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Manufactures of good long focaL length refractors

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#1 Bart

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Posted 30 January 2013 - 04:51 PM

Are there any makers of decent long focal ratio refractors left? If so, who? What would you suggest?

Thank
Bart

#2 Mirzam

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Posted 30 January 2013 - 05:08 PM

Surely you have heard of this:

D&G

I have a 5" f/12 and it's quite excellent. Took over a year to arrive though.

JimC

#3 starman876

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Posted 30 January 2013 - 05:13 PM

I have even seen a 5" F12 triplet

http://www.cloudynig...ct=73444&sor...

then there is ISTAR who makes long focus achromats.

Trying searching on Google. You would be amazed what you can find :foreheadslap:

#4 terraclarke

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Posted 30 January 2013 - 05:15 PM

These are definitely beauties. The maker is a member of the refractors forum. You can check the buzz on them over there.

http://skylight.myshopify.com/

#5 Bart

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Posted 30 January 2013 - 06:21 PM

Very nice. But, all are out of my price range. I forgot to include "reasonably priced" in my question....

#6 starman876

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Posted 30 January 2013 - 06:47 PM

You buy a reasonably priced telescope you get optics that are reasonably good.

I suggest you try the Surplus Shed and buy a Jeagers 4" F15 lens for $100 and then get some tubing and focuser and get crafty. Otherwise, you will just have to go without.

Sorry, but it is the sad truth. Well, unless you get lucky on Craiglsist and find a great deal.

#7 turk123

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Posted 30 January 2013 - 09:00 PM

I got to know Richard 2 years ago at Neaf. He brought two refractors with him. He sold one, took orders, and had to move the other before he went back to England. I could kick myself now. I think he finally got $695. :foreheadslap:

#8 mikey cee

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Posted 30 January 2013 - 10:25 PM

ISTAR ISTAR ISTAR ISTAR ISTAR ISTAR ISTAR ISTAR ISTAR You can have any stock or custom made lens placed into an OTA then you can tour the solar system and beyond in style! :grin: Mike

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#9 terraclarke

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Posted 30 January 2013 - 10:57 PM

Johann, I just bought one of the remaining Jaegers 4 inch f15 lenses two weeks ago. It got a premium and not a second and it was priced at 150 bucks, but with the sale of 30 percent off I did get it for ~100. Thet were going fast though and I just checked the Shed a few minutes ago and no more 4 inches were for sale, not even seconds.

Terra

#10 ryanr256

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Posted 30 January 2013 - 11:16 PM

Johann, this is 2013, the piece has gone up. I just bought one of the remaining Jaegers 4 inch f15 lenses two weeks ago. It was a premium and not a second and it was 150 bucks, sale price with 30 percent off. Regular price is ~225 and they are going fast.

Terra


That's interesing Terra. I ordered the 103mm Jaegers objective, SKU L10607J, from Surplus Shed on Friday 1/25. My price was $149 and I had a code for 30% off.

I look now and that SKU is unavailable. I've not received any notification of it not being available, but I've also not received a shipping notification.

My goal is to make my own F/15 refractor.

-Bob

#11 bremms

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Posted 31 January 2013 - 12:19 AM

The 103mm F15's seem to be very good as a lot, never heard any complaints and I have two good ones. I did have trouble witha couple of 82mm lenses. Fred did exchange them.

#12 Bart

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Posted 31 January 2013 - 09:37 AM

I'm a total newb in the world of DIY long F/ refractors. Is there a 101 website that you'd recommend to someone that want's to build their own? Are good lenses no longer available? Where does one get a good lens? Sorry for my simple questions.....

#13 terraclarke

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Posted 31 January 2013 - 09:56 AM

You can find lots of good information in the Refractors forum and also the DIY/ATM forum. Be forewarned though, a lot of the folks over in Refractors are into modern short focal length ed apos, but there are some of us long tube achro freaks there too.

Terra

#14 Bart

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Posted 31 January 2013 - 10:03 AM

I have a short focal length scope and I've very happy with it. I'm simply at the point of wanting to have a long focal length achromat to see what that's like. And if I can make one for relatively little money, so much the better.

#15 Mirzam

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Posted 31 January 2013 - 03:22 PM

If you purchase a lens-in-cell (e.g. I-Star, D&G, or sometimes Surplus Shed) then you mainly need a focuser. These are nice:

Crawford Machine

Then if you can build a long, square box, or get a piece of metal tubing that fits the focuser and lens cell, you are set to go. (Still need a huge mount of course).

Do some searches in the ATM forum and you will find a lot of options.

JimC

#16 starman876

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Posted 31 January 2013 - 05:01 PM

if you want cheap

here you go

found through google

http://handsonoptics...th=14_15&amp...

#17 starman876

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Posted 31 January 2013 - 05:05 PM

and here once again found through google

http://www.antaresop.../vixen-spec.htm

I think you can handle it from here.

also we are going to get slammed soon for being out of context for not talking about classic telescopes.

#18 neotesla

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Posted 31 January 2013 - 07:44 PM

The f10 and f13 Antares are discontinued. The f15 was well discussed on CN at one time as well, and those have been unavailable for even longer.

#19 starman876

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Posted 31 January 2013 - 08:24 PM

darn

#20 bremms

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Posted 31 January 2013 - 08:49 PM

Not too many choices. The 103mm SS lenses seem to be gone now. Still some 82mm F15's left, the replacement 83 that Fred sent is really superb. Finally got a good 45 minutes of nice clear sky a little while ago. The 103mm F15 Jaegers is really good. GRS was clearly visible along with lots of festoons.

#21 starman876

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Posted 31 January 2013 - 08:58 PM

I remember that Hands on Optics were selling some Vixen Spec lenses

#22 starman876

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Posted 31 January 2013 - 09:13 PM

http://www.khanscope...?productID=1969

looks like antares is still available outside the USA

#23 Joe Cepleur

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Posted 31 January 2013 - 11:27 PM

we are going to get slammed soon for being out of context for not talking about classic telescopes.



Maybe not. You're lamenting the lack of new scopes built to classic standards, and trying to find a solution. The fact is that not everyone can find or afford a 4" Unitron, but many of us aspire at least to the optically equivalent experience.

Long-focus scopes are way under-appreciated. Their views are prettier at lower cost, they hold focus better in compromised air, and they are happy with simple, inexpensive eyepieces. If you can find a modern solution to the problem of the world's limited supply of classics, more power to you. "Classic" as a set of optics and a state of mind is valuable in itself, even if the scope is new and the label won't read "Nippon Kogaku."

Cost is a legitimate concern. Skylight Telescopes are perfect, but beyond many budgets. S&T published a glowing review of that scope from Hands-On Optics, emphasizing that the price was not a misprint.

This is, incidentally, why I jumped at the chance to buy my Tasco 7TE-5 recently. I understand that 60mm of aperture won't show me everything I could possibly want to see, yet I anticipate that what it reveals will be shown with exquisite beauty.

#24 neotesla

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Posted 01 February 2013 - 08:23 AM

http://www.khanscope...?productID=1969

looks like antares is still available outside the USA


Khanscope does not have the best reputation... Check out the message on the Skylight telescope site for an example.

http://skylight.myshopify.com/

As well I contacted them about a year ago about these and they had no stock if I remember.

#25 terraclarke

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Posted 01 February 2013 - 10:16 AM

There you go. I love my AT 102. It's a great scope, optically and mechanically. At F11 it definitely has the look and feel of a classic and performs like one too, with the exception of modern features like the dual speed 2 inch focuser. So at the risk of having this post pulled for being off topic, here's a picture.

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