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  #21  
Old 17-02-2020, 01:11 PM
ausastronomer (John Bambury)
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Hi Jeremy,

I don't own the 17mm Nikon NAV HW. My comment which you have quoted was "The 17mm Nikon is the best eyepiece I have used".

Around this focal length, I personally either own or have exclusive use of as part of my 3RF Australia Equipment, 18mm UO HD Orthoscopic, 17mm ETHOS, 17mm Nagler T4, 14mm Pentax XW and a 13mm ETHOS.

These are all very good eyepieces. None of them are as good as the 17mm Nikon NAV HW. I gave you the reasons already. "Contrast, sharpness and throughput like a Zeiss ortho combined with a wide FOV and excellent eye relief. It gets no better in the eyepiece world." While the others are all excellent eyepieces they are all a fraction behind the Nikon. It has everything one could hope for in an eyepiece all rolled into 1 eyepiece.

If I was starting out from scratch in the modern eyepiece world I would be buying the 17mm (also 14mm) and 12.5mm (Also 10mm) Nikon NAV HW's as my first 2 eyepieces and building my set around that base. I am not starting from scratch. I have had some of my current eyepieces for about 20 years. I don't need to re invent the wheel and start over for the small gains I would make. Particularly so, having regard to the fact that I now do about 1/5th of the observing I did 10 - 20 years ago.

For those that can afford the cost of admission and who own high quality telescopes and want the best possible eyepiece to go with their premium telescopes, then this is the eyepiece to buy. It has no equal in the current eyepiece world. The 12.5mm Docter is pretty good too and IMO runs 3rd behind the 17mm Nikon and 12.5mm Nikon, which is a small fraction behind the 17mm Nikon.

Cheers
John B
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  #22  
Old 17-02-2020, 06:27 PM
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Ukastronomer (Jeremy)
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Quote:
Originally Posted by ausastronomer View Post
Hi Jeremy,

I don't own the 17mm Nikon NAV HW. My comment which you have quoted was "The 17mm Nikon is the best eyepiece I have used".

Around this focal length, I personally either own or have exclusive use of as part of my 3RF Australia Equipment, 18mm UO HD Orthoscopic, 17mm ETHOS, 17mm Nagler T4, 14mm Pentax XW and a 13mm ETHOS.

These are all very good eyepieces. None of them are as good as the 17mm Nikon NAV HW. I gave you the reasons already. "Contrast, sharpness and throughput like a Zeiss ortho combined with a wide FOV and excellent eye relief. It gets no better in the eyepiece world." While the others are all excellent eyepieces they are all a fraction behind the Nikon. It has everything one could hope for in an eyepiece all rolled into 1 eyepiece.

If I was starting out from scratch in the modern eyepiece world I would be buying the 17mm (also 14mm) and 12.5mm (Also 10mm) Nikon NAV HW's as my first 2 eyepieces and building my set around that base. I am not starting from scratch. I have had some of my current eyepieces for about 20 years. I don't need to re invent the wheel and start over for the small gains I would make. Particularly so, having regard to the fact that I now do about 1/5th of the observing I did 10 - 20 years ago.

For those that can afford the cost of admission and who own high quality telescopes and want the best possible eyepiece to go with their premium telescopes, then this is the eyepiece to buy. It has no equal in the current eyepiece world. The 12.5mm Docter is pretty good too and IMO runs 3rd behind the 17mm Nikon and 12.5mm Nikon, which is a small fraction behind the 17mm Nikon.

Cheers
John B


Thanks, appreciated

It is always nice to know "why" someone wants a thing, and really helps people with future cvhoices.
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  #23  
Old 19-02-2020, 03:27 PM
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Don Pensack
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Originally Posted by m11 View Post
Hi Everyone,

I have been thinking of adding the Nikon nav-hw 17mm to my collection.

Was wondering if anyone has recommendations to where to buy this eyepiece locally? I saw Ageno Astro have it but the USD/AUD is kinda terrible right now.

Thanks,

M11
Excellent eyepiece.
Just be aware it requires a position farther in than the in-most setting of the Paracorr to optimize it for coma correction. Not much, though--you're only 2.5mm away from the ideal position when the Paracorr is used in setting A.
It cannot be brought to focus using a SIPS focuser without moving the SIPS lens away from the ideal position.
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  #24  
Old 20-02-2020, 09:33 PM
ausastronomer (John Bambury)
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Hi Mel and Don,

Don raises a very good point. "The 17mm Nikon can't quite reach focus due to insufficient "in travel" when used with the SIPS at its optimum setting."

This is worth mentioning, particularly for those not familiar with adjusting a Paracorr or SIPS and who wonder why the eyepiece won't reach focus, the first time they go to use.

In reality and in the field this isn't any cause for concern. As Don said it gets pretty close. To compensate, you just adjust the SIPS / Paracorr slightly off the "optimal" setting and then the eyepiece will reach focus.

In the field under real sky conditions you can't detect that the Paracorr / SIPS is set slightly off the optimal setting. Observers have been doing this for at least 20 years with the 31mm Nagler and the T1 Paracorr. I also have to do it to reach focus with my 31mm Nagler T5 and my Pentax XW's when used in both my Paracorr T1 and my Paracorr PV2008. Under the stars you don't even notice it.

Worth mentioning for sure. Not a reason not to buy the eyepiece!

Cheers
John B
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  #25  
Old 20-02-2020, 10:05 PM
m11 (Mel)
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Hi Don,

Thanks for the info regarding the parracor and sips. I haven't really used thr type 2 parracor I had.

The new scopes I am getting will have sips. Can you elaborate regarding moving the sips lens? Do you mean move the whole sips unit away of the scope focuser?

My apologies for my basic questions.

Mel

Quote:
Originally Posted by Don Pensack View Post
Excellent eyepiece.
Just be aware it requires a position farther in than the in-most setting of the Paracorr to optimize it for coma correction. Not much, though--you're only 2.5mm away from the ideal position when the Paracorr is used in setting A.
It cannot be brought to focus using a SIPS focuser without moving the SIPS lens away from the ideal position.
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  #26  
Old 20-02-2020, 10:19 PM
m11 (Mel)
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Hi John,

Thanks for the info on the parracor and sips settings. I dont have much experience with parracor and sips at all.
Can I ask in particular for sips is it just using the focuser? Not sure on parracor at all.

Thanks for the heads up, still alot to learn for this equipment for me.

Definetely planning on getting this eyepiece, something I will need to adjust and keep in mind.

Thanks,

Mel

QUOTE=ausastronomer;1463558]Hi Mel and Don,

Don raises a very good point. "The 17mm Nikon can't quite reach focus due to insufficient "in travel" when used with the SIPS at its optimum setting."

This is worth mentioning, particularly for those not familiar with adjusting a Paracorr or SIPS and who wonder why the eyepiece won't reach focus, the first time they go to use.

In reality and in the field this isn't any cause for concern. As Don said it gets pretty close. To compensate, you just adjust the SIPS / Paracorr slightly off the "optimal" setting and then the eyepiece will reach focus.

In the field under real sky conditions you can't detect that the Paracorr / SIPS is set slightly off the optimal setting. Observers have been doing this for at least 20 years with the 31mm Nagler and the T1 Paracorr. I also have to do it to reach focus with my 31mm Nagler T5 and my Pentax XW's when used in both my Paracorr T1 and my Paracorr PV2008. Under the stars you don't even notice it.

Worth mentioning for sure. Not a reason not to buy the eyepiece!

Cheers
John B[/QUOTE]
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  #27  
Old 20-02-2020, 11:45 PM
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Well............... I am leaning a lot here, thanks
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  #28  
Old 21-02-2020, 07:00 AM
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The Paracorr can be moved in and out with the focuser if an eyepiece needs to move in a bit more (like the 20mm 100 Explore Scientific, for example).
The SIPS, though, is like having a fixed Paracorr. If the eyepiece needs to move in, you bottom out. The only solution is to move the SIPS lens a bit farther away from the focuser (usually possible). You will need to "reoptimize" its position once removing that eyepiece and going back to your other eyepieces. A tiny white mark on the edge of the lens and its housing can easily facilitate that.
So, it's not impossible to use the SIPS with the 17mm Nikon, just a bit more difficult than using the standard Paracorr.
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  #29  
Old 21-02-2020, 08:37 AM
m11 (Mel)
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Thanks Don for taking time to explain how the sips and parracor work. I havent play with any of this equipment but will be getting a sips equipped scope soon.

Many thanks again
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