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Which Explorer Scientific 82?

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#1 kfrank2380

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Posted 12 September 2019 - 07:56 AM

Hello Everyone,

 

My scope is a Skywatcher 8" Dobsonian. I pulled the trigger on the 8.8 eyepiece. I'm thinking about getting a second one as well. I'm looking at the 4.7 but concerned it might be too much magnification and only be good on perfect seeing nights. The 6.7 is too close to the 8.8 to me. Another option is the made 5.5 ultra wide which seems to have good reviews. Any advice?

 

I already have other lower power plossl eyepieces a 32mm, 25mm, 12.5mm and 10mm


Edited by kfrank2380, 12 September 2019 - 08:25 AM.

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#2 Mike G.

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Posted 12 September 2019 - 08:00 AM

depends on your skies.  my ES 4.7 only comes out to play once or twice a year.  the 6.7 several times, the 8.8 regularly.


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#3 Jeff Struve

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Posted 12 September 2019 - 08:22 AM

Depends on the scope/s it will be used in too


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#4 airbleeder

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Posted 12 September 2019 - 08:23 AM

 I don't use my ES 4.7mm 82* in my 8" f6 dob or 4" f6.5 achro every night I observe, but I use it often enough. 


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#5 kfrank2380

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Posted 12 September 2019 - 08:25 AM

Depends on the scope/s it will be used in too

I just edited the original to include that. It's a 8" Dob.


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#6 sg6

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Posted 12 September 2019 - 08:29 AM

6.7 to 8.8 sound s close but that is a 30% change and so a 30% change in magnification - consider 100x to 130x, to me not a small change in magnification.

 

I am one of the classics that for planets my eyepieces go up in 1mm increments from 3.2mm to 12mm.

 

I would say get the 6.7mm you will use it, and the difference is not sort of just 2mm but 30%.


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#7 tomykay12

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Posted 12 September 2019 - 01:03 PM

The one I use most, every session the scope (10" dob) is out, is the ES 30mm. I know you have a 32mm plossl; so do I, and it never gets used anymore.


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#8 aeajr

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Posted 12 September 2019 - 04:22 PM

Hello Everyone,

 

My scope is a Skywatcher 8" Dobsonian. I pulled the trigger on the 8.8 eyepiece. I'm thinking about getting a second one as well. I'm looking at the 4.7 but concerned it might be too much magnification and only be good on perfect seeing nights. The 6.7 is too close to the 8.8 to me. Another option is the made 5.5 ultra wide which seems to have good reviews. Any advice?

 

I already have other lower power plossl eyepieces a 32mm, 25mm, 12.5mm and 10mm

Welcome to Cloudy Nights!

 

You have picked a great line of eyepieces to build upon.  The 6.7 would be my recommendation.

 

 

Until recently I had an Orion XT8i.  Sold it about a month ago.  Orion and Skywatcher are both built by Syntha, so the scopes are extremely similar.

 

Here is the eyepiece set I built for the XT8i over time.

Orion XT8i – 8”/203 mm manual Dob Newtonian, 1200 mm FL F5.9

 

These were used almost every session   2XB = 2X Barlow Lens

 

  • 38 mm/70   31.5 and 2.2 degrees FOV   2”
  • Meade 82 20 mm/82   60X  and 1.37 degrees   2”
  • Baader Hyperion 8-24  zoom   50X to 150X (My most used 1.25” eyepiece in this scope)
  • Baader Hyperion 8-24+2XB     100X to 300X (Used almost every night)

 

 

 

I built this single FL eyepiece set in parallel with the zoom for those occasions where I wanted or felt the need for a wider FOV than the zoom provides, but the zoom was always my primary 1.25" eyepiece in the XT8i.      

 

ES        8.8 mm/82 136X and  .6 degrees    I usually used the zoom but this would get a lot of use if I didn't have the zoom. 

 

ES        6.7 mm/82 179X and  .45 degrees  This was often the highest magnification I could handle. This was often where I would move from the zoom to the 82 degree eyepiece.  I could go to this almost every night.  It got lots of use. 

     
Meade 5.5 mm/82 218X and  .37 degrees    Frequent used but not every night.  Often conditions were not good enough.  A better step than going to the 4.5 or 4.7 mm eyepiece.

 

Meade HD60 4.5    267X     Rarely used.  Typically I could not go this high.  Maybe a few times a year. I eventually sold it as it just gathered dust. The ES 4.7 would be comparable with a little wider FOV. 

     
ES        8.8+2XB  (4.4 mm equivalent) 272X and  .3 degrees  I have it if I want it, but super rare I could use it.

ES        6.7+2XB   (3.8 equivalent) 358X and  .22 degrees Never able to go this high except on the Moon and only under excellent conditions. 

 

Meade 5.5+2XB (2.5 mm equivalent) 436X and  .18 degrees I think I tried it once. 


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#9 csa/montana

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Posted 12 September 2019 - 04:30 PM

Moved to Eyepieces, for better fit of topic.


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#10 Spikey131

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Posted 12 September 2019 - 06:13 PM

Consider a 2x Barlow.  It will double the magnification in each of your Plössls and extend their eye relief.

 

Spend your eyepiece money on focal lengths you use the most.  That is, consider upgrading to 82 degree EPs in the FL that you find yourself using every night.


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#11 vdog

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Posted 12 September 2019 - 06:25 PM

I personally don't find the 6.7 to be too close to the 8.8.  I use them pretty differently.  Nevertheless, I don't think you can go wrong with the Meade 5.5.


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#12 Miranda2525

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Posted 12 September 2019 - 09:49 PM

Hello Everyone,

 

My scope is a Skywatcher 8" Dobsonian. I pulled the trigger on the 8.8 eyepiece. I'm thinking about getting a second one as well. I'm looking at the 4.7 but concerned it might be too much magnification and only be good on perfect seeing nights. The 6.7 is too close to the 8.8 to me. Another option is the made 5.5 ultra wide which seems to have good reviews. Any advice?

 

I already have other lower power plossl eyepieces a 32mm, 25mm, 12.5mm and 10mm

The 4.7mm at 255x is not too much magnification for certain things like Saturn or some globular clusters, and close double stars. The 6.7mm at 179x is not too close to the 8.8mm at 136x. The 5.5mm UWA is also a great eyepiece, (218x). You would use the 5.5mm a bit more than the 4.7mm. The 5.5mm has better eye relief also.


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#13 clearwaterdave

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Posted 13 September 2019 - 12:16 AM

For me I like the 14/82.,good for scanning and for viewing.,cheers



#14 Ernest_SPB

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Posted 13 September 2019 - 01:33 AM

My scope is a Skywatcher 8" Dobsonian. I pulled the trigger on the 8.8 eyepiece. I'm thinking about getting a second one as well. I'm looking at the 4.7 but concerned it might be too much magnification and only be good on perfect seeing nights. The 6.7 is too close to the 8.8 to me. Another option is the made 5.5 ultra wide which seems to have good reviews. Any advice?

 

I already have other lower power plossl eyepieces a 32mm, 25mm, 12.5mm and 10mm

Consider at first 2" 18 mm ES82 - it'll show you much more then its short focal siblings


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#15 aeajr

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Posted 13 September 2019 - 09:49 AM

BTW, you can also consider the Meade Ultra Wide eyepieces which are also 82 degree.  I have both and find them very comparable in terms of the image.  The Mead tend to be a little bigger/heavier and lower in cost. 

 

Meade 82 vs. ES 82

https://www.cloudyni...e-82-eyepieces/




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