Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-06-2008, 02:13 AM   #16
Senior Member




Join Date: Oct 2007
Location: Verona, Italy
Posts: 202
The rear lens cap is an Hasselblad

wouldn't be the same [for 1/200 the price] to take a russian MTO with a teleconverter...or maybe two in a row?

02-06-2008, 10:08 AM   #17
Pentaxian
Cambo's Avatar

Join Date: Dec 2007
Location: Vancouver, BC
Photos: Gallery | Albums
Posts: 864
The Mother of all Telephotos? Not quite...

QuoteOriginally posted by jgredline Quote

Zeiss 1700 f=4 POS...




I'm holding out for the 2.8 PRO version...



Cameron
02-06-2008, 11:44 AM   #18
Senior Member
kyrios's Avatar

Join Date: Apr 2007
Location: Indonesia
Posts: 123
Hubble telescope and other famous telescopes in the world are made from CZ optics. If NASA trust on their optics quality , then we should do, right? Time to consider purchasing CZ 85/1.4?

kyrios
02-07-2008, 08:58 AM   #19
Banned




Join Date: Oct 2007
Location: Savannah, U.S./Baguio City, P.H.
Posts: 5,979
canon has apparently back in the day made a lens that out classes everything. having a lens that can see 18 to 32 miles away! this is truly the mother of all lenses, period.



02-07-2008, 07:58 PM   #20
Veteran Member




Join Date: Jan 2008
Location: CT, USA
Posts: 499
QuoteOriginally posted by Cambo Quote
Zeiss 1700 f=4 POS...




I'm holding out for the 2.8 PRO version...



Cameron
That thing isn't a lens, that's a shuttlecraft LOL

Or, (how can I resist)..."That's no moon - it's a SPACE STATION!"

The supertele I want them to make In PK mount is the "Sigmonster" (300 - 800 F 5.6)
02-07-2008, 10:00 PM   #21
Veteran Member
clawhammer's Avatar

Join Date: Sep 2007
Location: Logan, Utah
Photos: Gallery
Posts: 976
QuoteOriginally posted by seamuis Quote
holy........ Yeah. Wowser. The B&H article on the canon 1200 mentions something like 3800mm with a 2x converter and the 1.6 crop of the XTi... Image this beast on an XTi... 8320mm....

*collects jaw off of floor*

edit: just realized that this is for the older MF mount, but still....
02-09-2008, 07:10 PM   #22
Site Supporter




Join Date: Sep 2006
Location: midwest, United States
Photos: Gallery
Posts: 3,322
Never heard Hubbel was made by CZ. CZ had better hope not, since Hubbel was badly crippled by a horribly out of spec mirror. The company that made that part was Perkin Elmer. A famous high quality optical manufacturer (untill this accident). They also built the Vivitar solid cat lenses. They went belly up years later. The second good mirror was made by Eastman Kodak. It still sits in a warehouse on earth somewhere. It was perfect! Hubbel had to be fitted with glasses to fix its vision! It was a good fix but not as good as it should have been. There are bigger scopes than the Hubbel. They are earth based.
thanks
barondla
02-09-2008, 07:13 PM   #23
Senior Member




Join Date: Dec 2007
Location: USA
Posts: 126
QuoteOriginally posted by Peter Zack Quote
Hard to believe there is really a market for a $100K lens.

Then there's always this beast as well:

Attachment 8205
May be an astronaut can handhold this monster in space under weightless conditions. Wonder if NASA will be interested.

02-09-2008, 08:10 PM   #24
Veteran Member
falconeye's Avatar

Join Date: Jan 2008
Location: Munich, Alps, Germany
Photos: Gallery
Posts: 6,863
I accept the Zeiss as a serious contender for biggest.

I reject the Canon lens however. It clearly is a derived mirror scope like the Celestrons etc. A reflector, not a refractor. You can still see the barely covered original scope mountings. It is not even specified, which kind of reflector it is. Newtonian?

The point is, we all can buy a decent 2000mm f/10 reflector and build a huge lens for a fraction of the price of a Pentax lens (BTW question: why isn't anybody doing so?).

If we accepted the Canon lens, we would just ask for the biggest telescope which is the Large Binocular Telescope at Mount Graham, AZ, USA. But knowing the answer, the question becomes boring.

So, what is the biggest true tele lens ever build?
02-09-2008, 08:25 PM   #25
Veteran Member
falconeye's Avatar

Join Date: Jan 2008
Location: Munich, Alps, Germany
Photos: Gallery
Posts: 6,863
Maybe, i should add two photos on topic then...

(1) *istDS 40mm f/4.5 (Pentax DA Limited)

(2) *istDS 2000mm f/10 (Celestron C8, not yet optimally calibrated)

BTW, hard to focus on such short distances even at f/10

Last edited by falconeye; 03-17-2008 at 07:06 PM.
02-10-2008, 04:23 AM   #26
Senior Member




Join Date: Oct 2007
Location: Verona, Italy
Posts: 202
Nikon made it even zoom the 360-1200/11...

http://www.photosynthesis.co.nz/nikon/ais3601200.jpg
02-10-2008, 05:04 PM   #27
Site Supporter




Join Date: Sep 2006
Location: Pennsylvania
Photos: Gallery | Albums
Posts: 1,294
QuoteOriginally posted by kyrios Quote
Hubble telescope and other famous telescopes in the world are made from CZ optics. If NASA trust on their optics quality , then we should do, right? Time to consider purchasing CZ 85/1.4?

kyrios
Kyrios,

Actually, the main lens elements in the hubble telescope (main mirrors) are made and ground just doen the road from where I live in Pennsylvania. Unfortunately, a hair thickness error in polishing made the lens somewhat myopic. It was later corrected, I thought by the same company, but above poster probably is correct in saying Kodak made the correcting lens.


Stephen

Last edited by SCGushue; 02-10-2008 at 05:12 PM.
02-11-2008, 06:44 AM   #28
Site Supporter




Join Date: Sep 2006
Location: midwest, United States
Photos: Gallery
Posts: 3,322
Not saying Kodak made the correcting lens. Don't know who made it. At the same time NASA had a backup lens made in case something happened to the original. Faulty testing ( many say lack of testing) sent the bad one into space. Proper testing would have grounded it and sent up the good Kodak lens. Such a shame. Hubbel could have been even better than it is. It is incredible.
thanks
barondla
02-11-2008, 08:46 AM   #29
Inactive Account




Join Date: Jan 2008
Location: Orlando, FL
Posts: 37
The good/backup lens was made by Kodak, you can check Wiki
02-12-2008, 07:50 AM   #30
Veteran Member
Duck Dodgers's Avatar

Join Date: Dec 2007
Location: in the 24½th Century!
Photos: Gallery
Posts: 439
QuoteOriginally posted by falconeye Quote
I reject the Canon lens however. It clearly is a derived mirror scope like the Celestrons etc. A reflector, not a refractor. You can still see the barely covered original scope mountings. It is not even specified, which kind of reflector it is. Newtonian?
It does say what kind of reflector it is. It's catadioptric; i.e., it has both lenses and mirrors. So, it's not a Newtonian (no lenses; angled secondary mirror near the aperture) and it's not a classical Cassegrain (no lenses; "folded" light path through primary mirror). Therefore it's likely similar to either a Schmidt-Cassegrain or a Maksutov-Cassegrain.

QuoteQuote:
The point is, we all can buy a decent 2000mm f/10 reflector and build a huge lens for a fraction of the price of a Pentax lens (BTW question: why isn't anybody doing so?).
Some of us have; I have a 2400mm classical Cassegrain.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
mother, pentax news, pentax rumors, telephotos
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Inexpensive telephotos nick c Pentax SLR Lens Discussion 20 11-13-2009 07:49 PM
Two questions, one thread: Telephotos and focus screens, oh my! Dubious Drewski Pentax DSLR Discussion 6 09-10-2009 01:11 PM
Using long telephotos & Shake reduction mr.voigtlander Pentax DSLR Discussion 28 06-04-2009 11:56 PM
Best long (affordable) telephotos? Finn Pentax SLR Lens Discussion 16 10-12-2007 01:44 PM
New DA* Telephotos kent vinyard Pentax News and Rumors 9 08-30-2007 01:48 AM



All times are GMT -7. The time now is 10:32 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top