Jump to content

Welcome to Stargazers Lounge
Register now to gain access to all of our features. Once registered and logged in, you will be able to create topics, post replies to existing threads, give reputation to your fellow members, get your own private messenger, post status updates, manage your profile and so much more. If you already have an account, login here - otherwise create an account for free today!
Photo

Comparison 15 x 70mm 20 x 80mm

- - - - -

  • Please log in to reply
6 replies to this topic

#1
mdstuart

mdstuart

    Brown Dwarf

  • Advanced Members
  • 2,684 posts
Good evening

After enjoying my Celestron 15 by 70mm for many months I now have some Revelation 20 by 80mm to compare with.

The 80mm are much larger and heavier. You might think an extra 10mm will not make much difference..well let me tell you the 15 by 70mm feel like toys compared to the 20 by 80mm...

Certainly the 15 by 70mm are the largest you could hold by hand for any length of time as has been said on many of the reviews..

The coating on the 80mm which is green seems much better than the purple 70mm coatign as it reflects much less light when held up in a room.

I expected a much smaller FOV..It is smaller but the view is about four moon widths so it still feels reasonable when compared to low power on the 10 inch dob!

I did have a fiddle with the collimation to get it spot on. This was pretty easy using the hidden screws after reading a collimation explanation on cloudy nights.

Great so far..:D

More to follow after the next clear night!

Mark

Mark..the galaxy hunter!
Darkstar 350mm
25 x 100 bins
Thornbury nr Bristol eye limit mag 5.5
Galaxies count 816


#2
lunator

lunator

    Global Moderator

  • Global Mods
  • 7,888 posts
Mark

look forward to hearing about the comparison :D

Cheers

Ian

#3
kidlands

kidlands

    Star Forming

  • Advanced Members
  • 438 posts
  • Location: Berkshire
Thanks Mark

I was thinking of upgrading to 20x80's and that has helped, looking foreward to your report.

steve
Meade 10" Lightbridge, Celestron 15x70 bins, Horizon 8115 tripod, Panaview 32mm, Baader Hyperion 17mm, WO SPL 6mm, Hotech laser collimator.

#4
southernman

southernman

    Star Forming

  • Advanced Members
  • 474 posts
  • Location: Christchurch New Zealand
I have a set of 20 x 80 (konus) that I have been using for some time. Compared to my other binoculars (9x 63 Meade and 10x50 nikon ) they are much harder to use hand held. The views though when mounted securely are simply staggering. Good luck with your observing
254mm F/4.7 Skywatcher Dobsonian
150mm F/8 Skywatcher Achro Eq 5 mount Synscan Goto upgrade
120mm F/5 Skywatcher Achro Eq mount 80mm F/11.4 Achro Az-3 mount
Various other small refractors and reflectors
Konus 20x80 10x42 monocular

#5
mdstuart

mdstuart

    Brown Dwarf

  • Advanced Members
  • 2,684 posts
Update...

Full moon but I thought I would give the two sets of binos a work out.

The extra 5x magnification does make a noticable difference so Jupiters moons are further apart, the moon is noticably bigger, Star cluster look more resoved etc. M57 for example is much more noticable as a non stellar object. Double stars are a little further apart. Albeiro looks fab in both sets of binos! It allows more detail to be picked out but its not a huge step up.

The 80mm along with the higher mag pulls in more light. I would say about 0.5 magnitude tonight. To be fair the moon was washing everything out tonight but M31 was fine in both binos but M32 was more prominent in the 80mm.

Both sets produce stars as nice points (as long as your eyes are central to the eyepieces). Both show coma in the last 25% or so of the FOV but not too much to make an issue.

The double cluster is awaesome in the 80mm with its extra mag and light drawing power...:D

So the 80mm win, they are a step up but not a huge difference...

On a dark night I think I will be able to pick out those slightly fainter galaxies such as NGC 7331, 2903 278 etc...

So who wants my 15 by 70's ....£35 delivered??

Or swap for a manfrotto 222 joystick tripod head!

Regards

Mark

Mark..the galaxy hunter!
Darkstar 350mm
25 x 100 bins
Thornbury nr Bristol eye limit mag 5.5
Galaxies count 816


#6
matt c

matt c

    Star Forming

  • Advanced Members
  • 440 posts
  • Location: Bolton, Lancashire
Hmmm maybe 20 + 80 bins with a good tripod are a better upgrade from 10 + 50s instead of 15 + 70s

;)
15*70 skymaster bins
Possible refractor in future
5 ish LM skies

#7
Mark at Beaufort

Mark at Beaufort

    Global Moderator

  • Global Mods
  • 3,506 posts
  • Location: Hereford
Interesting review Mark - I knew you were going to enjoy these larger binos.

My main problem is that you got me thinking - perhaps I should upgrade my Celestron 15x70!!

See you soon.

Mark

Mark

 

Messier list - 110/110 (complete) - Caldwell list - 62/67 - limit in UK - O'Meara's Hidden Treasurers - 84/87 - limit in UK
Herschel 400 - 394/400 - www.deepskywatch.com - 407/598(UK)  (Quasars - 1)   (Supernovae - 7)  (Nova - 1)  (Lunar 100 - 85/100) Double stars - Sissy Haas book by constellation - (Brightest Planetary Nebulae 28/41  - new venture Oct/2013)  (Comets since 2007 - 10)  (Venus Transit - 2 (UK + USA) -  (Mercury Transit - 1 (UK)  (Total Solar Eclipse - 1 (Turkey) - Annular Solar Eclipse - 2 (Spain + USA)

 

Observing/equipment secretary - Herefordshire Astronomical Society - website link - https://sites.google.com/site/hsastro/home





0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users