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2021 Eyepieces Buyer's Guide

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33 replies to this topic

#1 Starman1

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Posted 27 February 2021 - 06:32 PM

Here is the list for 2021, up to date as of Feb.27, 2021

Please let me know of omissions and errors.

I am not listing discontinued models even if there are a few still at dealers.

Attached Files


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#2 Joe47

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Posted 27 February 2021 - 06:59 PM

Here is the list for 2021, up to date as of Feb.27, 2021
Please let me know of omissions and errors.
I am not listing discontinued models even if there are a few still at dealers.



#3 Joe47

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Posted 27 February 2021 - 07:02 PM

Hi Starman,
You missed the most important Vixen eyepieces " Vixen SSW FOV 83 DEGREES"
Joe
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#4 Starman1

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Posted 27 February 2021 - 07:05 PM

Hi Starman,
You missed the most important Vixen eyepieces " Vixen SSW FOV 83 DEGREES"
Joe

Vixen announced they were discontinued about 6 months ago, long with the HRs.

There is no "End of Production" notice for SLVs and NPLs, though.


Edited by Starman1, 27 February 2021 - 07:10 PM.

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#5 Bean614

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Posted 27 February 2021 - 07:25 PM

Once again Don, a sincere Thank You for your outstanding,  comprehensive  efforts!


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#6 Napp

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Posted 27 February 2021 - 07:37 PM

Thanks, Don!



#7 Defenderslideguitar

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Posted 27 February 2021 - 07:37 PM

Don

Yes I agree with Bean 614 above. Thanks for doing yeoman's work putting this together. A fine reference indeed



#8 Speedy1985

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Posted 27 February 2021 - 07:48 PM

As a newb, having this info all in one place is invaluable and I've already saved it in my "astro" folder. Thank you.


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#9 eyeoftexas

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Posted 27 February 2021 - 11:07 PM

Christmas time in February.  Thanks for another year, Don!


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#10 rexowner

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Posted 27 February 2021 - 11:28 PM

Thank you Don. Really great info and much appreciated.

 

Not that this really means anything. because the detailed product info in the spreadsheet is

more interesting, but just out of curiosity, calculated:

- Average (mean) price of eyepiece models: $180.62 (Higher than I would have guessed)

- Std Deviation: $262.98 (lot of expensive eyepiece models out there)

* Median: $99.00 -- the same number of eyepiece models priced below $99, as greater than $99,

I guess there's something for everyone out there.  This obviously isn't weighted by quantities sold,

so I would guess that averages for that would be lower.

 

860 - 1.25" models

203 - 2" models

71 - 1.25/2" models (not a fan, so sounds good to me)


Edited by rexowner, 27 February 2021 - 11:29 PM.

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#11 thecelloronin

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Posted 04 March 2021 - 11:31 AM

Aren’t the Sterling Plossls a thing on the past? Didn’t think Long Perng was still making them.



#12 Starman1

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Posted 04 March 2021 - 12:44 PM

Aren’t the Sterling Plossls a thing on the past? Didn’t think Long Perng was still making them.

Someone should tell Long Perng, then.  Their latest wholesale catalog still lists them, with costs.

And Smart Astronomy still shows them on their website.

 

I just added another brand to the list, but there is no urgency to re-post the spreadsheet since the same eyepieces are available under other labels.

Apparently the AstroHutech ScopeTech orthoscopics are the same as the Starbase orthoscopic eyepieces sold by Takhashi.

They're 2:2 symmetrical eyepieces.


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#13 thecelloronin

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Posted 04 March 2021 - 02:15 PM

Is LP’s website the same as their wholesale catalogue? It only shows the 4mm, 12.5mm, and 20mm as available.

 

I’m not going to put hearsay against your expertise, but a few older threads had pointed towards a phase-out of at least the 25mm, 30mm and 40mm. It’s also been said that Smart Astronomy tends to keep discontinued products up on their website for reference. I’ve been poaching a 30mm for a couple of months now-which is nothing in the Astro world admittedly-but suffice it to say I have been unable to purchase it from Smart Astronomy or anywhere else.

 

https://www.cloudyni...ing-phased-out/

https://www.cloudyni...ng-plossl-30mm/

 

So I guess there are a few Sterlings still kicking around, but so far as I can tell nothing longer than 20mm. 


Edited by thecelloronin, 04 March 2021 - 02:26 PM.


#14 Starman1

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Posted 04 March 2021 - 02:55 PM

LP's website is not the same as their wholesale catalog (which still lists every focal length).

They may not have inventory on the shelf for some of the sizes, but it's likely they'll make whatever is ordered.

Probably not in small quantities, though.


Edited by Starman1, 04 March 2021 - 02:57 PM.

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#15 thecelloronin

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Posted 04 March 2021 - 03:04 PM

That makes perfect sense, thanks.



#16 sunrag

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Posted 05 March 2021 - 02:19 PM

Thank you Starman1! This is great work.

#17 Bill Lee

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Posted 06 March 2021 - 03:32 AM

Don, could you please upload your past spreadsheets for previous years? I’d like to see older eyepieces



#18 COViewer

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Posted 11 March 2021 - 10:34 AM

Great resource, thank you!



#19 Starman1

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Posted 11 March 2021 - 12:58 PM

Don, could you please upload your past spreadsheets for previous years? I’d like to see older eyepieces

I typically update the spreadsheet and rename it, so I don't have most of the earlier years.

They may be in the CN Archives if you look for them.

I do have one from ~2009 (I think) I could send you if you send me your email address in a private message.

In that era, I also had buyer's guides to a lot of other products included.



#20 thecelloronin

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Posted 20 March 2021 - 06:23 PM

I'm guessing I should trust the calculated field stops over the manufacturer specs, pretty much every time?

 

Manufacturer stats say the 35 Pan and 30 UFF pretty much have the same field stop (38.7mm vs 38.0mm), leading many on these forums to conclude the UFF all but replaces the Pan.

 

Yet, the calculated field stops say 41.5mm for the Pan, and 36.7mm for the UFF. In my paracorr'd dob, that's 1.65° vs 1.46° TFOV. Just using this as a common example to illustrate the often considerable differences between the two specs.



#21 Starman1

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Posted 21 March 2021 - 04:02 PM

I'm guessing I should trust the calculated field stops over the manufacturer specs, pretty much every time?

 

Manufacturer stats say the 35 Pan and 30 UFF pretty much have the same field stop (38.7mm vs 38.0mm), leading many on these forums to conclude the UFF all but replaces the Pan.

 

Yet, the calculated field stops say 41.5mm for the Pan, and 36.7mm for the UFF. In my paracorr'd dob, that's 1.65° vs 1.46° TFOV. Just using this as a common example to illustrate the often considerable differences between the two specs.

I have the calculated field there in case the manufacturer doesn't specify a field stop diameter.

It is inaccurate, because it is computed based on focal length and apparent field of view, and that can be as much as 15% off.

I need to correct the APM UFF figure.  2 users here on CN have measured it at 36.9mm.

The 35mm Panoptic is 38.7mm, or 4.9% wider.

 

If you are comparing two eyepieces with no mfr's field stop dimension noted, then using the calculated field stop will give you a relative comparison, but neither figure will be correct.  Just know that in advance.

I am trying to update the figures as users measure the field stops to get actual numbers, but it is a never-ending process.

It's the same with apparent field, where a significant number of them are simply wrong.  I enter what the mfr claims, but that is often off by as much as 4° from actual.

 

The only way to derive a correct field stop diameter is to time the passage of a star on the celestial equator and get a true field for the eyepiece.

Then, 

[True Field (in degrees) x Telescope focal length (in mm)] / 57.296 = Field stop in mm.

 

You're making me think, however, that I should eliminate the calculated field stop column.

 

TO MAKE THE FIGURE MORE ACCURATE IN THE CALCULATED FIELD STOP ENTER THIS FORMULA IN CELL J6 AND THEN DRAG THE FORMULA TO THE BOTTOM OF THE SPREADSHEET:

=S6*P6/57.296


Edited by Starman1, 21 March 2021 - 05:32 PM.

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#22 thecelloronin

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Posted 21 March 2021 - 04:41 PM

Either eliminate it due to upkeep and confusion, or add in a disclaimer in the first post that contains the link.

 

In any case, thanks for clearing that up, and for the spreadsheet itself. Endlessly valuable!



#23 Voyager 3

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Posted 22 March 2021 - 07:43 AM

I have the calculated field there in case the manufacturer doesn't specify a field stop diameter.
It is inaccurate, because it is computed based on focal length and apparent field of view, and that can be as much as 15% off.
I need to correct the APM UFF figure. 2 users here on CN have measured it at 36.9mm.
The 35mm Panoptic is 38.7mm, or 4.9% wider.

If you are comparing two eyepieces with no mfr's field stop dimension noted, then using the calculated field stop will give you a relative comparison, but neither figure will be correct. Just know that in advance.
I am trying to update the figures as users measure the field stops to get actual numbers, but it is a never-ending process.
It's the same with apparent field, where a significant number of them are simply wrong. I enter what the mfr claims, but that is often off by as much as 4° from actual.

The only way to derive a correct field stop diameter is to time the passage of a star on the celestial equator and get a true field for the eyepiece.
Then,
[True Field (in degrees) x Telescope focal length (in mm)] / 57.296 = Field stop in mm.

You're making me think, however, that I should eliminate the calculated field stop column.

TO MAKE THE FIGURE MORE ACCURATE IN THE CALCULATED FIELD STOP ENTER THIS FORMULA IN CELL J6 AND THEN DRAG THE FORMULA TO THE BOTTOM OF THE SPREADSHEET:
=S6*P6/57.296

How to get the true field in degrees ?

Edited by Voyager 3, 22 March 2021 - 07:44 AM.


#24 Starman1

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Posted 22 March 2021 - 11:07 AM

How to get the true field in degrees ?

That's column P.



#25 thecelloronin

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Posted 22 March 2021 - 12:12 PM

How to get the true field in degrees ?

Don't forget to input your scope FL and f ratio at the top, it will automatically populate the list accordingly.




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