Small refractor+Ethos eyepiece OK combo?

[pluton]

Hello,

 I have a ZS 70ED and I like know if the Ethos eyepiece combination with this scope are good , if this have focus with the small focal lenght of the 70ED(420mm) and if the image overall is  brillinat, sharp and contrast , as the Ethos  have huge AFOV..

Worht the Ethos or may be a 82 degree AFOV less pricely have a good feeling also?

Thank you very much

Paco

[Stu]

I do use Ethos eps in my TV76 and the results are excellent. I have them for a variety of scopes. Would I buy one specifically for a small scope? Not sure but if you do you won't be disappointed I'm sure.

One thing I do find with a 21 ethos in the 76 is that there is a fair amount of field curvature so the stars at the centre and edge do not focus at the same point. I bought a TS flattener and when positioned correctly it sorts it out. I think this is a normal problem with short focal length doublet refractors but it's only an issue with very widefield, long focal length eps.

Stu

[NGC 1502]

Hi Paco, I'm sure the combo of Ethos and your 70ED would give wonderful views.  

Some would be bothered by using very large eyepieces with a small telescope, could look a bit odd, others won't be the least worried by that.

You could also get great views from other TeleVue eyepieces, the Panoptics, Delos or Naglers won't disappoint, they have an excellent reputation because they are all very nice indeed.

All the best in your choice, Ed.

[hunterknox]

You might have an issue with balance, depending on the kind of mount you use. On an equatorial mount you should be fine.

[boyfromlincs]

i use panoptic and delos in my refractor on an az4 tripod and  after getting it set up properly its been fine.. my heaviest ep is 1.6 lb..

[John]

I've seen a 13mm Ethos used with a PST solar telescope which has an aperture of just 40mm so it would work just fine with a 70mm. I use a 31mm Nagler (2.1 lbs) and a 21mm Ethos (2.2lbs) with my 4" F/6.5 refractor on the AZ-4 mount and the views are stunning under dark skies 

[swamp thing]

You might have an issue with balance, depending on the kind of mount you use. On an equatorial mount you should be fine.

Can't see what difference having an EQ mount would make. It's more down to rigidity not type. A wobbly flimsy EQ mount and he'll have problems. A huge alt-az mount he won't.

[osbourne one-nil]

I've got a TV85 and use a 6mm Delos, 35mm Panoptic and a 9MM ES wide angle thingy....they're wonderful!

[hunterknox]

Can't see what difference having an EQ mount would make. It's more down to rigidity not type. A wobbly flimsy EQ mount and he'll have problems. A huge alt-az mount he won't.

...except if it's a single-arm/side mount type alt-az like a Giro or a Minitower, in which case the combination of an ultra-short, light scope and heavy eyepiece might move the balance point to somewhere not on the line of the dovetail,which in practical terms means that his scope will always be trying to rotate. I had a Megrez 72 with an Ethos eyepiece on a Giro mini - trust me on this one, An L-bracket might be the answer.

[John]

Giro-type mounts seem much more sensitive to weight changes / balance than single arm-alt az mounts such as the AZ-4 and the Vixen Porta.  

[m.tweedy]

have used my ethos eyepieces in my WO66. without issue.

The 21 just looked obscene. need a sturdy diagonal though and the focus tension tight or it slides when looking high.

[Brian Nordstrom]

Hi Paco .

I use TV Naglers and Panoptics in my Takahashi SKY90 to awesome results the views are so good I forget that I am only using 90mm of perfect Fluorite APO scope .

My mate has a full set of Ethos's (????) and the vierw are as good as the naglers , better on some objects around the southern milkyway but I am happy with what I have and as said balance can become an issue with small scopes and HUGE! eyepieces but they really perform well together .

Brian.

[melsky]

My ethos eyepieces work a treat in my Takahashi FSQ85, pin sharp edge to edge even with the 21mm.

Mel

[pluton]

Hello,

Can be similar the views of the Ethos+small refractor  for low magnifications compared to views for binocular medium size , for example 15X70 , 20X80...os so?

Thanks again

[Pig]

I cant wait to use mine, the suspense is killing me  I wish the mount would hurry up and get here.

[michael.h.f.wilkinson]

My Nagler 31T5 "Panzerfaust" gives excellent views in my APM 80mm F/6 (15.5x at 5.3 deg true FOV), so I do not see why an Ethos 21mm should not be brilliant in a 70mm F/6 (20x at 5 deg FOV). Should be awesome on objects like the Veil and the North America Nebula

[pluton]

In a small refractor like the 70ED , what kind of focal lenght is more interesting :small or large ?

A 8 or 6mm or a 13, 21mm.. ?

Moreover, is similar the image compared with a giant binio?  Ahuge 100º AFOV  mono-ocular or 65º AFOV bino-ocular ? Similar in feeling?

All the best.

[NGC 1502]

In a small refractor like the 70ED , what kind of focal lenght is more interesting :small or large ?

A 8 or 6mm or a 13, 21mm.. ?

Moreover, is similar the image compared with a giant binio?  Ahuge 100º AFOV  mono-ocular or 65º AFOV bino-ocular ? Similar in feeling?

All the best.

Regarding focal length, depends what you are looking at as to what's best.

But for me, a scope like a short focus refractor does something no other scope can do - very low power and wide field, so if I had just one eyepiece it would be just that.

With my 70mm Pronto, I use a 27mm Panoptic, gives 18x and a 3.8 degree field, so that would be my single eyepiece choice.  A 21mm Ethos would be brilliant.......

Yes, it is like a bit like binocular viewing - low power / wide field - but with the option of shifting to a higher power, something that most binoculars don't do.

Don't forget that if using a diagonal, the image is left / right reversed.

Regards, Ed.