Ultra Flat Field eyepieces

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Chopin
Post subject: Re: Ultra Flat Field eyepieces
Posted: Mon May 08, 2017 8:27 am
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Yup. Been rain, rain, rain in the general area (mine and Mark's being regionally similar). Making up for two previous drought-like springs.

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Mark
Post subject: Re: Ultra Flat Field eyepieces
Posted: Mon May 08, 2017 12:41 pm
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Yes indeed Jason, you are correct !!!!

The rain FINALLY subsided, now waiting for clear skies and warmer temps / no moon!

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Chopin
Post subject: Re: Ultra Flat Field eyepieces
Posted: Mon May 08, 2017 1:48 pm
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Patience will pay off. I'm guessing you are pretty eager to get out there.

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Erik
Post subject: Re: Ultra Flat Field eyepieces
Posted: Wed May 10, 2017 3:31 pm
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Same here- we got a bunch of rain which meant it took me forever to finish the review of the ESc92 degree ep's. Finally got some clear skies last week and got several consecutive nights of observing bliss.

Hope it clears up for you guys.

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Mark
Post subject: Re: Ultra Flat Field eyepieces
Posted: Thu May 11, 2017 3:21 pm
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You got that right. LMAO!

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Mark
Post subject: Re: Ultra Flat Field eyepieces
Posted: Tue May 16, 2017 6:09 am
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Report #2 finished! (With the added bonus of Jupiter at 178x and 250x with two more Tele Vue Delites!)

Shootout. 18.2mm Tele Vue delite Vs. 18mm APM 65 degree.

Scope used: (Only one in the field last night), 10" F/5 Orion Dob Classic, no coma corrector. Seeing was pretty good. Was able to see some nice detail on Jupiter using 7mm and 5mm Delites. I really like those eyepieces, and was very impressed. The 62 degrees does not feel restricted at all IMO.

OK, onto the shootout, (which was brief because there wasn't a whole lot of time and we could see clouds rolling in and there wasn't a whole lot of open clusters available, so it was kinda rushed a little).

Looked at M-44 and M-67 and the field around m-104.

Up first: 18.2mm Delite.

Very comfortable even with the eye-cup rolled down, the view was super easy to take in. Stars were lively looking. Nice transmission. Correction without a CC was incredibly good. Only very very minor coma seen near the edges. You know how when you tilt your head with some eyepieces that flaring can start, etc? Well, I tried tilting my head and there was no weird effects going on. Still very sharp. Even thought this EP is slated at 62 degrees, it just feels wider for some reason. Very impressed. I WANT ONE!

Up second: 18mm APM Ultra Flat Field, (65 degrees).

Comfortable with the eye-cup rolled down, but my observing friend and myself agreed that having the rubber eye-cup in the up position aided in keeping the eye position optimal. With it rolled down blackouts can happen if not positioned just right. Nice transmission as well. Correction was not as good as the 18mm Delite, but not distracting IMO. A coma corrector would prob clean this right up. When I tilted my head, stars kinda went funky unlike in the 18.2mm Delite. Immersion in the eyepiece, (slated at 65 degrees), did not feel wider than the 18.2mm Delite, but it was wider in true field as I could see it when comparing because there were a bit more field stars seen. I'd really like to try this EP in a long focus refractor soon. Two of my observing friends have them, so I will be checking that out soon, along with an 11" SCT, and other scopes in the field when we ALL go there one night.

In the fast 10" F/5 reflector, I'd have to say that the 18.2mm Delite was better than the 18mm APM UFF in more than one account, and I will be picking up the 18.2mm Delite and selling off my 18mm APM down the road.

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Mark
Post subject: Re: Ultra Flat Field eyepieces
Posted: Tue May 16, 2017 6:10 am
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Erik wrote:
Same here- we got a bunch of rain which meant it took me forever to finish the review of the ESc92 degree ep's. Finally got some clear skies last week and got several consecutive nights of observing bliss.

Hope it clears up for you guys.
Thanks Erik!

I'm looking forward to that review!

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Chopin
Post subject: Re: Ultra Flat Field eyepieces
Posted: Tue May 16, 2017 5:15 pm
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That was a highly useful review, Mark, thank you! My gut keeps pulling me to those DeLites. You pretty much summed up exactly why.

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Mark
Post subject: Re: Ultra Flat Field eyepieces
Posted: Wed May 17, 2017 9:47 pm
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No problems Jason!

Your gut is right!

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Don Pensack
Post subject: Re: Ultra Flat Field eyepieces
Posted: Tue May 25, 2021 1:22 pm
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Just a note to say that these KUO UltraFlat Field eyepieces are now sold under the
APM UltraFlatField
Altair UltraFlat
Meade UHD
Celestron Ultima Edge
Tecnosky Ultra Flat (only the 30mm)
and Orion UltraFlat (all but the 30mm)
labels.
They're all good, but the 30mm is special--world class, IMO.

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Chopin
Post subject: Re: Ultra Flat Field eyepieces
Posted: Sat May 29, 2021 11:15 am
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Thanks for the update, Don. Also, great to hear from you.

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Erik
Post subject: Re: Ultra Flat Field eyepieces
Posted: Mon Jul 05, 2021 12:48 am
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Great info, Don. And yes, nice to hear from you, it’s been a long time.

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Homebuilt 16" Truss Dob
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SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


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Evolution is both fact and theory. Creationism is neither. -Anonymous


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