Do you believe in such a statement?

About BO's new 127mm F/8 achromatic refractor quality:

"I called BO on Monday 12:00 noon EST. Tammy answered and took a
message for Bill about my situation. Bill called me back 2 minutes
later and gave me a brief education on how the BO 1278 is made. I
enjoyed my call tremendously! Bill told me about my objective as he
had inspected and tested it himself. He told me that these objectives
are polished to 1/20th wave after the 3rd polish. That's how fine the
grit is that is used. Also that a good number of these objectives are
testing null, as well as approaching null! That explains the Star
test results with my Ronchi EP. Anyway in Bill's usual engaging
conversation he told me he had one other call that day about what
were thought to be scratches on the objectives. I can't say what the
out come of that call was. But mine I can and will."


1/20 wave? Yes? Did I understood you correctly?

Anybody else believe in such a statement?


V.D.

"ValeryD" wrote in message
om...
About BO's new 127mm F/8 achromatic refractor quality:

1/20 wave? Yes? Did I understood you correctly?

Anybody else believe in such a statement?


V.D.

Valery,
Good to have you back. How are the AP eyepieces coming along? 1/20th wave?
sounds like the marketing department doing the testing.

Regards,
Ed

He told me that these objectives
are polished to 1/20th wave after the 3rd polish.

Well

Given that a REFRACTING surface effects the wavefront roughly 1/4 as strongly
as a mirror surface.....this means that any given refracting surface that hase
1/20 th wavefront error is roughly that of a 1/5 wavefront error mirror in
terms of absolute surface accuracy requirements.....and given moderate,
spherical surfaces.....the claims may be slightly exaggerated but the are not
neccessarily "astronomical"

Blll

"ValeryD" wrote in message
om...
About BO's new 127mm F/8 achromatic refractor quality:

"I called BO on Monday 12:00 noon EST. Tammy answered and took a
message for Bill about my situation. Bill called me back 2 minutes
later and gave me a brief education on how the BO 1278 is made. I
enjoyed my call tremendously! Bill told me about my objective as he
had inspected and tested it himself. He told me that these objectives
are polished to 1/20th wave after the 3rd polish. That's how fine the
grit is that is used. Also that a good number of these objectives are
testing null, as well as approaching null! That explains the Star
test results with my Ronchi EP. Anyway in Bill's usual engaging
conversation he told me he had one other call that day about what
were thought to be scratches on the objectives. I can't say what the
out come of that call was. But mine I can and will."

1/20 wave? Yes? Did I understood you correctly?

Anybody else believe in such a statement?

V.D.

Greetings Valery,

I wonder if those values are determined with an interferometer or other test
method(s)?

In general, I think the properly conducted interferometer test results would
show lower values, but a bit more realistic values.

Dan McShane


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I wonder if those values are determined with an interferometer or other test
method(s)?

In general, I think the properly conducted interferometer test results would
show lower values, but a bit more realistic values.

Dan McShane


So here I am, waiting in line for one the Burgess Optical 102mm F6 scopes. Now
I am not expecting anything more than a decent achromat with a decent focuser
and finished a bit better than a Synta scope for my $200.

But there is talk of magic on that forum where Valery snagged that post. It
makes me uneasy, I don't want magic, just a decent scope.

Now, 1/20th lambda implies a surface precision at a single frequency. But
given that the objective in question is an achromart and about 127mm at about
F8, I wonder how much difference such precision would make since the design of
such an objective is quite a compromise????

In other words, ignoring the issue as to whether these really are 1/20th
lambda, is there anything to be gained by making an 127mm F8 achromart to 1/20
th Lambda???

jon

Hello, Valery,
It would help me to know who BO is. I take the credibility of the source
into account.
Thanks,
Bill Meyers

ValeryD wrote:

About BO's new 127mm F/8 achromatic refractor quality:

"I called BO on Monday 12:00 noon EST. Tammy answered and took a
message for Bill about my situation. Bill called me back 2 minutes
later and gave me a brief education on how the BO 1278 is made. I
enjoyed my call tremendously! Bill told me about my objective as he
had inspected and tested it himself. He told me that these objectives
are polished to 1/20th wave after the 3rd polish. That's how fine the
grit is that is used. Also that a good number of these objectives are
testing null, as well as approaching null! That explains the Star
test results with my Ronchi EP. Anyway in Bill's usual engaging
conversation he told me he had one other call that day about what
were thought to be scratches on the objectives. I can't say what the
out come of that call was. But mine I can and will."

1/20 wave? Yes? Did I understood you correctly?

Anybody else believe in such a statement?

V.D.

Hello, Valery,
It would help me to know who BO is. I take the credibility of the source
into account.
Thanks,
Bill Meyers

Burgess Optical.

http://knightcontrol.freeservers.com...e_127MM_F8.htm

The first 100 of these scopes were originally offered as OTAs plus finder plus
2 inch Diagonal and rings for about $300 with a $100 deposit. This was
sometime ago and they are now being delivered.

At the time, the first 100 of the 102 mm F6 scopes were offered for $199 with a
$100 deposit. As I was interested in the Synta 100mm F6 scope at the time,
this one seemed like a nicer scope, 2 speed focuser and all and hopefully it
will be. There have been some snags in production however so it seems that
delivery has been delayed once again.

There are Burgess Optical forums, Yahoo I believe, Herb even runs one.

Me, I am waiting for mine got plenty of other stuff to keep me occupied.

Jon

Good to have you back.

No it's not. I wish Valery the jerk
would stay off s.a.a. permanently.
The only time he ever posts here
is to attack another company.
Like:
Stellarvue
TMB
Burgess
APM
Zambuto

So who gets the "honor" of
being next?

Dr. Evil:

No it's not. I wish Valery the jerk
would stay off s.a.a. permanently.
The only time he ever posts here
is to attack another company.
Like:
Stellarvue
TMB
Burgess
APM
Zambuto

So who gets the "honor" of
being next?

At least Valery has enough guts to sign his name to his posts.....


Me too

Jon Isaacs

"Dan McShane" wrote in message
...
"ValeryD" wrote in message
om...
About BO's new 127mm F/8 achromatic refractor quality:

"I called BO on Monday 12:00 noon EST. Tammy answered and took a
message for Bill about my situation. Bill called me back 2 minutes
later and gave me a brief education on how the BO 1278 is made. I
enjoyed my call tremendously! Bill told me about my objective as he
had inspected and tested it himself. He told me that these objectives
are polished to 1/20th wave after the 3rd polish. That's how fine the
grit is that is used. Also that a good number of these objectives are
testing null, as well as approaching null! That explains the Star
test results with my Ronchi EP. Anyway in Bill's usual engaging
conversation he told me he had one other call that day about what
were thought to be scratches on the objectives. I can't say what the
out come of that call was. But mine I can and will."

1/20 wave? Yes? Did I understood you correctly?

Anybody else believe in such a statement?

V.D.

Greetings Valery,

I wonder if those values are determined with an interferometer or other
test
method(s)?

In general, I think the properly conducted interferometer test results
would
show lower values, but a bit more realistic values.

Dan McShane
Also, (critical one), whether these are peak, or RMS values. I have a scope
here, where the entire optical system, tested on a Zygo interferometer to
0.026 RMS (nudging towards 1/40th wave). However the peak error was nearer
1/7th wave.

Best Wishes