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Revalation 20x80 v Helios Quantum 20x80
Posted 28 April 2012 - 07:29 PM
Posted 28 April 2012 - 08:06 PM
I have moved you post into the Binocular board so that it will be seen by people already using binos...
Some cameras, some lenses, some scopes and some mounts... and I used to think I had some idea...
While some turn sheds into observatories - I have turned my Observatory into a shed....
Posted 29 April 2012 - 12:29 AM
Sky-Watcher 200P FlexTube Synscan GoTo.
TAL 2x Barlow
Revalation 2x Barlow
Phillips SPC900NC LX Modded
Xbox 360 Cam
Celestron C70 Mini Mak
Turn Left At Orion Book
Wire wool for cleaning bird cr@p from the optics.
A motorcycle for fun in the light nights
Posted 29 April 2012 - 07:22 PM
Posted 29 April 2012 - 07:39 PM
If you pay £250 for an 80mm pair the FOV will show much less distortion.. If you get a FJ paid for £1000+ then you will get perfect star spots accross the whole FOV..
Mark..the galaxy hunter!
Meade 16 inch
25 x 100 bins
Thornbury nr Bristol eye limit mag 5.5
Galaxies count 1,070 as at 11/09/2015
Posted 30 April 2012 - 08:06 AM
However, it is true. A half-way decent eyepiece retails in the region of £40-50, a coated 80mm short-focus achromatic lens about £80, prisms retail around a tenner each. A binocular consists of 2 eyepieces, 2 objective lens groups, 4 prisms, two focusing mechanisms, and associated housing/tubing. Now, ask yourself what quality it is reasonable to expect for a 20x80 binocular that retails for less than £85.
You get what you pay for will not be much help.
It will show you more than you can see with the unaided eye, it will show you more than you can see with a 10x50 or cheap 15x70, but you will not have crisply focused stars, you will have ghosting and flaring, you will have obtrusive aberrations except for the middle 50% of the field of view, and you will need to learn to conditionally align it -- regularly -- because even in the unlikely event that you receive it collimated, the odds are that that it will repeatedly lose collimation because of the way the prisms are mounted.
If you are prepared to live with that, then fine, lots of people choose to do so and profess to be happy with their choice. It is remarkable that a binocular of this size can be made so "affordable", but please don't kid yourself that the quality will be anything to write home about: this binocular is made to a price, not a quality spec, and quality control, by the manufacturer's own admission, is at best minimal (it is, quite simply, cheaper to replace the occasional customer reject than it is to employ QC staff).
Also, please don't assume that all binoculars that look alike are alike. They may differ in (amongst other things) the quality of coatings, the type of eyepiece, the glass used, the way the prisms are mounted and the level of quality control.
Lots of info/advice on Choosing and Using Astro Binoculars
(including 2nd Ed of my book Binocular Astronomy)
Posted 01 May 2012 - 11:47 AM
I find that they are fine for DSO's and binocular doubles. Most of my Messier List has been spotted through these and I still get them out regularly and enjoy the widefield views through them.
As I havn't tried the Helios I cannot comment on them however you generally get what you pay for so If you have the readies available I would go for the higher quality Helios, if funds are short however I have found the Revelations deliver the WOW factor at a very reasonable price and are a good starting point.
You will need to tripod mount both pairs so factor in the cost of a tripod as well and remember that you will need a tall one. Both have a built in Tripod mounting bracket which saves you a £10!
Happy star gazing!
Helios 10x50WA Naturesport + Camlink TRPRO32B Tripod, Helios Quantum4 25x100 Binoculars + Parrallelogram Mount
Orion Optics VX10 F4.8 + Europa 8" F6 + Tal 125R + Tal 100RS + AZ-EQ6 GT Mount + BGO 5, 6, 7, 9. 12.5, 18mm + Baader Hyperion 8-24mm Clickstop Zoom Mk-III + 2.25x Barlow + TV Delos 10mm & 17.3mm + TV Panoptic 27mm + TV 2" 2x Powermate + Baader Hyperion Aspheric 31mm
Messier objects seen: 108/110 Planets seen: 8 Member of Guildford Astronomical Society
Posted 01 May 2012 - 03:13 PM
I did note more deficiencies as time went by, in particular lack of stable focus, flaring of bright objects, and chromatic aberrations, especially on the moon. Therefore, when I could get a secondhand pair of Helios Apollo HDs I jumped on that. The difference is considerable. With these I can spot the phase of Venus at the moment (the old ones couldn't ever) and it shows the flattened shape of Saturn. Chromatic errors are much smaller, and the image is brighter overall. Focus (using individual focusing) is rock solid.
So, do I regret buying the Omegon? Absolutely not! They gave me a lot of viewing pleasure for a very modest price. Do I think the Helios is better: Absolutely! But the price is a lot higher.
BTW, I would go for 15x70 rather than 20x80, because the former can still be hand held (just), or simply be used in a reclining chair, or rest your arms on e.g. the roof of a parked car. This reduces set-up time, and means you start observing more quickly. At 20x you must have a tripod.
Edited by michael.h.f.wilkinson, 01 May 2012 - 03:14 PM.
Scopes, Eps and other stuff
Observation summary: Messier: 110/110, Caldwell: 97/109, RASC Finest NGCs: 93/110, Herschel: 316/400, Brightest Planetaries: 60/100, Planets: Mercury to Neptune (inclusive), Minor planets: 2, Lunar: 55/100, Comets: 14, Supernovas: 9, Novas: 1, Quasars: 3
Posted 07 May 2012 - 09:45 AM
If you want Binos for getting to know whats where in the sky, I would recommend lower magnification and wider field of view (as Michael's recommendation). I have a pair of Helios 11x80mm bins which I can just about hand hold for limited periods of time and regularly use on a photographic tripod. As I'm getting on a bit the exit pupil is a bit large and therefore I waste a bit of light, otherwise I'm very pleased with them particularly for brighter DSOs. Hope helpful and welcome to SGL from Suffolk
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