selling the complete Vixen range.

I will be sure to give an update tommorow - your advice was completely invaluable, I can now buy confident and informed!

Regards, Umar
by Umar Ahmad
Thu Feb 09, 2012 6:20 pm
Forum: Absolute beginners
Topic: Magnification
Replies: 58
Views: 28532

If I start with the NLV 6mm, (eventually acquiring LVW 8&5 mm) will the restricted FOV be too tight for all planetery nebulae and globular clusters?
by Umar Ahmad
Thu Feb 09, 2012 4:44 pm
Forum: Absolute beginners
Topic: Magnification
Replies: 58
Views: 28532

I will take that into account next time I come across a review. Vixen manufacture two barlows - however, I read somewhere that barlows increase eye relief, but if used with eyepieces that already have long eye relief, vignetting occurs. Have you come across this? Do barlows preserve the FOV? So the ...
by Umar Ahmad
Wed Feb 08, 2012 5:11 pm
Forum: Absolute beginners
Topic: Magnification
Replies: 58
Views: 28532

After coming across this Sky at Night Group Test (high power eyepieces), the Vixen 8mm LVW is beginning to look very tempting:

http://www.vixenoptics.com/acc/lvw_eyepieces.html

The link is with the 8mm eyepiece.

65 FOV, 20mm eyerelief, around £199

Umar
by Umar Ahmad
Mon Feb 06, 2012 8:46 pm
Forum: Absolute beginners
Topic: Magnification
Replies: 58
Views: 28532

Is splitting close doubles the only viable use of very high magnifications? I looked at Tele Vue's Nagler range, and coupled with a dioptrix they are well above my budget. It is still interesting that it is possible to correct astigmatism in that way.  Is Tele Vue the only manufacturer of the Nagler...
by Umar Ahmad
Sun Feb 05, 2012 5:19 pm
Forum: Absolute beginners
Topic: Magnification
Replies: 58
Views: 28532

Thanks again David. Vixen also do LVW eyepieces - 55 FOV and 20 mm eye relief but not in 6mm, so maybe if I decide I need higher magnification, this is the best option? Half way between an NLV's field of view and a Nagler's, but much cheaper! My skyliner dob is motorised and Astronomy now praised th...
by Umar Ahmad
Sat Feb 04, 2012 8:19 pm
Forum: Absolute beginners
Topic: Magnification
Replies: 58
Views: 28532

Thanks David, advice much appreciated. I will probably be making my first investment in better quality eyepieces than the Plossils supplied with my scope at Astrofest next weekend. Anyone attending? The Williams Optics sound great but at £69 too good to be true? There must be a compromise somewhere....
by Umar Ahmad
Sat Feb 04, 2012 2:22 pm
Forum: Absolute beginners
Topic: Magnification
Replies: 58
Views: 28532

It looks like I need to sacrifice a little contrast and detail due to my less than perfect eyes. Does  250x (6mm) seem like a good compromise? If the seeing is awful, then I have a 25mm super plossl (recommended as the first thing to be replaced by Astronomy Now when they reviewed my scope) and a 3x...
by Umar Ahmad
Fri Feb 03, 2012 6:42 pm
Forum: Absolute beginners
Topic: Magnification
Replies: 58
Views: 28532

Some details: Telescope: Skywatcher Skyliner 300p flextube (305mm GOTO dobsonian) Focal length: 1,500mm Focal ratio: f/4.9 I am not quite sure what the numbers mean on my eye subscription, but I have them if they help! I think the astigmatism is in both eyes, and bad enough to make it necessery to w...