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Welcome to the ap-ug E-Mail Group
dawong@...
General discussions concerning Astro-Physics astronomical products--scopes and accessories.
Group Manager: ap-ug-owner@... To subscribe, send a message to ap-ug-subscribe@... or go to the e-group's home page at http://www.egroups.com/list/ap-ug
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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 ------------------------------------------------------------------------ eGroups.com home: http://www.egroups.com/group/ap-ug http://www.egroups.com - Simplifying group communications
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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 doubletThe 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 ------------------------------------------------------------------------ eGroups.com home: http://www.egroups.com/group/ap-ug http://www.egroups.com - Simplifying group communications
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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 ------------------------------------------------------------------------ eGroups.com home: http://www.egroups.com/group/ap-ug http://www.egroups.com - Simplifying group communications
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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$... Which brings up another question.. Will Roland now Raise the price of the Travelor??? Sean ------------------------------------------------------------------------ eGroups.com home: http://www.egroups.com/group/ap-ug http://www.egroups.com - Simplifying group communications
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Re: AP 90 EDL
Aposrus@...
In a message dated 7/2/99 9:56:55 AM Eastern Daylight Time, robhunt@...
writes: it was interesting to see al nagler very close by showing off his 85mm f7Were you able to compare them directly? Mike ------------------------------------------------------------------------ eGroups.com home: http://www.egroups.com/group/ap-ug http://www.egroups.com - Simplifying group communications
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Re: AP 90 EDL
Aposrus@...
In a message dated 7/2/99 11:23:40 AM Eastern Daylight Time,
CMUDUDE101@... writes: The price is 2400$... Which brings up another question.. Will Roland nowWell, it's got about 27% more light gathering area than the 92mm, but how that would really effect images, I don't know. -Rich ------------------------------------------------------------------------ eGroups.com home: http://www.egroups.com/group/ap-ug http://www.egroups.com - Simplifying group communications
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Re: AP 90 EDL
CMUDUDE101@...
Make that Traveler.... I hate posting to any group when i first wake up =)
Sean ------------------------------------------------------------------------ eGroups.com home: http://www.egroups.com/group/ap-ug http://www.egroups.com - Simplifying group communications
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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 middledifference to the end user as both types of glass can make equally colour free ------------------------------------------------------------------------ eGroups.com home: http://www.egroups.com/group/ap-ug http://www.egroups.com - Simplifying group communications
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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
eGroups.com home: http://www.egroups.com/group/ap-ug www.egroups.com - Simplifying group communications
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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 longerI 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 ------------------------------------------------------------------------ eGroups.com home: http://www.egroups.com/group/ap-ug http://www.egroups.com - Simplifying group communications
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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 ------------------------------------------------------------------------ eGroups.com home: http://www.egroups.com/group/ap-ug http://www.egroups.com - Simplifying group communications
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Re: AP 90 EDL
Rich N. <rnapo@...>
robhunt@...
writes: 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 ------------------------------------------------------------------------ eGroups.com home: http://www.egroups.com/group/ap-ug http://www.egroups.com - Simplifying group communications
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Re: AP 90 EDL
Rich N. <rnapo@...>
The price is 2400$... Which brings up another question.. Will Roland nowWell, it's got about 27% more light gathering area than the 92mm, but how Gee, I think it is pretty safe to guess the images would be a little brighter with a little better resolution. Rich ------------------------------------------------------------------------ eGroups.com home: http://www.egroups.com/group/ap-ug http://www.egroups.com - Simplifying group communications
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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
eGroups.com home: http://www.egroups.com/group/ap-ug www.egroups.com - Simplifying group communications
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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 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 ------------------------------------------------------------------------ eGroups.com home: http://www.egroups.com/group/ap-ug http://www.egroups.com - Simplifying group communications
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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 ------------------------------------------------------------------------ eGroups.com home: http://www.egroups.com/group/ap-ug http://www.egroups.com - Simplifying group communications
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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 beyondBut 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 ------------------------------------------------------------------------ eGroups.com home: http://www.egroups.com/group/ap-ug http://www.egroups.com - Simplifying group communications
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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 somethingAnother 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 ------------------------------------------------------------------------ eGroups.com home: http://www.egroups.com/group/ap-ug http://www.egroups.com - Simplifying group communications
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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 quitewhile 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 ------------------------------------------------------------------------ eGroups.com home: http://www.egroups.com/group/ap-ug http://www.egroups.com - Simplifying group communications
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