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Meade 26mm 100AFOV

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#1 faackanders2

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Posted 06 April 2020 - 05:49 PM

https://www.meade.co...piece-26mm.html

 

Any thoughts on this eyepiece.  Wider TFOV than TV, APM, ES  2" eyepieces.


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#2 Migwan

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Posted 06 April 2020 - 06:32 PM

Wonder how much it weighs?   jd



#3 Jon Isaacs

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Posted 06 April 2020 - 06:38 PM

Wonder how much it weighs?   jd

 

Not much. Probably 1.5 pounds or so, it doesn't look any bigger than the 21mm.  It's 8 elements and looks pretty compact...

 

I don't hear good things about the Meade 100° eyepieces.

 

Jon


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#4 John Rogers

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Posted 06 April 2020 - 06:57 PM

Interesting that the specifications page does not include the weight.  That is a critical consideration for some telescopes.

 

Also, there is a discrepancy with the number of elements.  The description claims 8, but the specification indicates 7.


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#5 Msprinkle1

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Posted 06 April 2020 - 08:03 PM

As the mega-wide market expands, we will all benefit in time.  Hopefully lessons will be learned and improvements will be made. I am very interested in seeing a review.  


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#6 ewave

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Posted 06 April 2020 - 09:15 PM

Here is the original post for the MWA by Meade:

 

 https://www.cloudyni...rrived/?hl= mwa


Edited by ewave, 06 April 2020 - 09:17 PM.

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#7 Msprinkle1

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Posted 07 April 2020 - 06:51 AM

Here is the original post for the MWA by Meade:

 

 https://www.cloudyni...rrived/?hl= mwa

That hurt my brain.

In the end, I see the results were so-so.  I am still confident that 100 degree technology will advance and prices will fall in time.


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#8 faackanders2

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Posted 07 April 2020 - 11:01 AM

Interesting that the specifications page does not include the weight.  That is a critical consideration for some telescopes.

 

Also, there is a discrepancy with the number of elements.  The description claims 8, but the specification indicates 7.

I would believe the specification of 7 elements because it is specific to the 26mm 100 AFOV eyepiece.  The description is more general for the Meade 100 AFOV series.  But they should revise/update to make correct for both.



#9 faackanders2

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Posted 07 April 2020 - 11:08 AM

That hurt my brain.

In the end, I see the results were so-so.  I am still confident that 100 degree technology will advance and prices will fall in time.

$259 for a 26mm 100AFOV eyepiece seems like a good price.

The next closest thing is ES 25mm 100AFOV at $725 at almost 3x the price!

I wish someone or a magazine would compare both (hint, hint).


Edited by faackanders2, 07 April 2020 - 11:15 AM.

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#10 junomike

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Posted 07 April 2020 - 11:25 AM

$259 for a 26mm 100AFOV eyepiece seems like a good price.

The next closest thing is ES 25mm 100AFOV at $725 at almost 3x the price!

I wish someone or a magazine would compare both (hint, hint).

Problem is the ES 25mm holds true to the AFOV (100°) which isn't the case for the Meade 21mm 100° and most likely the 26mm as well.

 

See previous thread (especially Post #14)


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#11 Jon Isaacs

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Posted 07 April 2020 - 11:42 AM

$259 for a 26mm 100AFOV eyepiece seems like a good price.

The next closest thing is ES 25mm 100AFOV at $725 at almost 3x the price!

I wish someone or a magazine would compare both (hint, hint).

 

The Explore Scientific is also much heavier and is known to offer a full 100 degree field of view.  $259 combined with the size and weight along with the limited number of elements ought to be a clue that something ain't quite right here. 

 

Jon 


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#12 SeattleScott

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Posted 07 April 2020 - 11:50 AM

And 7 elements is not really adequate for 100 AFOV, especially with the ER they advertise. So it will surely disappoint in fast scopes. Possibly moderate ones too.

Based on the MWA reputation for less than advertised AFOV and ER, as well as EOFB, not many here are going to give it a shot. This really falls into the budget hyperwide category like Zhumell or WO.

Hyperwides have been around long enough that there is healthy competition. You have TV and Nikon at the high end, maybe Tak and ES depending on whether 90-92 counts as hyperwide. Then you have ES and Lunt/APM/SV etc rebrands in the mid tier. Finally the budget lines like Meade, Zhumell and WO. So there is healthy competition at all levels.

It just isn’t clear to me that a 25mm hyperwide is going to be an excellent performer in fast scopes at any price. I suspect there is a reason TV stopped at 21mm.

Scott
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#13 faackanders2

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Posted 07 April 2020 - 12:02 PM

Problem is the ES 25mm holds true to the AFOV (100°) which isn't the case for the Meade 21mm 100° and most likely the 26mm as well.

 

See previous thread (especially Post #14)

Previous thread above seems to imply Meade 26mm 100 AFOV MAY really only be 90 AFOV (like Meade 21mm 100AFOV).

Otherwise for the price I was willing to try it, but now I have doubts.  Thought Meade 26mm 100 AFOV may be closer to ES 25mm 100AFOV and might even use the same lenses (and may be off on mm power not AFOV).  Would really like to see comparison of the two.  And wonder if TV will jump into this niche area, since there are now two competitors there.


Edited by faackanders2, 07 April 2020 - 03:09 PM.


#14 SeattleScott

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Posted 07 April 2020 - 12:42 PM

I doubt it. TV has long prided themselves on only making eyepieces that perform well down to F4. You might debate how well a couple of their offerings really deliver on that promise, but the point is that if they can’t make it perform well at F4 they probably won’t make it. Which is why they stopped at 21mm from what I understand. There are a lot of big, fast Dob owners out there, and TV wants them to be able to buy with confidence.

Scott
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#15 junomike

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Posted 07 April 2020 - 03:01 PM

Previous thread above seems to imply Meade 26mm 100 AFOV MAY really only be 90 AFOV (like Meade 21mm 100AFOV).

Otherwise for the price I was willing to try it, but now I have doubts.  Thought Meade 26mm 100 AFOV may be closer to ES 25mm 100AFOV and might even use the same lenses (and may be off on mm power not AFOV).  Would really like to see comparison of the two.  An wonder if TV will jump into this niche area, since there are now two competitors there.

Hence my "Most likely the 26mm as well).

The fact they don't list the Field Stop has me skeptical but only someone with both (ES 25 100, Meade 26 100) will know for sure.


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#16 Jon Isaacs

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Posted 07 April 2020 - 03:30 PM

Previous thread above seems to imply Meade 26mm 100 AFOV MAY really only be 90 AFOV (like Meade 21mm 100AFOV).

Otherwise for the price I was willing to try it, but now I have doubts.  Thought Meade 26mm 100 AFOV may be closer to ES 25mm 100AFOV and might even use the same lenses (and may be off on mm power not AFOV).  Would really like to see comparison of the two.  And wonder if TV will jump into this niche area, since there are now two competitors there.

 

If it used the same glass, then it would weigh the same and wouldn't cost 1/3rd the price.  One has to have a certain amount of sense.  

 

In terms of TeleVue, I believe they have said that there is not sufficient room in a 2 inch barrel to design an eyepiece that meets their standards.  The stories I am read concerning the ES 25mm 100 degree is that it's not as clean and sharp across the field of view as the 20mm ES 100 which is not as clean and sharp as the 21mm Ethos.  The latter two I have owned.

 

Jon


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#17 Starman1

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Posted 07 April 2020 - 03:37 PM

Previous thread above seems to imply Meade 26mm 100 AFOV MAY really only be 90 AFOV (like Meade 21mm 100AFOV).

Otherwise for the price I was willing to try it, but now I have doubts.  Thought Meade 26mm 100 AFOV may be closer to ES 25mm 100AFOV and might even use the same lenses (and may be off on mm power not AFOV).  Would really like to see comparison of the two.  An wonder if TV will jump into this niche area, since there are now two competitors there.

Tele Vue has already said that 21mm was the limit of the design and that they could not go longer without many compromises.

Given the edge vignetting and outer field problems with the 25mm ES, and my experience with the 21mm Ethos versus the 17mm Ethos, it is obvious that

21mm is not really the limit for the design, merely where TeleVue decided to draw the line.

So I would not look for TeleVue to expand the Ethos line into longer focal lengths.



#18 faackanders2

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Posted 08 April 2020 - 08:18 PM

Previous thread above seems to imply Meade 26mm 100 AFOV MAY really only be 90 AFOV (like Meade 21mm 100AFOV).

Otherwise for the price I was willing to try it, but now I have doubts.  Thought Meade 26mm 100 AFOV may be closer to ES 25mm 100AFOV and might even use the same lenses (and may be off on mm power not AFOV).  Would really like to see comparison of the two.  And wonder if TV will jump into this niche area, since there are now two competitors there.

ES 25mm 100AFOV - No mention of number of elements nor lenses:

Item Number EPWP10025–01
Focal Length 25mm
Length 140mm
Width 73mm
Weight 41.5oz; 1177g
Barrel Size 2.00
Eye Relief 14.5mm

 

I wonder how much Meade 26mm 100AFOV differs?
Field Stop Diameter 41mm



#19 faackanders2

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Posted 08 April 2020 - 08:21 PM

ES 25mm 100AFOV - No mention of number of elements nor lenses:

Item Number EPWP10025–01
Focal Length 25mm
Length 140mm
Width 73mm
Weight 41.5oz; 1177g
Barrel Size 2.00
Eye Relief 14.5mm

 

I wonder how much Meade 26mm 100AFOV differs?
Field Stop Diameter 41mm

26mm Meade 1200AFOV:

Series Series 5000 Mega Wide Angle Eyepieces
Focal Length 26mm
Barrel Size 2"
Apparent FOV 100°
Eye Relief 25mm (Much larger than 14.5mm)
# of Elements 7
Optical Coatings Fully Multi-Coated
Blackened Edges Yes
Parfocal Yes
Waterproof Yes
UPC 709942100549



#20 Starman1

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Posted 09 April 2020 - 01:26 AM

ES 25mm 100AFOV - No mention of number of elements nor lenses:

Item Number EPWP10025–01
Focal Length 25mm
Length 140mm
Width 73mm
Weight 41.5oz; 1177g
Barrel Size 2.00
Eye Relief 14.5mm

 

I wonder how much Meade 26mm 100AFOV differs?
Field Stop Diameter 41mm

The 25mm is 10 elements in 7 groups.



#21 Jon Isaacs

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Posted 09 April 2020 - 07:14 AM

26mm Meade 1200AFOV:

Series Series 5000 Mega Wide Angle Eyepieces
Focal Length 26mm
Barrel Size 2"
Apparent FOV 100°
Eye Relief 25mm (Much larger than 14.5mm)
# of Elements 7
Optical Coatings Fully Multi-Coated
Blackened Edges Yes
Parfocal Yes
Waterproof Yes
UPC 709942100549

Apparent FOV 100°
Eye Relief 25mm (Much larger than 14.5mm)

 

Do you believe it?

 

I calculate that a 25mm of eye relief with a 100 degree AFoV requires a 42mm eye lens.  

 

I suggest you spend the $259, measure the AFoV, the eye relief, the eye lens diameter, the weight and report back.

 

jon



#22 25585

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Posted 09 April 2020 - 08:08 AM

This is the ES100 20mm. How much different the 25mm is, does anyone know or can guess?

Attached Thumbnails

  • ES_100.jpg


#23 Starman1

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Posted 09 April 2020 - 10:01 AM

Apparent FOV 100°
Eye Relief 25mm (Much larger than 14.5mm)

 

Do you believe it?

 

I calculate that a 25mm of eye relief with a 100 degree AFoV requires a 42mm eye lens.  

 

I suggest you spend the $259, measure the AFoV, the eye relief, the eye lens diameter, the weight and report back.

 

jon

Nope.  A 100° eyepiece with a 25mm eye relief needs a 59.6mm eye lens (2.35")

tan0.5AF = 0.5LD / ER, where AF = apparent field, LD = lens diameter, and ER = eye relief.

 

The 26mm Meade has nowhere near that eye lens diameter.

https://www.meade.co...piece-26mm.html

Looks like MAYBE 35mm = 14.7mm eye relief.

 

Since most of the other 100° eyepieces have 14.5-15mm eye reliefs, I'd guess that was closer.

Now, if the actual apparent field is smaller, say 88-90°, then eye relief could be longer, but still not more than 20-21mm.

And the eye lens appears to be recessed several millimeters, which reduces the effective eye relief.


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#24 Starman1

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Posted 09 April 2020 - 10:05 AM

This is the ES100 20mm. How much different the 25mm is, does anyone know or can guess?

The 25mm has 14.5mm of eye relief from the glass.

I attach a spec chart for ES eyepieces

Attached Files


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#25 Jon Isaacs

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Posted 09 April 2020 - 11:59 AM

Nope.  A 100° eyepiece with a 25mm eye relief needs a 59.6mm eye lens (2.35")

tan0.5AF = 0.5LD / ER, where AF = apparent field, LD = lens diameter, and ER = eye relief.

 

 

Don:

 

Thanks for catching my error. I divided by tan(50°) when I should have multiplied.

 

I can blame either  early morning fogginess or cabin fever.

 

Take your pick.. :)

 

Jon




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