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2019 Eyepiece Buyer's Guide

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#101 25585

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Posted 26 February 2020 - 08:13 AM

What new lines came out in 2019?



#102 Starman1

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Posted 27 February 2020 - 10:25 AM

couple examples: new line from Kasai, new line from OVL.

A couple others I can't remember this moment.

However, seriously, the number of eyepieces will slowly dwindle if the Covid-19 virus becomes a world-wide pandemic and 

countries start closing their borders to Chinese goods. 

If it turns out the virus cannot be easily transmitted on the surfaces of boxes and eyepieces, perhaps not, but I fear the worst.

We will see.


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#103 25585

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Posted 27 February 2020 - 12:55 PM

couple examples: new line from Kasai, new line from OVL.

A couple others I can't remember this moment.

However, seriously, the number of eyepieces will slowly dwindle if the Covid-19 virus becomes a world-wide pandemic and 

countries start closing their borders to Chinese goods. 

If it turns out the virus cannot be easily transmitted on the surfaces of boxes and eyepieces, perhaps not, but I fear the worst.

We will see.

Good point. Production will also be affected, for components if not whole units. Domestic pre-owned markets will benefit though. We survived SARS, Swine Flu etc. though.



#104 daslolo

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Posted 08 March 2020 - 09:24 PM

You don't have zoom eyepieces on your list.

If you put that on Google Sheet, I'll add the eyepieces I've used.



#105 Starman1

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Posted 09 March 2020 - 02:17 PM

Huh?  There are 35-40 different zooms in the list.

What zoom do you have that isn't on the list?

I don't have, and won't have, on the list, spotting scope-specific zoom eyepieces that require special adapters to use in telescopes.



#106 daslolo

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Posted 09 March 2020 - 03:13 PM

Huh?  There are 35-40 different zooms in the list.

What zoom do you have that isn't on the list?

I don't have, and won't have, on the list, spotting scope-specific zoom eyepieces that require special adapters to use in telescopes.

None, I just found the meade 4000 after sorting by type.

 

Its weight is 206g

 

Your xl is now on google sheet! https://bit.ly/2W0fRU6

If you want ownership, pm me your email address and I'll transfer over.

In any case you can replace the formula for field stop with this mouthful, it'll remove error and handle zoom eyepieces:

 

=IFERROR(CONCATENATE(TEXT(index(SPLIT(F1144, "-"),0,1)*index(SPLIT(D1144,"-"),0,1)/57.296,"0.0"), IFERROR(CONCATENATE("-",TEXT(index(SPLIT(F1144, "-"),0,2)*index(SPLIT(D1144,"-"),0,2)/57.296,"0.0"))),""))



#107 Starman1

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Posted 09 March 2020 - 03:51 PM

My version of Excel says that isn't a valid formula.

Also, the field stop of a typical zoom is not uniform over the focal length range, so a calculation would have to vary.

 

There is no ownership and you are free to borrow as needed.



#108 GrayRonk

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Posted 13 March 2020 - 09:10 PM

Don, the list states that the AMP XWA HDC 100° has a 7mm coming. Any idea when that will be?

 

Oh, and thanks for the list!


Edited by GrayRonk, 13 March 2020 - 09:11 PM.


#109 Dirtydrywaller

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Posted 13 March 2020 - 09:16 PM

Thank you!  This is extremely helpful for noobs. :)  


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#110 Starman1

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Posted 14 March 2020 - 12:52 AM

Don, the list states that the AMP XWA HDC 100° has a 7mm coming. Any idea when that will be?

Oh, and thanks for the list!

KUO says that they need to recoup some profits before they introduce more focal lengths so I wouldn't look for a 7mm this year. It might be a while before we even see more 20s thanks to the Covid19 virus.
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#111 eblanken

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Posted 27 March 2020 - 10:43 PM

I just want to add my thanks to Don for this very valuable eyepiece guide!

+1 on the thanks to Don !!!



#112 Starman1

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Posted 28 March 2020 - 12:06 PM

I'll post the 2020 version in a couple weeks.



#113 gervase

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Posted 03 June 2020 - 09:31 AM

Awesome Don.  Thanks.

JG
 



#114 Starman1

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Posted 03 June 2020 - 10:14 AM

Awesome Don. Thanks.
JG

It posted a while ago. Same forum. See post 28 on that thread.

#115 Mrrodgerdelodger

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Posted 19 June 2020 - 06:48 AM

Wow so much work there. What a great help to all on this forum you are sir!
Thank you so much

John

#116 Rcooch

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Posted 26 September 2020 - 09:59 AM

Don thanks, Excellent chart!! I was wondering if there are any charts that can tell you what eyepiece is compatible with a particular type and size scope? LOL sort of like eyepieces for dummies! Thanks again



#117 Starman1

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Posted 26 September 2020 - 11:49 AM

First, you should discard the 2019 Guide in favor of the 2020 Guide, also on this site.

And download the revised copy in post #28 on the 2020 Guide thread.

Second, I'm not sure what you are asking, but if you mean what eyepieces are compatible with short f/ratios and what eyepieces are not, then:

--there is no consensus as to compatibility.  Some people ignore aberrations easily, while others are bothered by them.

--some people have long f/ratio scopes and don't care

--no manufacturer states the minimum (or Critical) f/ratio the eyepiece is designed for

--the best you can do is to look at the size of the eyepiece (2" eyepieces don't fit in 1.25" focusers) and the focal length.

The normal range is for focal lengths to fall between 6-7x the f/ratio of the scope and 0.5x the f/ratio.  I.e. at f/5 from a 30-35mm down to 2.5mm.


Edited by Starman1, 26 September 2020 - 11:49 AM.


#118 Eclipsed

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Posted 02 October 2020 - 09:19 AM

Here is the updated, 2019 version of the Eyepiece Buyer's Guide.

 

Some notes:

There seem to be more eBay and Amazon brands than ever.  Most fluctuate in price and models available.

IF you know what you're doing, there are some bargains here, since, in many cases, you're buying directly from the Chinese manufacturer.

I mention many of these brands, but unless they have a website and list their eyepieces, I didn't include all the items.

 

A few brands disappeared.  A couple new ones showed up.  Some models and sizes were dropped, others added.

One brand changed due to a purchase of the company (Docter>>Noblex)

 

If you enter your telescope's focal length and f/ratio in the boxes in the upper left, and click on any other box, all the fields will populate.

 

The report is ordered by brand, then model, then focal length.  It's an Excel spreadsheet, so can be rearranged to suit your purposes.

If you click "Do not save" when you exit, such temporary changes will not be preserved.

 

I added a column for weights in grams.  I entered data that I had.  Many others might be obtainable on line, but searching for the data would have slowed this down by months

since I have only a little time each month to devote to keeping it current.   I did add the TeleVue 11mm Apollo 11 eyepiece right at the end.

 

Enjoy.

 

Don 

Great eyepiece list!  Thanks Don.

I just downloaded and there's a simple typo on line 311.  The Celestron Omni Plossl 40mm probably is $52.95 (not $5,295!).

Again, thanks.  It's a very useful listing.



#119 Starman1

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Posted 02 October 2020 - 01:34 PM

Great eyepiece list!  Thanks Don.

I just downloaded and there's a simple typo on line 311.  The Celestron Omni Plossl 40mm probably is $52.95 (not $5,295!).

Again, thanks.  It's a very useful listing.

Discard the 2019 version and download the 2020 version, which is also a "sticky" at the top of the forum.

See the most updated version of that in post #28 on that thread.

I don't see the error you mention in that spreadsheet.

I wish people would ignore the 2019 version--it's very dated.

I'm working on the 2021 version now for posting in late winter.


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#120 BradFran

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Posted 04 October 2020 - 04:47 PM

As always, great work Don. Mods should just un-sticky the 2019.


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#121 Starman1

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Posted 04 October 2020 - 06:11 PM

Yes, they should.


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