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Equipment Discussions >> Binoviewers

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Earl
member


Reged: 03/05/07

Loc: NW NJ
High Mag EP Pair
      #6623849 - 07/08/14 05:22 PM

Hi,

Just wondering what you good people find is a good planetary, Moon and bright object mag limit for an 85mm refractor with binoviewer.

I have a pair of ES20 EP but these only get 90x or so. I had Saturn and the Moon @ 90x the other night and seemed like I could use some more mag. Light falloff wasn't terrible on Saturn. The Moon was more than bright enough @ 90x.

So, what is a realistic upper limit?


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k5apl
scholastic sledgehammer
*****

Reged: 05/19/06

Loc: Arkansas
Re: High Mag EP Pair new [Re: Earl]
      #6623953 - 07/08/14 06:31 PM

With my 80mm refractor, I find the upper limit on an average
seeing night is 150X. On a good seeing night, 210X. Sometimes I see more detail with 120X when seeing is poor.
Wes


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George Blahun Jr
super member


Reged: 08/28/07

Loc: Republic of Quaker Hill, CT
Re: High Mag EP Pair new [Re: Earl]
      #6623970 - 07/08/14 06:42 PM

16mm Brandons give me nice high contrast images. Are you using a Barlow or corrector? What is the native focal length of your scope?

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Earl
member


Reged: 03/05/07

Loc: NW NJ
Re: High Mag EP Pair new [Re: George Blahun Jr]
      #6624006 - 07/08/14 07:06 PM

OCS with Binotron 27. 600mm TV85

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Earl
member


Reged: 03/05/07

Loc: NW NJ
Re: High Mag EP Pair new [Re: k5apl]
      #6624010 - 07/08/14 07:08 PM

210X - WOW! Are you saying for the Moon only or is Saturn still bright enough with 80mm aperture?

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George Blahun Jr
super member


Reged: 08/28/07

Loc: Republic of Quaker Hill, CT
Re: High Mag EP Pair new [Re: Earl]
      #6624034 - 07/08/14 07:29 PM



I would be surprised if you were able to consistently get much more than 125X with 150X as a max.

Edited by George Blahun Jr (07/08/14 07:35 PM)


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Earl
member


Reged: 03/05/07

Loc: NW NJ
Re: High Mag EP Pair new [Re: George Blahun Jr]
      #6624107 - 07/08/14 08:14 PM

Thanks for the in-sights everyone. I think I'll be looking for a pair of 14mm EP soon. Calculates out to 130x maximum with 56x and 99x available via the other power switch settings.

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beatlejuice
Pooh-Bah
*****

Reged: 04/05/11

Loc: Hamilton, ON,Canada
Re: High Mag EP Pair new [Re: Earl]
      #6624249 - 07/08/14 09:44 PM

You might also consider the 12mm Meade HD60's which would max you out at x150 when seeing allows which is not unreasonable with the TV85. They also have good eye relief for binoviewing.
By now you have probably noticed that with the powerswitch once you have your first pair of eyepieces each subsequent pair only really gives you one more useful magnification range that you don't already have with the first pair.

Eric


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k5apl
scholastic sledgehammer
*****

Reged: 05/19/06

Loc: Arkansas
Re: High Mag EP Pair new [Re: Earl]
      #6624266 - 07/08/14 09:54 PM

Hi Earl
My using 210X is only when transparency is good and seeing is very good/excellent. Saturn looks good and 3-4 moons can
be seen. My eyepiece is an excellent TAK Hi-Ortho of 2.8mm
focal length. But, it performs well on the Moon and also
double stars too. Trouble is, we don't get those kind of
nights very often. So most planetary/Moon/double star viewing is 120X to 150X.
Wes


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Earl
member


Reged: 03/05/07

Loc: NW NJ
Re: High Mag EP Pair new [Re: beatlejuice]
      #6624335 - 07/08/14 10:35 PM

Quote:

By now you have probably noticed that with the powerswitch once you have your first pair of eyepieces each subsequent pair only really gives you one more useful magnification range that you don't already have with the first pair




Yes, the power switch makes the choice more difficult. Overlapping focal length oculars comes with the (power switch) territory. I also have a 140mm refractor that I am planning on using with the bino. The 140 has a good set of 5 EP's for mono vision. I use the TV85 out on my deck for quick looks and I want go to 2 eyes only with it. I really would like a happy medium for both scopes with (2) pairs of EP.

I guess my main concern overall is running out of light. To state the obvious, with apertures of 85mm and 140mm, light fall-off has to be considered and I don't want to make the wrong choices in this regard.


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Mark9473
Postmaster
*****

Reged: 07/21/05

Loc: 51N 4E
Re: High Mag EP Pair new [Re: Earl]
      #6624612 - 07/09/14 03:01 AM

Quote:

I think I'll be looking for a pair of 14mm EP soon. Calculates out to 130x maximum with 56x and 99x available via the other power switch settings.



That is an excellent choice IMO.


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REC
Post Laureate
*****

Reged: 10/20/10

Loc: NC
Re: High Mag EP Pair new [Re: Mark9473]
      #6624768 - 07/09/14 08:24 AM

Earl, what scope is the 85mm and the focal length?

I have a 80ED f/600 and usually the highest I can go with it is 125x on a good night (5mmEP). Most the time it's 100x

Remember, your cutting the light in half with the BV. The ES20mm are good EP, I have a pair. One idea is to get a barlow that you can remove the tube and screw in the glass element into the nosepiec or into the diagonal. That will get you down to the 15mm area.

The pair of 12mm Meade is also a good idea.


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Earl
member


Reged: 03/05/07

Loc: NW NJ
Re: High Mag EP Pair new [Re: REC]
      #6625079 - 07/09/14 11:50 AM

Quote:

Earl, what scope is the 85mm and the focal length?

I have a 80ED f/600 and usually the highest I can go with it is 125x on a good night (5mmEP). Most the time it's 100x

Remember, your cutting the light in half with the BV. The ES20mm are good EP, I have a pair. One idea is to get a barlow that you can remove the tube and screw in the glass element into the nosepiec or into the diagonal. That will get you down to the 15mm area.

The pair of 12mm Meade is also a good idea.




Sorry, scope info is now in my signature.

I have a couple of single eyepieces. A 16mm and a 13mm. Next clear night I am going to mono view thru the binoviewer and see what the light fall off is like while viewing Saturn. I hope this will give me a better perspective on the right high power bino EP.


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DaveJ
Carpal Tunnel
*****

Reged: 01/07/05

Loc: NE Ohio
Re: High Mag EP Pair new [Re: Earl]
      #6625095 - 07/09/14 12:01 PM

Quote:

Sorry, scope info is now in my signature.

I have a couple of single eyepieces. A 16mm and a 13mm. Next clear night I am going to mono view thru the binoviewer and see what the light fall off is like while viewing Saturn. I hope this will give me a better perspective on the right high power bino EP.




I see that you have a TEC 140 in your signature. I regularly use 300x or higher in my TEC 140 with Baader MarkV binoviewers. I'm in NE Ohio and our seeing is usually between bad and awful. Nonetheless, over 300x is quite useful on Jupiter and Saturn. I normally drop the magnification on the Moon but for the life of me I can't explain why.


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