Win a Pentax Limited Lens: Raffle Now Live!

barrystock · 02-18-2018, 03:12 PM - **1 Like**

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It look's in perfect shape with all accessories. The price is breathtaking.

(I have nothing to do with the listing. I regularly browse M42 lenses for sale.)

**monochrome** · 02-18-2018, 03:16 PM

Wow! It is a thrill just to see the photos of such a lens.

**TwoUptons** · 02-18-2018, 03:18 PM - **1 Like**

You could get this and the night vision kit that’s bouncing around there and have something really unusual...

But definitely high on the cool meter...

-Eric

**jatrax** · 02-18-2018, 04:27 PM

Take a good look folks. Chances of seeing another complete set like that are ........................................................

**BigMackCam** · 02-18-2018, 04:44 PM

Oh my... One for serious collectors, clearly. Given the condition, I guess it's worth that kind of money to them.

As @monochrome says, just seeing the photos is a thrill...

**SteveinSLC** · 02-18-2018, 05:26 PM

Wonder how that would work for astrophotography in the non-visible spectrum.

**kiwi_jono** · 02-18-2018, 05:37 PM

Wow - would love to have that.

Sadly, as a collectors piece and at that sort of price, I can't see it getting any serious use.

tvdtvdtvd · 02-18-2018, 06:35 PM

It's actually a bit of a shame that it's in such pristine condition. Appears it was never used and at that price will likely never be used.

As an aside, can anyone explain a quartz/fluorite lens element? I know what quartz is, (SiO2), and I know what fluorite is, (CaF2),
but I have no idea about quartz/fluorite.

Are some of the elements fluorite and others quartz?
Is it an admixture of quartz and fluorite?, (unlikely, as that would produce a very uneven and unpredictable light path as light
refracted between areas of fluorite and quartz).
Or perhaps each element is a sandwich of fluorite and quartz?, (that would make sense).
Or maybe it's a calcium silicate fluoride?, (not actually quartz or fluorite).
Or a calcium & fluorine bearing amorphous silica glass?, (also not quartz or fluorite).

The mineralogist in me really wants to know.

**pentaxus** · 02-18-2018, 11:53 PM

Some of the lens elements are quartz and some are fluorite. People who are into UV and IR photography get upset when a non-serious user buys these. It works for any kind of photography in the specified bandwidth, but many astrophotos are taken in frequencies that are out of this range.

Arjay Bee · 02-19-2018, 04:37 AM

Oh no wont ship to Australia so I'm out...

barrystock · 02-26-2018, 09:07 AM

It's been relisted, with a HIGHER starting bid. So what could have been a $3,900 purchase is now a $5,200 purchase. I don't anticipate this selling any time soon.

02-18-2018, 03:12 PM - 1 Like	#1
barrystock New Member Join Date: Feb 2014 Posts: 5	An Ultra Achromatic Takumar 85mm 4.5 is up on EBay at the moment 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. It look's in perfect shape with all accessories. The price is breathtaking. (I have nothing to do with the listing. I regularly browse M42 lenses for sale.)

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02-18-2018, 03:16 PM	#2
monochrome Loyal Site Supporter Join Date: Mar 2008 Location: Working From Home Photos: Gallery \| Albums Posts: 26,276	Wow! It is a thrill just to see the photos of such a lens.

02-18-2018, 03:18 PM - 1 Like	#3
TwoUptons Loyal Site Supporter Join Date: Nov 2015 Photos: Albums Posts: 4,225	You could get this and the night vision kit that’s bouncing around there and have something really unusual... But definitely high on the cool meter... -Eric

02-18-2018, 04:27 PM	#4
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,991	Take a good look folks. Chances of seeing another complete set like that are ........................................................

02-18-2018, 04:44 PM	#5
BigMackCam Digitiser of Film Join Date: Mar 2010 Location: North East of England Posts: 20,702	Oh my... One for serious collectors, clearly. Given the condition, I guess it's worth that kind of money to them. As @monochrome says, just seeing the photos is a thrill...

02-18-2018, 05:26 PM	#6
SteveinSLC Site Supporter Join Date: Mar 2017 Photos: Gallery \| Albums Posts: 568	Wonder how that would work for astrophotography in the non-visible spectrum.

02-18-2018, 05:37 PM	#7
kiwi_jono Loyal Site Supporter Join Date: Dec 2009 Location: Christchurch, New Zealand Photos: Gallery \| Albums Posts: 2,437	Wow - would love to have that. Sadly, as a collectors piece and at that sort of price, I can't see it getting any serious use.

02-18-2018, 06:35 PM	#8
tvdtvdtvd Veteran Member Join Date: Jan 2010 Posts: 1,665	It's actually a bit of a shame that it's in such pristine condition. Appears it was never used and at that price will likely never be used. As an aside, can anyone explain a quartz/fluorite lens element? I know what quartz is, (SiO2), and I know what fluorite is, (CaF2), but I have no idea about quartz/fluorite. Are some of the elements fluorite and others quartz? Is it an admixture of quartz and fluorite?, (unlikely, as that would produce a very uneven and unpredictable light path as light refracted between areas of fluorite and quartz). Or perhaps each element is a sandwich of fluorite and quartz?, (that would make sense). Or maybe it's a calcium silicate fluoride?, (not actually quartz or fluorite). Or a calcium & fluorine bearing amorphous silica glass?, (also not quartz or fluorite). The mineralogist in me really wants to know.

02-18-2018, 11:53 PM	#9
pentaxus Site Supporter Join Date: Jun 2010 Location: Central Coast, CA Posts: 1,320	Some of the lens elements are quartz and some are fluorite. People who are into UV and IR photography get upset when a non-serious user buys these. It works for any kind of photography in the specified bandwidth, but many astrophotos are taken in frequencies that are out of this range.

02-19-2018, 04:37 AM	#10
Arjay Bee Pentaxian Join Date: Sep 2006 Location: Horn Island, Torres Straits, Q Photos: Gallery Posts: 4,715	Oh no wont ship to Australia so I'm out...

02-26-2018, 09:07 AM	#11
barrystock New Member Join Date: Feb 2014 Posts: 5 Original Poster	It's been relisted, with a HIGHER starting bid. So what could have been a $3,900 purchase is now a $5,200 purchase. I don't anticipate this selling any time soon.

An Ultra Achromatic Takumar 85mm 4.5 is up on EBay at the moment

Win a Pentax Limited Lens: Raffle Now Live!