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Old Friday 26th January 2007, 19:34   #26
PARAlaska
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So I understand that the Baader, while the consensus best zoom, won't work on the Pentax 65ED. What then is the best alternative? I can get a good deal on the Pentax XF 20 - 60, but its specs for afov and eye relief look rather lame, at least compared to the Baader. So, price independent, what zoom would you equipment experts choose? In particular, how does the Vixon 8-24 compare to the Pentax XF zoom? Is the Vixon the best non-Pentax lens? I don't wear glasses so eye relief is less of a concern to me -- I really just want to start with the best zoom available so I can keep my focus on birding rather than equipment.

Thanks for any opinions on this.
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Old Saturday 27th January 2007, 08:30   #27
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Hi there.....i used the XF zoom for a while and although image quality was ok at the low end of magnification,it degraded quite a lot when going up to 60X(that zoom delivered 20x-60x,while other zooms will grant you likely 18-51x or so)..the ER was lame ,as you said,and made very hard to enjoy using it.I then used the Swarovski astronomy style7.7-23.1 zoom,i believe this to be the foundation eyepiece for most zooms .really nice coatings ,amazingly SHARP,all the way and beyond the edges.the image at 7.7(52X)was incredible .the field of view was narrow ,maybe less than 50˚ AFOV,probably 45˚...and it didnt reach infinity at the lower magnification setting either(on the pentax 65),but,its mistique and sharpness made for the problems.Now i use the Vixen zoom. In the very beggining i missed the contrast and sharpness or the swaro,but i discovered that such contrast was at the price of a bit of a yellowish cast.The Vixen has a more neutral feeling,and is a bit brighter.I was looking at Seagulls and felt a somehow more subtil ,detailed COLOUR rendering .image seems as sharp to me now.maybe the feeling of "sharp beyond the edge "is not there,but image is good mostly all the way to the edge.it also helds power pretty well,maybe loosing at its very few mm,while the swaro kept going all the way to 7.7. FOW still being narrow BUT,maybe a few aparent degrees wider,maybe 50,52˚?at 24MM ?..I think i measured the Swaro real field at 1.8˚(dont even remember the equation),sure the vixen is more than 2˚...All in all ,a very good eyepiece...AND IT CAN BE FOUND AT 129$ NEW!!!!! someplaces!!!!!!!!!!!!!!!!!!! very good deal....hope this helps...
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Old Monday 19th February 2007, 06:57   #28
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Quote:
Originally Posted by mayoayo
all the way and beyond the edges.the image at 7.7(52X)was incredible .the field of view was narrow ,maybe less than 50? AFOV,probably 45?...but,its mistique and sharpness made for the problems.
Perhaps I'm missing something here - maybe it's the swaro mystique - but I'm curious how you manage to assess EP sharpness "beyond the edges"?

cheers
Paul
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Old Tuesday 20th February 2007, 17:35   #29
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Quote:
Originally Posted by PaulJacobson
Perhaps I'm missing something here - maybe it's the swaro mystique - but I'm curious how you manage to assess EP sharpness "beyond the edges"?

cheers
Paul
Hi ....that sentence is a way to say that image was still equally sharp at its very edge,100%...It seems to me that the FOV of the eyepiece was the limit of its sharpness,a field of view given by the compromise of the zooming design..in other words ,it seemed like the glass itself was sharp beyond the edges of the field stop..Does this makes sense?
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Old Monday 26th February 2007, 01:31   #30
Mark Ansell
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Baader zoom purchase

Hi there, I'm about to purchase a Zeiss Diascope. am I to believe then that the Baader zoom you reviewed is the way to go in place of the Zeiss zoom.

Thx
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Old Friday 9th March 2007, 22:10   #31
Crake Dude
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Baader Hyperion 8-24mm Zoom availabily in UK

The following site has one of these left in stock as I write....it's probably the only one available in UK at present, as other stockists are awaiting back orders, I believe.

http://www.modernastronomy.com/

Steve
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Old Thursday 7th June 2007, 10:48   #32
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Nikon zoom on Pentax scopes

Just remembered that the Nikon zoom can be used on the Pentax 100mm model, with or without the astro-adapter (have a look on cr-telescopes at http://pt-ducks.naturlink.pt/). However, as it seems that the focus range of the 65mm is different of 100 mm model, the best would be to test it first. Nikon zoom has better image quality than the XF and maximum magnification will result in 56x.
Did any one tested the Baader zoom on the 100mm model? if yes, does it focus at the infinity?

David
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Old Monday 2nd July 2007, 15:27   #33
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Does anybody know if the baader zoom works in the PF80 or PF100? thanks?
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Old Tuesday 3rd July 2007, 16:35   #34
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If anyone wants to send me their Baader zoom, I volunteer to test it in my Pentax 100.
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Old Tuesday 3rd July 2007, 16:48   #35
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Quote:
Originally Posted by mmdnje View Post
Does anybody know if the baader zoom works in the PF80 or PF100? thanks?
Sadly, the Baader Zoom will not reach focus in the PF80. However,
the other (fixed focus) Baader eyepieces do!

Kind regards,
young Ian.
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Old Thursday 30th October 2008, 08:41   #36
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It also doesn't reach focus on the PF100...
David
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Old Thursday 30th October 2008, 14:17   #37
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There is some slight difference in fov of the Vixen and the BH zooms.
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Old Monday 19th January 2009, 19:17   #38
OwenM
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Has anyone here tried the new version of the Hyperion zoom, and if so, does it suffer the same problems with focus on Pentax scopes as its predecessor?
Perhaps the inaccurate click stops have been addressed?
I don't see anything describing improvements over the previous version...
http://www.optcorp.com/product.aspx?pid=30-718-78-9246
Have to scroll 3/4 way down on this page:
http://www.alpineastro.com/Eyepieces...ccessories.htm
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Old Monday 19th January 2009, 23:50   #39
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Owen,

The importer says that the click stops are now accurately labeled and the new eyepieces are supplied with both 2" and 1.25" barrels. The optics and the housing are supposed to be unchanged so I wouldn't expect it to reach focus in the Pentax scopes.

Henry
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Old Tuesday 20th January 2009, 17:03   #40
OwenM
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Thank you, Henry.
That's unfortunate. It seems like a very nice eyepiece, and for a very nice price.
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Old Saturday 6th June 2009, 02:35   #41
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I am resurrecting this thread for further discussion. I recently purchased a Promaster Infinity Elite 65 mm ED scope. The scope comes with a "Plano Zoom" eyepiece which has an uncanny resemblance to the Baader Hyperion Zoom mentioned in this thread. In fact the entire scope resembles a Baader 65 mm scope that was sold two or three years ago.

After reading through this thread I yanked the Plano Zoom off of the Promaster and put it into the Pentax 65 EDA body. It is dark outside right now so I cannot check the scope at extreme distances. I can zoom in on a houselight approximately 200 yards away from my home. With the zoom set at the lowest setting I can just achieve perfect focus on the porch light. Cranking up the zoom to its heighest setting gives me some room to focus beyond the 200 yard porchlight but under current conditions I cannot tell how far.

Does this sound similar or dissimilar to the Baader Hyperions previously listed performance in this area?

I have to readily admit that most of my birding is done under 200 yards....even with the scope. If I were to be looking at objects farther than that then I would be wanting more magnification than the 15-20x that this zoom starts out at....in which case I should be fine with the zoom's ability to focus beyond that 200 yard distance at the higher settings.

I will follow through with more experimentation tomorrow morning.

Any thoughts/comments would be welcome.
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Old Saturday 6th June 2009, 03:44   #42
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Frank..same thing happened to me with the Swarovski Astro zoom on the Pentax PF65ED..I wasnt able to focus infinity at the lowest power..only a little zoom in ,and I was the reaching infinity without problem..It never bothered me..The Vixen zoom is more forgiving in that respect,as you know,But If it works this way,maybe you found yourself an excellent zoom for the Pentax!!..
I'd say,use what you have,and adapt..We are going to need a lot of that philosophy in the next one or two decades!!!....
One more thing...How is the fit of the Zoom on the Pentax..is there room for any alteration or custom fitting that would improve close focus range?...
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Old Saturday 6th June 2009, 13:38   #43
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Frank,

I examined a photo of the Promaster scope from a 24hourcampfire.com review dated 10/23/08. While the eyepieces appear to be very similar there also seem to be some differences. For instance the knurled locking ring at the front looks wider on the Baader zoom to me and the zoom adjusting ring on the Baader appears narrower and placed closer to the back of the eyepiece. It seems possible that both eyepieces come from the same source and I suppose the optics might be the same, but it would be odd for the mechanical parts to be slightly different if they are the same eyepiece. Probably the only way to know for certain is to examine them together.

The Baader scope may never have actually been available. The photo I linked to is the only place I've ever seen it.

Henry
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Old Saturday 6th June 2009, 18:37   #44
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One thing that seems strange about this zoom being a Hyperion,is that it would be THE only Hyperion that reaches focus in a pentax Scope..Multiple users tried the Hyperion on their Pentax scopes,and they dont seem to reach focus..Frank's eyepiece doesnt reach infinity at the lower powers,but does ok at higher magnifications..That is not way Hyperion Zooms worked in the Pentax PF80/65 ,if I remember well...
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Old Sunday 7th June 2009, 02:21   #45
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Quote:
One more thing...How is the fit of the Zoom on the Pentax..is there room for any alteration or custom fitting that would improve close focus range?...
No, not that I can tell. The Plano zoom does not have a 1.25 inch collar to remove and it does sit flush up against the locking collar. I don't think even removing the plastic lock-down collar in the Pentax body would do anything.

Henry, Mayoayo,

I played with the zoom on the Pentax further today. Same findings in daytime as last night. I was able to focus on objects out to 500 yards....just barely at the lowest magnification setting of the zoom. At any of the higher settings I have a very small fraction of a turn left on the focus knob to focus past those objects.

Henry,

Yes, the rubber magnification adjustment ring on the zoom, as well as the metal parts in between the rubber rings is of a different size to that of the Hyperion. That is what I was referring to in my earlier post.

Optically it does offer the same wide field of view that the Hyperion lists. I have a Celestron 8-24 zoom that I have been using on the Pentax periodically and compared it directly to the Plano zoom. The Plano is noticeably wider at all settings. However, there definitely is a different color representation to each zoom. The Plano looks just a bit warm while the Celestron looks decidely more neutral or "blue-green" in representation.

Edge distortion at the low setting of the Plano is evident. It reminds me of the comments on the Zeiss zoom at low settings though I have never personally looked through a Zeiss to be able to compare even by memory. Once you hit 25x the edge distortion is reduced dramatically. At the highest setting it does not seem to be evident.

All I can think of for now.
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