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Low power Eyepieces for 102mm f/7

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23 replies to this topic

#1 Distortion78

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Posted 09 April 2020 - 10:18 PM

Just picked up a 12mm Delos and a 7mm Delite which are both wonderful! Thanks to Don for the quick shipping and great service on those! Will undoubtedly pick up more of both those lines in the future.

Lowest power eyepiece I’m using is a 20mm Pentax UW which does look nice in my scope for sure. I have been thinking of a 24mm Panoptic and possibly a 31mm Nagler. I am not ruling out the 30mm Pentax UW now that they’ve brought those back. Has anyone used one of the newer Pentax UW 30 or 40mm? I do hear nice things about the APM Ultra flat field eyepieces as well.

At this point mainly looking for decent FOV with clear views to the edge.

As a last note buying eyepieces is addictive. Please help. Help me find the right ones obviously.
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#2 SeattleScott

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Posted 09 April 2020 - 10:51 PM

Any of those will be excellent at F7. There isn’t a wrong choice. Pretty much decide on how much AFOV you want/can afford. The 31 Nagler is heavy. But all of those are considered premium and will deliver outstanding views.

Scott

#3 scngc7317

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Posted 09 April 2020 - 11:33 PM

As a last note buying eyepieces is addictive. Please help   rofl2.gif rofl2.gif rofl2.gif

 

3520

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#4 luxo II

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Posted 10 April 2020 - 12:28 AM

As above most play nice at f/7 but there are differences when considering issues such as sharpness, jelly-bean or blackouts, and comfort when used for a long time.

For the maximum field of view available in a 2” barrel you don’t need to pay a lot to get something nice, either. IMHO the very good include:

- TMB Paragon 40mm, 70 degree AFoV
- Prostar SWA 38mm 70 degree AFoV,
- Vixen LV 50mm - oldie but a goodie, diamonds on black velvet.

The 30mm ultra flat (APM or Altair Astro versions) are also very good.

There are also some shockers which you should steer clear of, however.

Edited by luxo II, 10 April 2020 - 12:32 AM.


#5 Jon Isaacs

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Posted 10 April 2020 - 04:07 AM

As above most play nice at f/7 but there are differences when considering issues such as sharpness, jelly-bean or blackouts, and comfort when used for a long time.

For the maximum field of view available in a 2” barrel you don’t need to pay a lot to get something nice, either. IMHO the very good include:

- TMB Paragon 40mm, 70 degree AFoV
- Prostar SWA 38mm 70 degree AFoV,
- Vixen LV 50mm - oldie but a goodie, diamonds on black velvet.

The 30mm ultra flat (APM or Altair Astro versions) are also very good.

There are also some shockers which you should steer clear of, however.

 

At F/7, these are not in the same class with some of the others mentioned.  

 

I like the 35mm Panoptic at F/7.  It's not quite as wide as the 31mm Nagler etc, or the 41mm Panoptic etc but it provides a reasonable 5mm exit pupil at 20x with a 3.1 degree AFoV and it's very sharp off-axis.  

 

Jon


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#6 MarkGregory

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Posted 10 April 2020 - 04:13 AM

As a last note buying eyepieces is addictive. Please help   rofl2.gif rofl2.gif rofl2.gif

 

So, so you take all of these outside when you are observing? LOL 


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#7 25585

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Posted 10 April 2020 - 05:00 AM

As a last note buying eyepieces is addictive. Please help   rofl2.gif rofl2.gif rofl2.gif

 

Not even 100 there....  


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#8 25585

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Posted 10 April 2020 - 05:05 AM

Just picked up a 12mm Delos and a 7mm Delite which are both wonderful! Thanks to Don for the quick shipping and great service on those! Will undoubtedly pick up more of both those lines in the future.

Lowest power eyepiece I’m using is a 20mm Pentax UW which does look nice in my scope for sure. I have been thinking of a 24mm Panoptic and possibly a 31mm Nagler. I am not ruling out the 30mm Pentax UW now that they’ve brought those back. Has anyone used one of the newer Pentax UW 30 or 40mm? I do hear nice things about the APM Ultra flat field eyepieces as well.

At this point mainly looking for decent FOV with clear views to the edge.

As a last note buying eyepieces is addictive. Please help. Help me find the right ones obviously.

Pentax XW 30 & 40 are great. They are luxurious immersive viewing, the 40mm is my favourite.

 

Can't help with addiction....  



#9 russell23

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Posted 10 April 2020 - 05:19 AM

In my 102mm F/7 APO’s the 30mm APM UFF has been the best low magnification eyepiece.  It gives 24x and a 3.0 deg TFOV.  I tried the 40 XW in the scope, but the 30mm APM is better at the edges.


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#10 Mr. Mike

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Posted 10 April 2020 - 07:03 AM

At F/7, these are not in the same class with some of the others mentioned.  

 

I like the 35mm Panoptic at F/7.  It's not quite as wide as the 31mm Nagler etc, or the 41mm Panoptic etc but it provides a reasonable 5mm exit pupil at 20x with a 3.1 degree AFoV and it's very sharp off-axis.  

 

Jon

Agreed here.  For a lower cost option the ES68 series get good reviews too.  Not quite as good but very respectable compared to the top dogs.  27 Panoptic is another solid choice. 



#11 James1996

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Posted 10 April 2020 - 07:49 AM

I have a ES 68 24mm eyepiece and love it if that 's to high a magnification or not wide enough for ya maybe try the ES 68 34mm I've heard people say it's almost as good as the 35mm Panoptic.



#12 russell23

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Posted 10 April 2020 - 08:17 AM

I have a ES 68 24mm eyepiece and love it if that 's to high a magnification or not wide enough for ya maybe try the ES 68 34mm I've heard people say it's almost as good as the 35mm Panoptic.

The 34mm ES68 is the worst of the line in my experience - by a fairly large amount.   It is not as good at the edges as the other focal lengths and the sky background is not as clean.   The other ES68 focal lengths are perhaps ~90% as good as the Panoptics.  The 34mm is ~60% of the 35mm Pan.  The eyepiece that should be looked at here is the 30mm APM UFF.  It costs $229 and is sharp very close to the field stop in a 102mm f/7 APO.  The field stop of the 30mm APM is 38mm while the 34mm ES68 has a 38.6mm field stop so the TFOV is almost the same with both eyepieces.


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#13 James1996

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Posted 10 April 2020 - 08:28 AM

The 34mm ES68 is the worst of the line in my experience - by a fairly large amount.   It is not as good at the edges as the other focal lengths and the sky background is not as clean.   The other ES68 focal lengths are perhaps ~90% as good as the Panoptics.  The 34mm is ~60% of the 35mm Pan.  The eyepiece that should be looked at here is the 30mm APM UFF.  It costs $229 and is sharp very close to the field stop in a 102mm f/7 APO.  The field stop of the 30mm APM is 38mm while the 34mm ES68 has a 38.6mm field stop so the TFOV is almost the same with both eyepieces.

Huh really? I knew it wasn't supposed to be quite as good as the 24mm but I haven't seen anyone say it was that bad before. Darn and I was considering it myself, the more ya learn I guess.



#14 Glass Man

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Posted 10 April 2020 - 09:44 AM

Another vote for the APM UFF 30mm. It’s what I use in my SV102 Access for my low power wide field EP. It provides 24x and I’m not sure you need to go lower than that.

 

Best regards, Karl



#15 russell23

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Posted 10 April 2020 - 10:13 AM

Huh really? I knew it wasn't supposed to be quite as good as the 24mm but I haven't seen anyone say it was that bad before. Darn and I was considering it myself, the more ya learn I guess.

Keep in mind I'm just one data point.  I thought the 28mm and 20mm were the best of the line.  The 24mm is really good too.  The 16 is good but the eye relief is tight.  I compared with the Pans: 19/20mm, 24mm, 27/28mm, and 34/35mm.  The 34mm/35mm was where I felt there was the biggest performance difference.  The others were pretty close.  Mostly the Pans held sharpness closer to or to the field stop and had a little cleaner sky background.   But in terms of TFOV.  In a 102mm f/7 the 30mm APM UFF gives you a 3.05 deg field while the 34mm ES68/35mm Pan gives you a 3.10 deg TFOV so that is note enough difference to be meaningful.


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#16 russell23

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Posted 10 April 2020 - 11:03 AM

I thought post #43 was pretty impactful in this thread regarding the 30mm APM UFF:

 

https://www.cloudyni...yepieces/page-2

 

Particularly in the full context of the post when toward the end of the post it is stated "I should have paid more attention ..."

 

There are many positive comments on that 30mm APM UFF.  One other thing I really like about it is the light weight compared to the 2" XW, 35mm Pan, 31mm Nagler and 41mm Pan.

 

Another factor for me is that the TFOV with the 40mm XW and 41mm Pan is ~3.7 deg  vs. 3.0 with the 30mm APM.  That can be a useful difference for some targets, but not enough for me to justify the extra weight, cost, and larger exit pupil.  For most targets that difference is irrelevant with the 102mm f/7 APO.


Edited by russell23, 10 April 2020 - 11:04 AM.


#17 Jon Isaacs

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Posted 10 April 2020 - 11:15 AM

 There are many positive comments on that 30mm APM UFF.  One other thing I really like about it is the light weight compared to the 2" XW, 35mm Pan, 31mm Nagler and 41mm Pan.

 

 

Besides the weight, there's the cost. It is possible if one is patient to find a used 35mm Panoptic for around $225 but the 31mm used is double that and 41mm is close to double that. 

 

The 30 mm APM seems like a good fit for a 4 inch F/7 ED. Not quite a 31 mm Nagler but lighter, more affordable and a solid eyepiece in its own right.

 

Jon 



#18 Furio

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Posted 10 April 2020 - 11:52 AM

I have a 102mm F6.5 achro and was considering Q70 32 & 38 mm, based on advices I got at my astro shop. I know it's not in the same ballpark price & quality wise but maybe it could be a nice option at F7. Throwing this here just curious about the opinions on these as well ;)
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#19 Adam Taylor

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Posted 10 April 2020 - 03:46 PM

Really like the ES68 28mm in my 4" f/7.  At 16 oz, its weight is on par with the two Morpheus' with 2" adapters I use in the same scope.



#20 SteveG

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Posted 10 April 2020 - 04:01 PM

The 34mm ES68 is the worst of the line in my experience - by a fairly large amount.   It is not as good at the edges as the other focal lengths and the sky background is not as clean.   The other ES68 focal lengths are perhaps ~90% as good as the Panoptics.  The 34mm is ~60% of the 35mm Pan.  The eyepiece that should be looked at here is the 30mm APM UFF.  It costs $229 and is sharp very close to the field stop in a 102mm f/7 APO.  The field stop of the 30mm APM is 38mm while the 34mm ES68 has a 38.6mm field stop so the TFOV is almost the same with both eyepieces.

 

 

Huh really? I knew it wasn't supposed to be quite as good as the 24mm but I haven't seen anyone say it was that bad before. Darn and I was considering it myself, the more ya learn I guess.

While it is certainly better than a lot of the low-cost options mentioned in this thread, it does suffer from a washed-out background and edge astigmatism, as compared to the other ES/68's I've owned. I'm going to look at the APM 30 this year myself. Most of my viewing is done with a N22T4, so the 30 mm range is not as important for me.

 

I haven't looked through one, but the ES 28/68 gets excellent reviews here.


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#21 James1996

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Posted 10 April 2020 - 04:10 PM

While it is certainly better than a lot of the low-cost options mentioned in this thread, it does suffer from a washed-out background and edge astigmatism, as compared to the other ES/68's I've owned. I'm going to look at the APM 30 this year myself. Most of my viewing is done with a N22T4, so the 30 mm range is not as important for me.

 

I haven't looked through one, but the ES 28/68 gets excellent reviews here.

My brother has the ES 68 28mm and likes it a lot. It's the eyepiece he replaced his 32mm Q70 and ES 68 24mm with. That how I got my ES 68 24mm he gave to me.


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#22 Distortion78

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Posted 10 April 2020 - 04:48 PM

Great info all, I am going to try the APM 30mm and Panoptic 24mm.

#23 James1996

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Posted 10 April 2020 - 05:10 PM

Good choices.



#24 MarkGregory

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Posted 11 April 2020 - 03:06 PM

So, you take all of these outside when you are observing? LOL 




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