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TMB-92L or AT111EDT

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#1 pga7602

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Posted 02 January 2013 - 10:19 PM

Can someone who has seen both please help me choose. Price is too close to decide with. I currently use a BORG 76ED refractor and an 127mm orion Mak.

Would the added 19mm of aperture from the Atro-Tech compensate for the lack of FL-53 glass of the TMB? I am purely using it for visual purposes and have no plans to ever do astrographic imaging.

#2 MikeBOKC

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Posted 03 January 2013 - 08:46 AM

Well I own the TMB92L and have looked through the AT111. They are both fine refractors. All else being equal (price, mount capacity, etc.) the extra aperture would decide for the AT.

#3 t.r.

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Posted 03 January 2013 - 09:13 AM

Do want want extreme portability? Get the 92L. Do want to see a lot more for your dollar than your current scope? Get the AT111. Will the 92L show more than your 76mm? You bet. Will the AT 111 show more still? You bet!!! For visual only forget about the FPL-53 in these sizes...aperture wins here easily. Good luck with your choice. ;)

#4 jrbarnett

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Posted 03 January 2013 - 11:10 AM

"...for visual purposes and have no plans to ever do astrographic imaging."

For these purposes I would (and did) opt for the AT111EDT.

Color correction is "good enough" even for picky visual observers (like me!), the more gentle f/7 focal ratio will allow successful use of a wider range of eyepiece designs, and you will be able to notice a 17% aperture difference at the eyepiece. The 111mm scope gathers 31% more light. The eye typically can detect a 10% brightness difference and will find a 20% brightness difference obvious.

However, unless you're shopping used, the AT scopes are on back-order and my understanding is that Astronomics is in the process of switching suppliers for their scopes, so it would be good to ask for an estimate as to when the new 111EDTs can be expected and whether there will be any price and/or specification changes.

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Good luck!

- Jim

#5 pga7602

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Posted 03 January 2013 - 12:46 PM

Thanks for making it easy guys. AT111EDT it is. I just got off the phone with Astronomics. I specifically asked if there was a supplier change, but he said no. The scope has gone through one change from the bigger tube to the current model. The same exact scope will be sold when they get more in, in a few months. This would give me time to find a nice CG5 for it. Thanks again everyone.

#6 jrbarnett

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Posted 09 January 2013 - 12:19 PM

Note that it should also render your 127mm Mak-Cass redundant and superfluous. The AT111EDT actually passes more light than the Mak, despite the smaller aperture due to the Mak's lower transmission and central obstruction. You'd probably need a 6-incher on the catadioptric front to see a noticeable improvement over the AT111EDT.

Regards,

Jim

#7 pga7602

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Posted 09 January 2013 - 03:33 PM

Exactly what I wanted to hear. Thanks !

#8 idealistic

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Posted 09 January 2013 - 04:48 PM

Theres a used William Optics FLT110 in the classifieds right now, it (edit: allegedly) uses the same optics. (in case youre impatient like me)

#9 pga7602

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Posted 10 January 2013 - 03:22 PM

How do you tell if it's the same optics? The F stops are different.

#10 dscarpa

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Posted 10 January 2013 - 03:56 PM

I thought my WO ZS-110 triplet had the same lens as the AT-111 but was told by Astronomics that's not the case. I highly recommend the WO objective. David

#11 idealistic

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Posted 10 January 2013 - 04:36 PM

I have no source other that multiple people on this forum repeating it many times. I was skeptical at first as well, but it seems to be common knowledge, although perhaps wrong as I initially suspected. :thinking:

#12 Astronomics

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Posted 10 January 2013 - 09:35 PM

Different optics. We have the lens prescription in house in my office drawer.

#13 RTLR 12

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Posted 10 January 2013 - 09:47 PM

I hope it's in the safe!

Stan

#14 jrbarnett

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Posted 11 January 2013 - 12:35 AM

Yeah, but how do you know that you're the *only* one with that lens prescription? Seems to me that you'd need the prescription for both lenses to say for sure that they're different. :thinking:

- Jim

#15 jrbarnett

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Posted 11 January 2013 - 01:46 PM

For the impatient sorts, here's a WO FLT-110 on A-Mart:

http://www.astromart...ified_id=806322

I think the price is nutters, given that when the new AT111EDTs arrive, they'll be priced less than this used WO scope, but...

Here's the lens shot (with the dust mentioned by the seller). See the deep green coatings?

http://www.astromart...ssifieds/806...

Now take a look see at the lens of my AT111EDT:

http://i95.photobuck...DT/P8021794.jpg

:thinking:

- Jim

#16 RTLR 12

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Posted 11 January 2013 - 02:14 PM

That scope has been listed here on CN for the last 10 days.

Stan






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