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ofranzen

Eyepieces for mak/newt?

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Is there anything particular one should keep in mind when looking at eyepieces for mak/newts? I have the SW 190MN astrograph and the eyepieces I got when I bought it are all but rubbish.

I am looking at a bunch of different models ranging from about 5-25 mm and perhaps 60-85 degrees fov. So nothing too extreme.

More expensive EPs talk about "well corrected" but that is less of an issue with the mak/mewt, right?

Regards

/Ola

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The 190MN is F/5.3 so you do still need reasonably well corrected eyepieces to avoid seeing astigmatism in the outer parts of the field of view. Astigmatism comes from eyepiece optics. Coma (which comes from from the scope optics) is quite a bit less in a mak-newt than a conventional newtonian.

Decent eyepieces range from £50 (eg: BST Starguiders) to, well many £hundreds for the really exotic ones.

Baader Morpheus are well thought of quality eyepieces with a 76 degree apparent field and a good range of focal lengths. There are many choices really, depending on the budget available.

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Thanks for a quick reply. I'm leaning a bit towards the Hyperion zoom with its barlow. I really don't know what FL will be most useful to me yet so the zoom, or the Hyperion modular with the tuning rings could perhaps be a good start. The zoom is particularly of interest as it will come in handy basically forever when showing the telescope to family and friend as for some reason the first question is always "where is the zoom" :)

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Posted (edited)
2 hours ago, ofranzen said:

Thanks for a quick reply. I'm leaning a bit towards the Hyperion zoom with its barlow. I really don't know what FL will be most useful to me yet so the zoom, or the Hyperion modular with the tuning rings could perhaps be a good start. The zoom is particularly of interest as it will come in handy basically forever when showing the telescope to family and friend as for some reason the first question is always "where is the zoom" :)

I think you have made a wise choice in going for the Baader zoom. It is not as heavy as it looks. I tried one a few weeks ago. Once you have found the sweet spot, then you can purchase an eyepiece of a fixed focal length to what you need. Also a plus for having a zoom for public out reach, (when we can get out and about again after curfews/lockdowns have been lifted), and if you have a lot of other astro accessories and want to travel light.

Edited by Philip R
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I agree with Phillip - the Baader zoom would be a good workhorse and earn its keep !

 

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Posted (edited)

+1 for the Baader Zoom, it's very good. And if funds allow you to also buy a Baader Hyperion 2.25x Barlow lens (often come up used, here or on UKABS for c £50), this will transform your 8-24mm zoom to a c 3.55-10.66mm high power zoom for moon, planets and tight doubles.

The 24mm setting is rather narrow, at 40 degrees, so you might want to add in a single wide angle low power  eyepiece of say 22-30mm.. if you could stretch to a used Vixen LVW 22mm (65 degrees), or Televue Panoptic 24mm (68 degrees), you might never need anything else😊.

Dave

Edited by F15Rules
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Thanks for your input. The Zoom and its 2,25x barlow sells for £235 as a bundle so chances are big I'm ordering that soon.

Clear skies.

/Ola

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Personally, I struggled with the Baader zoom. The eye relief is very short and so I passed it on.  I enjoy much easier views with my Lunt zoom on a variety of targets. It was used predominantly with my 130 pds and an Altair Astro 102 triplet. For me, the ES 82’ range are unbeatable at their price point.

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15 minutes ago, Owmuchonomy said:

Personally, I struggled with the Baader zoom. The eye relief is very short and so I passed it on.  I enjoy much easier views with my Lunt zoom on a variety of targets. It was used predominantly with my 130 pds and an Altair Astro 102 triplet. For me, the ES 82’ range are unbeatable at their price point.

Another vote for the Baader zoom + Barlow.  

One of the many plusses for me is that it takes a Dioptrx to correct my astigmatism.

From what I've heard the Lunt is not as sharp as the Baader on fast scopes, but I can't speak from personal opinion.  However, extra eye relief sounds interesting and would be an advantage if you observe with glasses or a Dioptrx.

A couple of questions about the Lunt zoom: firstly, does a Dioptrx fit it? Secondly, does the eye lens rotate when zooming?

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I really like my Celestron Regal and Olivon spotting scope eyepieces.  Once the eye cup is screwed off, there is plenty of eye relief for eyeglasses and the top does not rotate during zooming.  They vary from about 44 degrees at 24mm to 63 degrees at 8mm AFOV.  The field stop is sharpest toward the central part of the zoom range and gets a bit fuzzy at either end.  Edge correction is pretty decent.  It's included in my eyepiece field of view images at 8mm, 12mm, and 24mm.  The only tricky part is finding them since they are not sold individually anymore.  I watched ebay and the classifieds to pick up mine from spotting scope owners who didn't want them but wanted to recoup some of their investment.

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Many thanks, Louis!

Do these zooms take a Dioptrx? I see there's a photographic thread, is it between 41 and 44mm?  If it's the same as the M43 on my Baader zoom a Dioptrx will fit, although an O ring or elastic band on the thread will help.

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57 minutes ago, Second Time Around said:

Many thanks, Louis!

Do these zooms take a Dioptrx? I see there's a photographic thread, is it between 41 and 44mm?  If it's the same as the M43 on my Baader zoom a Dioptrx will fit, although an O ring or elastic band on the thread will help.

These posts on the Cloudynights forum cover that. It looks like it is possible, with some care:

https://www.cloudynights.com/topic/573621-new-baader-mark-iv-8-24mm-zoom-eyepiece/?p=8816705

There are some photos from Don Pensack (Starman1) further down that thread.

 

 

 

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14 minutes ago, John said:

These posts on the Cloudynights forum cover that. It looks like it is possible, with some care:

https://www.cloudynights.com/topic/573621-new-baader-mark-iv-8-24mm-zoom-eyepiece/?p=8816705

There are some photos from Don Pensack (Starman1) further down that thread.

 

 

 

Thanks, John, but I obviously didn't explain myself well.  It was the Celestron and Olivons that Louis was referring to that I'm talking about.

I can confirm that a Dioptrx fits my Baader zoom, preferably with an O ring.

 

 

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7 minutes ago, Second Time Around said:

Thanks, John, but I obviously didn't explain myself well.  It was the Celestron and Olivons that Louis was referring to that I'm talking about.

I can confirm that a Dioptrx fits my Baader zoom, preferably with an O ring.

 

 

Actually I didn't read your post carefully enough - you did say that of course :rolleyes2:

I think this is one of the eyepieces that Louis was referring to by the way:

https://www.ebay.co.uk/itm/Celestron-1-25-Regal-M2-8-24mm-eyepiece-with-case-Boxed-Fully-multi-coated/162688568329?hash=item25e0fe8c09:g:juIAAOSwzHNZy2gr

I've not used one myself by Louis is always positive about them.

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3 hours ago, Second Time Around said:

Many thanks, Louis!

Do these zooms take a Dioptrx? I see there's a photographic thread, is it between 41 and 44mm?  If it's the same as the M43 on my Baader zoom a Dioptrx will fit, although an O ring or elastic band on the thread will help.

You'll like it.  What's also really nice about them is the silky smooth zoom action.  There's no stiffness in it like so many other zooms.

Once the eye cup is completely removed by unscrewing it counterclockwise after the eyecup is all the way down (it retracts when rotating counterclockwise), a 37mm thread is revealed that is 6mm high with 2mm unthreaded above that.  I was able to thread a 37mm step ring onto it perfectly.  Thus, if you can locate a 43mm to 37mm step down ring, you should be able to attach a Dioptrx to it.

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I've found several step down rings of the right size but all will reduce the eye relief, that's already been reduced by the Dioptrx.

The eyepiece hasn't arrived yet, but if I decide to keep it I'll have an adaptor made that's simply a narrow ring with a 37mm inside diameter and a 43mm outside diameter.

However, that will probably have to wait until after the pandemic is over.

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