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What is a TMB? A little History.

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#1 Thomas Back

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Posted 24 September 2006 - 08:38 PM

I have been a lens designer for over 17 years, and have worked on lenses,
eyepieces and many other optical components, for professional applications,
amateur astronomers, and other optical companies that market telescopes,
eyepieces, accessories. Not to mention design work for the ATM (amateur
telescope maker).

There is a lot of confusion about what telescope has a TMB designed lens,
or not, and what element types are used.

What is a TMB?

Here is an up to date and total accurate list of lenses that I, Thomas M.
Back
has designed, and some information about them. I can't possibly list every
lens in the last 17 years that I designed for commercial use, but I will list
the current lenses that are being sold today, or in the not too distant past.

TMB/APM

80mm f/6 and f/7.5 fluorite triplet apochromats (only when
it was a fluorite triplet, later, LOMO stopped using fluorite,
and went to OK-4 SD glass, and used their own design).

All lenses below are made by LZOS, in Russia:

95mm f/6.8 triplet SD apochromat (not for sale yet)
100mm f/8 triplet SD apochromat
105mm f/6.2 triplet SD apochromat
115mm f/7 triplet SD apochromat
130mm f/6 triplet SD apochromat
130mm f/9.25 triplet SD apochromat
152mm f/7.9 triplet SD apochromat
175mm f/8 triplet SD apochromat
180mm f/9 lowest Abbe ED glass/short flint triplet apochromat
180mm f/7 triplet SD apochromat (not for sale yet)
203mm f/7 triplet SD apochromat
203mm f/9 triplet SD apochromat
9" f/9 triplet SD apochromat
9" f/7 triplet SD apochromat (not for sale yet)
10" f/9 triplet SD apochromat
12" f/7.5 triplet SD apochromat (custom project)
12" f/10 triplet SD apochromat
12" f/12 triplet SD apochromat
14" f/12 triplet short flint nulled spherochromatism apochromat
21" f/12 triplet short flint nulled spherochromatism apochromat

Field flatteners, and eyepieces, made by Zeiss subcontractors

Stellarvue

Various triplet SD apochromats, now replaced with new models

William Optics

80mm f/6.9 fluorite doublet apochromat
80mm f/6 Megrez OK-4 triplet SD apochromat
110mm f/7 ED FPL-51 doublet apochromat
110mm f/7 ED FPL-51 triplet apochromat
132mm f/7 ED FPL-51 triplet apochromat

The 132mm f/7 ED triplet apochromat has been
mistakenly quoted as a FPL-53 triplet objective,
when in fact, it is a FPL-51 triplet apochromat.
The TMB/WO 132mm f/7 FPL-51 triplet apochromat
is an excellent design, however, it is not as good as
a FPL-53 triplet would be, using the same glasses.

Burgess Optical

80mm f/11.25 "Planetary Hunter" Semi-Apo with nulled
spherochromatism

92mm f/7 "Brick" Apochromat with nulled sphero-
chromatism

Various lenses, doublet, triplet and quad, that are
not in production.

All lenses listed are true TMB designs, and are not "scaled"
designs by another optical designer. If there is a TMB lens
not listed, or says it uses different glasses, it is not a TMB
designed lens.

I hope this clarifies any misunderstanding about what a real
TMB lens is, and has indeed been designed by TMB.

Sincerely,

Thomas M. Back
TMB Optical
 

#2 Moravianus

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Posted 24 September 2006 - 09:03 PM

Thomas,

nice to see that you recuperated enough to post. Also, glad to see what my scope has in its design.

Maybe you should also clarify, what "TMB-codesigned" (used by WO) means..
 

#3 blandp11

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Posted 24 September 2006 - 09:08 PM

Thomas,

Happy to see that you are feeling well enough to post, hopefully that healing trend will accelerate!

All the best,

Philip
 

#4 Chris G

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Posted 24 September 2006 - 09:29 PM

Best wishes for a complete and speedy recovery.
 

#5 msholden

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Posted 24 September 2006 - 09:31 PM

Hi Thomas

Great to see a post from you. I hope this means you're starting to feel healthier again.

You seem to have left off the Signature Series objectives.
 

#6 Thomas Back

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Posted 24 September 2006 - 09:50 PM

> Thomas,
>
> nice to see that you recuperated enough to post.

I wish it were so. But, I want to thank all the kind and caring people that have prayed, sent get-well cards, and e-mails, all wishing for my health to get better. You have no idea how touched I am for all your kindness. There is still a very long road ahead for me, and doing e-mails and especially taking phone calls is very difficult, as I am very weak. Building telescopes at this time is out of the question. Thanks to everyone for your understanding.

> Also, I glad to see what my scope has in its design.

I'm happy you feel that way.

> Maybe you should also clarify, what "TMB-codesigned"
> (used by WO) means..

I would like to know myself.

Take care,

Thomas Back
TMB Optical
 

#7 Thomas Back

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Posted 24 September 2006 - 10:10 PM

> Hi Thomas
>
> You seem to have left off the Signature Series objectives

Good point, but because of the very competitive nature of
today's apo marketplace, I can't mention the maker of my
new TMB Signature Series apo objectives.

But I sure can tell everyone what is planned for production.
More sizes are very possible, but I will only list the lens
that will be in production for sure, and one prototype,
that is planned for production.

TMB

130mm f/7 FPL-53 triplet SD apochromat
155mm f/7.5 FPL-53 triplet SD apochromat (prototype)

Thanks for your interest.

Thomas
 

#8 rszabo

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Posted 24 September 2006 - 11:15 PM

Thomas,

We're all glad to see you are strong enough to be posting...that's great news. Don't over-exert yourself. We want you to recover fully, and we can wait as long as it takes.

That's interesting about the 110 you designed for WO. They have stated here on this site that it is indeed FPL-53, not 51. In fact, I was told that when I purchased it. I don't care if it's made with plexiglass as long as the views are good, but I wonder why the conflicting info.

In any case, best wishes from the Szabos to you!!

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#9 Joe Cipriano

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Posted 24 September 2006 - 11:19 PM

Thomas:

Godspeed. Hope the road is smooth, with no potholes or roadblocks. Post as you're able, even if it's just "Hi - I'm doing OK".
 

#10 JerryWise

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Posted 24 September 2006 - 11:23 PM

Same here Thomas. Your work is greatly respected. A lot of us are pulling for you in many ways. Take care.
 

#11 badsnoopy

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Posted 24 September 2006 - 11:32 PM

Thanks for clearing that up about your designs. Rest and get well. Nothing is more important than your health.
 

#12 Don W

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Posted 25 September 2006 - 09:59 AM

I am locking this thread at Thomas Back's request. He is quite ill and cannot engage in a discussion at this time. He wanted to get this information out to the public in order to clear up some misconceptions about TMB optics.

Don Wyman
Moderator
 


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