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Visual color correction np101 vs TEC 140?

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#1 Pezdragon

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Posted 12 August 2013 - 11:36 AM

I have the np101 and consider it to have great color correction for my
strictly visual use. I am craving a little more aperture and really like all
that I've read about the TEC 140. Has anyone done a side by side comparison of the two addressing said correction?
I know the TOA 130 perhaps may be better but for visual only and other reasons the TEC really appeals to me. Thanks for any thoughts, Rod

#2 John Anthony

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Posted 12 August 2013 - 08:28 PM

I owned the TEC 140 and it really is an awesome scope, I am strictly a visual observer and I can't imagine any other scope at 140 mm offering you anything that the TEC 140 will not. I can't comment on photography application as I have zero experience in that area. I have had my fair share of looks thru other high end apo's and the TEC 140 is the equal if not better in some ways than the rest, AP, Televue, TAK, Stellarvue, all included.

#3 John Anthony

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Posted 12 August 2013 - 10:26 PM

my TEC 140, I do miss it.

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#4 Rick M.

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Posted 12 August 2013 - 11:10 PM

Given that you like the NP-101, have you thought about the NP-127?

#5 Pezdragon

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Posted 12 August 2013 - 11:34 PM

I'm looking for a longer f.l. at this point.I will hang onto the NP101 for really wide field, but like double stars and planetary. I have a 10" f8 dob but rare is the night here in the San Francisco Bay Area that the seeing will let it shine. The TEC just seems to be a great combination of size and capability

I am just curious as to the color correction on mag 3 or brighter stars as seen visually at around 300 -400x as I find myself using for double stars.
The NP does quite well at that range.

#6 Kunama

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Posted 13 August 2013 - 01:41 AM

There was a thread recently about the TEC140 and its colour correction.

#7 gillmj24

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Posted 13 August 2013 - 06:22 AM

Both scopes are tops in its class when it comes to color correction.

#8 Jon Isaacs

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Posted 13 August 2013 - 06:53 AM

There was a thread recently about the TEC140 and its colour correction.


I think this is the thread:

Purple haze around Sirius with a TEC? (140)

For what it's worth, I see no purple haze in my NP-101 on any target.

Jon

#9 ManuelJ

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Posted 13 August 2013 - 07:46 AM

There was a thread recently about the TEC140 and its colour correction.


I think this is the thread:

Purple haze around Sirius with a TEC? (140)

For what it's worth, I see no purple haze in my NP-101 on any target.

Jon


I have a NP127 and I see a purple haze on planets and bright stars. And the color in intra/extra is obvious.

Can't compare both telescopes, but I would bet for a similar color correction.

#10 Mike Holland

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Posted 13 August 2013 - 04:47 PM

There was a thread recently about the TEC140 and its colour correction.


I think this is the thread:

Purple haze around Sirius with a TEC? (140)

For what it's worth, I see no purple haze in my NP-101 on any target.

Jon


I have a NP127 and I see a purple haze on planets and bright stars. And the color in intra/extra is obvious.

Can't compare both telescopes, but I would bet for a similar color correction.


Which eyepieces are you using? I've used an NP-101 for well over a hundred viewing sessions over the past seven years, and I've never seen purple fringing on anything. My understanding is that the NP-127 has very similar optics (design and materials).

Mike

#11 Mike Clemens

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Posted 13 August 2013 - 04:52 PM

As I recall, TEC optimized the 140 to have the best strehl across the visual spectrum. (For people from our star system : )

TEC140 jupiter images:
http://www.astronomy...eid=6212&amp...

TEC140 M31:
http://outters.fr/im...6-prof-sRGB.jpg

I would jump at a TEC140 in a heartbeat... (I own a bigger TEC ED scope right now.)

#12 Jon Isaacs

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Posted 13 August 2013 - 08:09 PM

I have a NP127 and I see a purple haze on planets and bright stars. And the color in intra/extra is obvious.

Can't compare both telescopes, but I would bet for a similar color correction.



I have never seen any false color around bright stars, even on Venus with my NP-101. I have only owned it for three years but I am quite sure I have observed with it in the neighborhood of 300 nights.

John Rhodes said that the old 127's did not use the same glasses and the NP-101 so I guess that would account for the differences in color correction.

Jon

#13 Pezdragon

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Posted 13 August 2013 - 08:35 PM

My experience agrees with Jon as I have never seen any false color around very bright stars with the NP101. And that also goes for deep lunar shadows. Seeing purple shadows on craters would be at least somewhat distracting. I'm hoping a TEC 140 would not display that, Rod

#14 maknewtnut

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Posted 13 August 2013 - 11:56 PM

Both scopes are tops in its class when it comes to color correction.


I tend to disagree (unless 'class' might be more specific than I'm interpreting it). Both are very good in this regard, but not tops in their respective classes. I think you'll find the level of CA in the TEC relatively comparable to the TV, despite it's larger aperture.

#15 blueman

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Posted 14 August 2013 - 12:41 AM

I have both scopes and neither display any thing that I ever worry about.
Blueman

#16 Psion

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Posted 14 August 2013 - 01:34 AM

I have TEC140 a few years and I'm very happy from it. CA is visible only on extreme lights object (Venus) but on the planet and Moon nothing. If a object has low altitude above horizon you can see false a blue or violet color because of a refraction not from a lens. Advantage the TEC 140 is not great CA correction, but great contrast because of oil triplet (there is only two optic surface).

We compared a lot of telescopes in one night on the astronomy meeting and TEC has a best detail on the Jupiter from a many reflectors (including SCT) and refractors and reached a same quality like TMB 130/780.

#17 la200o

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Posted 14 August 2013 - 11:35 AM

I detect no color in my NP101. It may be equalled, but not surpassed in its class.

I'd sure love to have a TEC 140, though. . .

Bill

#18 RAKing

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Posted 14 August 2013 - 02:54 PM

I have the np101 and consider it to have great color correction for my
strictly visual use. I am craving a little more aperture and really like all
that I've read about the TEC 140. Has anyone done a side by side comparison of the two addressing said correction?
I know the TOA 130 perhaps may be better but for visual only and other reasons the TEC really appeals to me. Thanks for any thoughts, Rod


Couple of quick thoughts: My TOA 130 was no better than my TEC 140 for color correction. I still had the TOA and an FS-128 when I received my TEC and was able to enjoy all three for a week or two before the spouse told me to clear out some space. :)

I've never done a side-by-side with an NP-101, but I have looked through a few of them and I couldn't see any 'bad' color or haze through any of them. The brighter image of the 140 will blow the little four inch away and I think you will like the TEC 140 as much as I like mine.

Cheers,

Ron

#19 Pezdragon

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Posted 09 September 2013 - 07:13 PM

Thanks everybody for the replies to my question. I took the leap and sent off my deposit for a TEC 140 !
Sooo.....7-8 months from now...Woohoo, Rod

#20 Ennis

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Posted 09 September 2013 - 10:09 PM

Thanks everybody for the replies to my question. I took the leap and sent off my deposit for a TEC 140 !
Sooo.....7-8 months from now...Woohoo, Rod


Did Yuri tell you the wait would be 7-8 months? If so, you lucked out.

Ennis

#21 mark8888

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Posted 09 September 2013 - 10:21 PM

My experience agrees with Jon as I have never seen any false color around very bright stars with the NP101. And that also goes for deep lunar shadows. Seeing purple shadows on craters would be at least somewhat distracting. I'm hoping a TEC 140 would not display that, Rod


I used a TEC 140 basically every clear night for a year, including on the moon at every stage. No purple shadows whatsoever. Congrats on the amazing scope. :grin:

#22 Pezdragon

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Posted 09 September 2013 - 10:39 PM

Yuri did mention 7-8 months as of 2 days ago.

#23 Fomalhaut

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Posted 10 September 2013 - 07:44 AM

Color-blindness varies from individual to individual...

Chris

#24 mark8888

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Posted 10 September 2013 - 08:48 AM

Color-blindness varies from individual to individual...

Chris


I'm sorry to hear that. I hope you get an appointment to get checked out as soon as possible then, and good luck! Cheers :grin:

#25 Fomalhaut

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Posted 10 September 2013 - 11:49 AM

Suffering from color-blindness:rainbow:would be cheaper. Almost unfortunately, I'm on the healthy but expensive side :shrug:
Chris






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