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AP 90 EDL

Derek Wong <dawong@...>
 

Hi everyone--our group is already over 30 members (including Roland and
Marj) in less than 24 hours!

I put myself on the "list" for a 90mm refractor, and I want to know a
few more specifics. It seems that people have started to receive these
scopes--they are saying that it is a 92mm f/5 doublet.

Is this true, what is the price, how big is the focuser, and can you use
this with an AP/Baader binoview without a barlow?

Thanks,

Derek Wong

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Re: AP 90 EDL

Blandp1@...
 

In a message dated 7/2/99 12:36:47 AM Eastern Daylight Time,
dawong@... writes:

they are saying that it is a 92mm f/5 doublet
The EDL is an oiled triplet. I've heard (unconfirmed) that the middle
element is not FPL53 but rather Fluorite - not that this makes any difference
to the end user as both types of glass can make equally colour free
telescopes.

-Philip J. Blanda III

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Re: AP 90 EDL

Rich N. <rnapo@...>
 

Hi Derek,

You can see a picture of the 90mm and quite a bit on
info on the C7 site....

http://www.company7.com/astrophy/refractors/ap90mm.html

Rich



Hi everyone--our group is already over 30 members (including Roland and
Marj) in less than 24 hours!

I put myself on the "list" for a 90mm refractor, and I want to know a
few more specifics. It seems that people have started to receive these
scopes--they are saying that it is a 92mm f/5 doublet.

Is this true, what is the price, how big is the focuser, and can you use
this with an AP/Baader binoview without a barlow?

Thanks,

Derek Wong

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Re: AP 90 EDL

CMUDUDE101@...
 

In a message dated 7/2/99 9:56:47 AM Eastern Daylight Time, robhunt@...
writes:

<< Is this true, what is the price, how big is the focuser, and can you use
this with an AP/Baader binoview without a barlow?
>>
The price is 2400$... Which brings up another question.. Will Roland now
Raise the price of the Travelor???

Sean

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Re: AP 90 EDL

Aposrus@...
 

In a message dated 7/2/99 9:56:55 AM Eastern Daylight Time, robhunt@...
writes:

it was interesting to see al nagler very close by showing off his 85mm f7
doublet. i think if i had been him i might have chosen a spot a little
further away.
Were you able to compare them directly?
Mike

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Re: AP 90 EDL

Aposrus@...
 

In a message dated 7/2/99 11:23:40 AM Eastern Daylight Time,
CMUDUDE101@... writes:

The price is 2400$... Which brings up another question.. Will Roland now
Raise the price of the Travelor???
Well, it's got about 27% more light gathering area than the 92mm, but how
that would really effect images, I don't know.
-Rich

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Re: AP 90 EDL

CMUDUDE101@...
 

Make that Traveler.... I hate posting to any group when i first wake up =)

Sean

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Re: AP 90 EDL

Rich N. <rnapo@...>
 

Wouldn't you have to make the f-ratio a little longer
when using FPL-53 to achieve the same level of
color correction?

Rich

The EDL is an oiled triplet. I've heard (unconfirmed) that the middle
element is not FPL53 but rather Fluorite - not that this makes any
difference
to the end user as both types of glass can make equally colour free
telescopes.

-Philip J. Blanda III

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Re: AP 90 EDL

Rob Hunt <robhunt@...>
 

    i saw the french's 90mm in action last summer at stellafane.  it is like a jewel -  an oil spaced triplet with a 2" focuser (not 2.7"). she had it turned on the summer milky way in the south and the views were quite impressive.  i remember her saying at the time it was one of two but many more have been produced since i gather.  it was interesting to see al nagler very close by showing off his 85mm f7 doublet.  i think if i had been him i might have chosen a spot a little further away.  i am COUNTING on another look this year so i hope you are listening sue french.  i would love to see how it performs at 200x.
 
robert hunt
----- Original Message -----
From: Derek Wong
Sent: Friday, July 02, 1999 12:02 AM
Subject: [ap-ug] AP 90 EDL

Hi everyone--our group is already over 30 members (including Roland and
Marj) in less than 24 hours!

I put myself on the "list" for a 90mm refractor, and I want to know a
few more specifics.  It seems that people have started to receive these
scopes--they are saying that it is a 92mm f/5 doublet.

Is this true, what is the price, how big is the focuser, and can you use
this with an AP/Baader binoview without a barlow?

Thanks,

Derek Wong

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Re: AP 90 EDL

Blandp1@...
 

In a message dated 7/2/99 8:36:15 AM Eastern Daylight Time, rnapo@...
writes:

Wouldn't you have to make the f-ratio a little longer
when using FPL-53 to achieve the same level of
color correction?
I can assure everyone on the list that I have no idea! But that's never
stopped me from guessing :-). My guess is that given that the V number of
Fluorite and FPL53 is virtually identical (~95) that either material could be
used to make a short F.R. 92mm refractor.

I know that some early Travelers were made with FPL52 glass and had identical
colour correction to the later ones made with FPL53, the difference between
the two types is that the FPL52 Travelers needed steeper curves than the
FPL53 Travelers.

I hope those that do in fact know will correct me if I am wrong.

-Philip J. Blanda III

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Re: 90mm

Todd Gross <toddg@...>
 

In terms of the Stowaway.. is it 92mm or 90mm. At 2400, yes, I believe an
increase in the Traveler price is forthcoming, but only time will tell. I
do like the 85mm Televue very much and would appreciate a comparison if
anyone can do it. I also have a traveler

Todd



thanks!
-Todd

Boston Meteorologist Todd Gross
toddg@...
http://www.weatherman.com
(617)725-0777



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Re: AP 90 EDL

Rich N. <rnapo@...>
 

robhunt@...
writes:

<< Is this true, what is the price, how big is the focuser, and can you use
this with an AP/Baader binoview without a barlow?
>>
The price is 2400$... Which brings up another question.. Will Roland now
Raise the price of the Travelor???

Sean

If you read Roland's comments posted on the C7 site about the 90mm
I wouldn't think you could predict that the Traveler will have it's price
raised
based on the price of the new 90. Why? Because the unit cost of the 90
was quite high for its size.

Rich




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Re: AP 90 EDL

Rich N. <rnapo@...>
 


The price is 2400$... Which brings up another question.. Will Roland now
Raise the price of the Travelor???
Well, it's got about 27% more light gathering area than the 92mm, but how
that would really effect images, I don't know.
-Rich

Gee, I think it is pretty safe to guess the images would be a little
brighter
with a little better resolution.

Rich


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Re: AP 90 EDL

Rob Hunt <robhunt@...>
 

    at stellafane the TV-85 was saddled with a binoviewer (not my favorite.)  i don't remember what eps he was using but it was certainly under 50x and the views were excellent as you might expect.  the 90mm edl was running at even lower power (maybe 25x) and at these levels the two tubes should be virtually indistinguishable (of course the edl can go a little wider).  at other times i have seen 85s used at higher powers and they were quite good up to about 130x.  beyond that it starts to display a little color while its lack of descent baffling betrays itself with quite a bit of flare.  i don't think of it as a planetary scope nor do i consider it a true apo.  the 90mm on the other hand should be color free at any useful power and should be able to handle over 200x without breaking a sweat but i have yet to see this for myself. 
 
robert hunt
----- Original Message -----
Sent: Friday, July 02, 1999 11:47 AM
Subject: [ap-ug] Re: AP 90 EDL

In a message dated 7/2/99 9:56:55 AM Eastern Daylight Time, robhunt@...
writes:

>  it was interesting to see al nagler very close by showing off his 85mm f7
> doublet.  i think if i had been him i might have chosen a spot a little
> further away.

Were you able to compare them directly?
Mike

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OT: Ads

Blandp1@...
 

In a message dated 7/2/99 5:56:20 PM Eastern Daylight Time, rnapo@...
writes:

the ads at the
bottom are very annoying.

Ads are being added by the mailing list software. I wonder if there is a way
the listowner can turn it off?

-Philip J. Blanda III

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Cool alt-az mount for 155EDF

Blandp1@...
 

I met Robert Hunt a few weeks ago at the NJ StarQuest star party. Had a fun
night but for now I'd like to invite Rob to tell the group about the
fantastic custom made alt-az mount he had his 155EDF on. It was really great
using it, so much so that I'm seriously thinking about an alt-az mount myself.

-Philip J. Blanda III

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Re: AP 90 EDL

Aposrus@...
 

In a message dated 7/2/99 5:13:49 PM Eastern Daylight Time, rnapo@...
writes:

I certainly appreciate all of Roland's work since it is far beyond
my ability to make anything close to what AP makes. However,
my primary interest is in the best image quality even if it means
makeing a telescope a few inches longer.
But is there an image quality difference between say the 130 F6 and F8.3
scopes? If not, keeping the faster aperture might be the more versatile
choice.
Mike

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Re: AP 90 EDL

Aposrus@...
 

In a message dated 7/2/99 5:37:55 PM Eastern Daylight Time, toddg@...
writes:

The FSQ106 is something
like 14.6 lbs which is quite hefty. I find the Traveler is suitable on
Telepod, but I would really want anything much heavier.
Another issue, maybe not too important is the look of the scope. I find the
Traveler
to be "easier" to look at than the tank-like Tak FSQ106. I guess the big
focuser is what makes the Tak look quite different from other small apos.
Mike

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Re: AP 90 EDL

Aposrus@...
 

In a message dated 7/2/99 1:58:58 PM Eastern Daylight Time, robhunt@...
writes:

at other times i have seen 85s used at higher powers and they were quite
good up to about 130x. beyond that it starts to display a little color
while
its lack of descent baffling betrays itself with quite a bit of flare.
The colour on the TV85 is quite low, not really worth worrying about but
two i've seen have had some diffused light (maybe a bit too much) when
looking at Jupiter. I saw less diffused light in an ETX nearby. However,
the image was much brighter in the TV85 than the ETX so it's possible
the diffusion was not proportional, in other words the total percentage
of light being diffused in the TV85 may have been less than the ETX.
Mike

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