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proudtoshootpentax · 02-12-2008, 04:10 PM

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As long as we're counting lenses that use refraction instead of reflection, we can call a few our own. Yea, the minimum focusing distance might be a bit long...

There's this one too that can be used as a long telephoto

falconeye · 02-12-2008, 06:19 PM

Originally posted by Duck Dodgers

Therefore it's likely similar to either a Schmidt-Cassegrain or a Maksutov-Cassegrain.

Exactly. But it didn't say which one exactly. Both of us know that the question about the best special kind of Cassegrain may start flame wars in some other forums

It says 20" wide so it probably is built like a Celestron C8. Maksutov would be quite expensive at this size already.

Originally posted by Duck Dodgers

Some of us have; I have a 2400mm classical Cassegrain.

Did you do terrestrial photography with it? I posted one photo done at 2000mm f/10 higher up in the thread. Did you have more luck than me in getting sharp images?

falconeye · 02-12-2008, 06:21 PM

Like I say above... Anybody else here shooting terrestrial with a telescope? Post your images...

falconeye · 02-12-2008, 06:27 PM

I have a funny contender

1000-4000mm zoom telelens for Pentax mount!

amateur6 · 02-19-2008, 05:08 AM

Originally posted by falconeye

Did you do terrestrial photography with it? I posted one photo done at 2000mm f/10 higher up in the thread. Did you have more luck than me in getting sharp images?

Maybe I wasn't looking at it closely enough, but I'd call that shot "sharp enough"!

Katsura · 02-20-2008, 02:28 AM

Did someone mention Mother?

I present the Great Great Grand Mother

christinelandon · 02-20-2008, 03:51 AM

Let us give a moment's respect to our great grandmothers, even if they're a little slow by today's standards...what a grand ol' gal!

falconeye · 02-20-2008, 06:01 AM

Originally posted by Katsura

I present the Great Great Grand Mother

Great!
And it is octopod mounted

amateur6 · 02-20-2008, 02:13 PM

This doesn't really come close to any of these, but you gotta admit it's GORGEOUS (20-blade aperture! Imagine the bokeh...):

EARLY GOERZ 750mm DOPPEL ANASTIGMAT SER III BRASS LENS - eBay (item 280200787650 end time Feb-20-08 16:48:14 PST)

And again, quite a bargain by comparison. Until you add in the fabrication of a k-mount adapter...

Anastigmat · 02-23-2008, 08:45 PM

Originally posted by Peter Zack

But the winner is this:
Zeiss Apo Sonnar T* 1700 mm F4 lens: Digital Photography Review

This lens is financed with oil money. Which means we all paid for it when we fill up our gas tanks.

02-12-2008, 04:10 PM	#31
proudtoshootpentax Senior Member Join Date: Jan 2008 Location: Idaho Falls Posts: 110	don't forget... Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here. As long as we're counting lenses that use refraction instead of reflection, we can call a few our own. Yea, the minimum focusing distance might be a bit long... There's this one too that can be used as a long telephoto

02-12-2008, 06:21 PM	#33
falconeye Veteran Member Join Date: Jan 2008 Location: Munich, Alps, Germany Photos: Gallery Posts: 6,871	Post your own "Mother of all Tekephotos" images Like I say above... Anybody else here shooting terrestrial with a telescope? Post your images...

02-12-2008, 06:27 PM	#34
falconeye Veteran Member Join Date: Jan 2008 Location: Munich, Alps, Germany Photos: Gallery Posts: 6,871	Funny I have a funny contender 1000-4000mm zoom telelens for Pentax mount!

02-20-2008, 02:13 PM	#39
amateur6 Senior Member Join Date: Mar 2007 Location: Rhode Island Photos: Gallery Posts: 177	This doesn't really come close to any of these, but you gotta admit it's GORGEOUS (20-blade aperture! Imagine the bokeh...): EARLY GOERZ 750mm DOPPEL ANASTIGMAT SER III BRASS LENS - eBay (item 280200787650 end time Feb-20-08 16:48:14 PST) And again, quite a bargain by comparison. Until you add in the fabrication of a k-mount adapter... Last edited by amateur6; 02-20-2008 at 02:14 PM. Reason: tweak

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02-12-2008, 06:19 PM	#32
falconeye Veteran Member Join Date: Jan 2008 Location: Munich, Alps, Germany Photos: Gallery Posts: 6,871	Originally posted by Duck Dodgers Therefore it's likely similar to either a Schmidt-Cassegrain or a Maksutov-Cassegrain. Exactly. But it didn't say which one exactly. Both of us know that the question about the best special kind of Cassegrain may start flame wars in some other forums It says 20" wide so it probably is built like a Celestron C8. Maksutov would be quite expensive at this size already. Originally posted by Duck Dodgers Some of us have; I have a 2400mm classical Cassegrain. Did you do terrestrial photography with it? I posted one photo done at 2000mm f/10 higher up in the thread. Did you have more luck than me in getting sharp images?

02-19-2008, 05:08 AM	#35
amateur6 Senior Member Join Date: Mar 2007 Location: Rhode Island Photos: Gallery Posts: 177	Originally posted by falconeye Did you do terrestrial photography with it? I posted one photo done at 2000mm f/10 higher up in the thread. Did you have more luck than me in getting sharp images? Maybe I wasn't looking at it closely enough, but I'd call that shot "sharp enough"!

02-20-2008, 02:28 AM	#36
Katsura Senior Member Join Date: Nov 2006 Location: Noosa, Queesnland Photos: Albums Posts: 199	Did someone mention Mother? I present the Great Great Grand Mother

02-20-2008, 03:51 AM	#37
christinelandon Veteran Member Join Date: Jan 2008 Location: Seattle, Washington, USA Photos: Gallery Posts: 812	Let us give a moment's respect to our great grandmothers, even if they're a little slow by today's standards...what a grand ol' gal!

02-20-2008, 06:01 AM	#38
falconeye Veteran Member Join Date: Jan 2008 Location: Munich, Alps, Germany Photos: Gallery Posts: 6,871	Originally posted by Katsura I present the Great Great Grand Mother Great! And it is octopod mounted

02-23-2008, 08:45 PM	#40
Anastigmat Senior Member Join Date: Dec 2007 Location: USA Posts: 126	Originally posted by Peter Zack But the winner is this: Zeiss Apo Sonnar T* 1700 mm F4 lens: Digital Photography Review This lens is financed with oil money. Which means we all paid for it when we fill up our gas tanks.

The Mother of all Telephotos

Win a Pentax Limited Lens: Raffle Now Live!