Re: lens of the week: 2000/13.5 and M 2000/13.5

2001-04-24 Thread george de fockert
From: "Bojidar Dimitrov" <[EMAIL PROTECTED]> > Hi, > > a question to the optical-formula gurus. Pentax describes the optics of > this mirror lens as 6 elements in 4 groups. Looking at the diagram that > they provide us, I see 8 elements. I will number them 1 through 8 when > looking from left

RE: lens of the week: 2000/13.5 and M 2000/13.5

2001-04-22 Thread petit miam
Just make sure the focus is set properly when you see Prince Charles, Britney Spears and Boy George having a threesome in Buckingham Palace with the curtains wide open :) > Is there anybody that actually owns one of these? I > often though of getting one and starting up my on > little domestic s

Re: lens of the week: 2000/13.5 and M 2000/13.5

2001-04-20 Thread Philippe Trottier
Hello, about this lense, how good would this make a LX with SD-11 clear for astrophotopgrahy ? equivalent of this would be 5.8" mirror Smith Cassegrain. and a 24x36mm eye-piece... what type of TC could be used with this lense ? Philippe > Hi, > > a question to the optical-formula

Re: lens of the week: 2000/13.5 and M 2000/13.5

2001-04-20 Thread Bojidar Dimitrov
Hi, a question to the optical-formula gurus. Pentax describes the optics of this mirror lens as 6 elements in 4 groups. Looking at the diagram that they provide us, I see 8 elements. I will number them 1 through 8 when looking from left to right. 1 and 2 as well as 5 and 6 seem to be forming

RE: lens of the week: 2000/13.5 and M 2000/13.5

2001-04-19 Thread O'Neill, William
Pål said: If you can focus it! I had troubles with the 1000/11. Try to stop down any lens to F:11 and try focusing it. A 2000mm will be 10 times worse; remeber the focusing accuracy involved. Its pretty much hopeless in my experience. Focusing bracketing is mandatory. I say: Yes, but Pål, in

Re: lens of the week: 2000/13.5 and M 2000/13.5

2001-04-19 Thread K.Takeshita
on 4/19/01 11:16 AM, O'Neill, William at William.O'[EMAIL PROTECTED] wrote: > Is there anybody that actually owns one of these? I often though of getting > one and starting up my on little domestic spy business. You could do some > neat things with it and some 3200 ASA B&W film! > > - > This m

Re: lens of the week: 2000/13.5 and M 2000/13.5

2001-04-19 Thread Pål Jensen
William wrote: > Is there anybody that actually owns one of these? I often though of getting one and >starting up my on little domestic spy >business. You could do some neat things with >it and some 3200 ASA B&W film! If you can focus it! I had troubles with the 1000/11. Try to stop down an