Hi,
I already made my Achromatic 80mm F10 refractor, now looking towards to make a larger objective telescope with shorter focal length. anyone know where can I get larger Achromatic / Doublet / ED lens with cell?
Thank you
Kimo
where to find Refractor Lens?
- orly_andico
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there's this guy on ebay who sells "ED" lenses from China. quality unknown.
istar sells achromatic lenses in various sizes.
http://www.istar-optical.com/istar_017.htm
the 5" f5.5 is $370.
although if i were you i'd just look out for a used ED telescope on astromart. you can get an orion 100ED/skywatcher 100ED for between $400 and $500 USD.
istar sells achromatic lenses in various sizes.
http://www.istar-optical.com/istar_017.htm
the 5" f5.5 is $370.
although if i were you i'd just look out for a used ED telescope on astromart. you can get an orion 100ED/skywatcher 100ED for between $400 and $500 USD.
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Hi Kimo.....
Istar is now working on 150 F5 R75 Anastigmatic Doublets using the new Lanthanum glass.
This time they'll figure it to R75, when means the CA is 75% lesser than the std one.
The price for the lens cell is approx. in the 950-1100 dollar range, and the OTA price should be in 1600 dollar. The finalized price should be out by end of this month. Weight should be in 5-7 kilo range for OTA
The bad news is that the waiting time is aound 60 days, for them to build the first few pcs.
But if you are someone who have a big and tall mount, Istar has one last one left of the 160 F12 Lanthanum APO triplet lens cell.
Is offered to anyone at USD2095, regular price is 2875 dollars or possibly 2975 dollars.
160 F12 is Triplet, not doublet. It is APO triplet using rare Lanthanum earth glass (same glass used in Pentax eyepieces, Nikon lenses, etc..)
REgards
James Ling
Istar is now working on 150 F5 R75 Anastigmatic Doublets using the new Lanthanum glass.
This time they'll figure it to R75, when means the CA is 75% lesser than the std one.
The price for the lens cell is approx. in the 950-1100 dollar range, and the OTA price should be in 1600 dollar. The finalized price should be out by end of this month. Weight should be in 5-7 kilo range for OTA
The bad news is that the waiting time is aound 60 days, for them to build the first few pcs.
But if you are someone who have a big and tall mount, Istar has one last one left of the 160 F12 Lanthanum APO triplet lens cell.
Is offered to anyone at USD2095, regular price is 2875 dollars or possibly 2975 dollars.
160 F12 is Triplet, not doublet. It is APO triplet using rare Lanthanum earth glass (same glass used in Pentax eyepieces, Nikon lenses, etc..)
REgards
James Ling
- orly_andico
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istar does make some good lenses.. but they are made in Eastern Europe and are, frankly, on the expensive side. Of course a 160mm triplet APO for $2100 USD is an amazing bargain (compare the $5000+ TEC 160FL which is also made in Eastern Europe).
but.. i can't justify spending $2100 USD on a refractor. so I will content myself with my 100mm ED.
but.. i can't justify spending $2100 USD on a refractor. so I will content myself with my 100mm ED.
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ISTAR made 2 pc of this newly developed 160 F12 Lanthanum APO triplets, and the first buyer will produce a very extensive review and also this article will be published in ATT magazine, possibly Astronomy magazine.
But for our region, we should go for max around F8.
Below is what Ales , from ISTAR told me about my query to him.....
It is impossible to build 150 F5 Lanthanum APO triplet, it would not be APO but only visual semi APO, we can get APO performance at F9 and slower only.
If we have anyone around in our region like to get the F9, perhaps can make a special request to Ales to build for us....
REgards
James Ling
But for our region, we should go for max around F8.
Below is what Ales , from ISTAR told me about my query to him.....
It is impossible to build 150 F5 Lanthanum APO triplet, it would not be APO but only visual semi APO, we can get APO performance at F9 and slower only.
If we have anyone around in our region like to get the F9, perhaps can make a special request to Ales to build for us....
REgards
James Ling
- orly_andico
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- orly_andico
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The 160F12 is almost 5" longer than my 6Ft 8" Istar scope.
I use the G11 losmandy , and the scope is almost touching the ground when it is pointing up.
So you will need to piggy back another scope at the back of the OTA, so as to move the scope further away from the viewing side.
The latest CGEM DX mount will be able to take this 160F12, as it will never be exceeding 40 lbs.
REgards
James Ling
I use the G11 losmandy , and the scope is almost touching the ground when it is pointing up.
So you will need to piggy back another scope at the back of the OTA, so as to move the scope further away from the viewing side.
The latest CGEM DX mount will be able to take this 160F12, as it will never be exceeding 40 lbs.
REgards
James Ling