KP custom，DFA*85/1.4 CP+ Exhibit

reh321 · 12-15-2019, 10:36 AM

Originally posted by Class A

This pretty much implies silent AF these days.

'Silent' AF has been expected by some of us for many years. In 1995 I switched from Pentax to Canon because only the EF was 'quiet", and I stayed with Canon until about four years ago.

Mistral75 · 12-15-2019, 01:12 PM

Originally posted by mlt

A good set of extension tubes with af and aperture contact pass throughs would be cheaper for Pentax to develop and probably sell more of, and allow use of the existing DA* 200 and 300 primes to go to 1:1 and beyond.

You'd need very long extension tubes to reach 1:1 with a conventional 200mm and more so with a 300mm.

**mlt** · 12-15-2019, 01:41 PM

Originally posted by Mistral75

You'd need very long extension tubes to reach 1:1 with a conventional 200mm and more so with a 300mm.

It would be interesting to see the calculations of how much extension is needed to achieve 1:1 at specific working distances.

Kunzite · 12-15-2019, 02:37 PM

Originally posted by mlt

It would be interesting to see the calculations of how much extension is needed to achieve 1:1 at specific working distances.

Equal to the focal length (if the lens itself is at infinity).

Mistral75 · 12-15-2019, 02:40 PM

Originally posted by mlt

It would be interesting to see the calculations of how much extension is needed to achieve 1:1 at specific working distances.

They can't be done simply because they would require to know the focal length at the minimum focus distance (MFD) and the distance between the principal planes/points H and H'.

With the lens focused on infinity, the extension required to achieve 1:1 is equal to the focal length (20cm and 30cm in our case).

Assuming that the lenses keep their focal length at MFD, the extension required to achieve 1:1 with the lens focused on MFD is equal to 16cm for the 200mm f/2.8 (MFD = 1.2m) and 21.8cm for the 300mm f/4 (MFD = 1.4m).

**mlt** · 12-15-2019, 02:59 PM - **1 Like**

160mm (over 6 inches) of extension tube(s) = probably not the most stable of a macro setup, back to the drawing board

**TwoUptons** · 12-15-2019, 03:16 PM

Originally posted by mlt

160mm (over 6 inches) of extension tube(s) = probably not the most stable of a macro setup, back to the drawing board

Make it thick with a tripod foot and you’re good

But yeah, that’s a lot of extension...

-Eric

**mlt** · 12-15-2019, 03:25 PM

Supporting both a K-1 size body and a heavy lens on that amount of extension ventures in to the world of the technical monorail camera setup. Not exactly a big selling item.

CNunez · 12-18-2019, 10:58 AM

So, all kinds of random talk in this thread. Before it derails too much. Any news whatsoever on when this monster will be released??

house · 12-18-2019, 11:02 AM

Originally posted by CNunez

So, all kinds of random talk in this thread. Before it derails too much. Any news whatsoever on when this monster will be released??

Nothing ever leaks from Pentax.

MikeyBugs95 · 12-18-2019, 01:03 PM - **1 Like**

Originally posted by house

Nothing ever leaks from Pentax.

Pentax is more tight lipped than the NSA is about spying on American citizens.

house · 12-18-2019, 01:07 PM - **1 Like**

Originally posted by MikeyBugs95

Pentax is more tight lipped than the NSA is about spying on American citizens.

NSA has leaks Pentax doesn't.

**mlt** · 12-18-2019, 01:44 PM

Ricoh doesn’t even give a nod or a wink when asked about rumored release dates of new products, they love to keep info very closely held. I think we’re all accustomed to that by now

nnky · 12-18-2019, 05:57 PM

First half of next year.

Kingman · 12-18-2019, 08:10 PM - **2 Likes**

Last weekend, I asked a Ricoh/Pentax Factory Representative. He joking said, we're last to know. He said, the consumers are better informed than they are about product releases from the company products they represent.

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12-15-2019, 10:36 AM	#631
reh321 Pentaxian Join Date: Nov 2014 Location: South Bend, IN, USA Photos: Gallery \| Albums Posts: 23,185	Originally posted by Class A This pretty much implies silent AF these days. 'Silent' AF has been expected by some of us for many years. In 1995 I switched from Pentax to Canon because only the EF was 'quiet", and I stayed with Canon until about four years ago.

12-15-2019, 01:12 PM	#632
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	Originally posted by mlt A good set of extension tubes with af and aperture contact pass throughs would be cheaper for Pentax to develop and probably sell more of, and allow use of the existing DA* 200 and 300 primes to go to 1:1 and beyond. You'd need very long extension tubes to reach 1:1 with a conventional 200mm and more so with a 300mm.

12-15-2019, 01:41 PM	#633
mlt Site Supporter Join Date: Dec 2007 Posts: 1,159	Originally posted by Mistral75 You'd need very long extension tubes to reach 1:1 with a conventional 200mm and more so with a 300mm. It would be interesting to see the calculations of how much extension is needed to achieve 1:1 at specific working distances.

12-15-2019, 02:37 PM	#634
Kunzite Pentaxian Join Date: Apr 2007 Location: Romania Posts: 15,132	Originally posted by mlt It would be interesting to see the calculations of how much extension is needed to achieve 1:1 at specific working distances. Equal to the focal length (if the lens itself is at infinity).

12-15-2019, 02:40 PM	#635
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	Originally posted by mlt It would be interesting to see the calculations of how much extension is needed to achieve 1:1 at specific working distances. They can't be done simply because they would require to know the focal length at the minimum focus distance (MFD) and the distance between the principal planes/points H and H'. With the lens focused on infinity, the extension required to achieve 1:1 is equal to the focal length (20cm and 30cm in our case). Assuming that the lenses keep their focal length at MFD, the extension required to achieve 1:1 with the lens focused on MFD is equal to 16cm for the 200mm f/2.8 (MFD = 1.2m) and 21.8cm for the 300mm f/4 (MFD = 1.4m).

12-15-2019, 02:59 PM - 1 Like	#636
mlt Site Supporter Join Date: Dec 2007 Posts: 1,159	160mm (over 6 inches) of extension tube(s) = probably not the most stable of a macro setup, back to the drawing board

12-15-2019, 03:16 PM	#637
TwoUptons Loyal Site Supporter Join Date: Nov 2015 Photos: Albums Posts: 4,225	Originally posted by mlt 160mm (over 6 inches) of extension tube(s) = probably not the most stable of a macro setup, back to the drawing board Make it thick with a tripod foot and you’re good But yeah, that’s a lot of extension... -Eric

12-15-2019, 03:25 PM	#638
mlt Site Supporter Join Date: Dec 2007 Posts: 1,159	Supporting both a K-1 size body and a heavy lens on that amount of extension ventures in to the world of the technical monorail camera setup. Not exactly a big selling item.

12-18-2019, 10:58 AM	#639
CNunez Senior Member Join Date: Dec 2014 Photos: Gallery Posts: 168	So, all kinds of random talk in this thread. Before it derails too much. Any news whatsoever on when this monster will be released??

12-18-2019, 11:02 AM	#640
house Pentaxian Join Date: May 2015 Photos: Albums Posts: 3,306	Originally posted by CNunez So, all kinds of random talk in this thread. Before it derails too much. Any news whatsoever on when this monster will be released?? Nothing ever leaks from Pentax.

12-18-2019, 01:03 PM - 1 Like	#641
MikeyBugs95 Pentaxian Join Date: Sep 2017 Location: New York Photos: Gallery \| Albums Posts: 1,206	Originally posted by house Nothing ever leaks from Pentax. Pentax is more tight lipped than the NSA is about spying on American citizens.

12-18-2019, 01:07 PM - 1 Like	#642
house Pentaxian Join Date: May 2015 Photos: Albums Posts: 3,306	Originally posted by MikeyBugs95 Pentax is more tight lipped than the NSA is about spying on American citizens. NSA has leaks Pentax doesn't.

12-18-2019, 01:44 PM	#643
mlt Site Supporter Join Date: Dec 2007 Posts: 1,159	Ricoh doesn’t even give a nod or a wink when asked about rumored release dates of new products, they love to keep info very closely held. I think we’re all accustomed to that by now

12-18-2019, 05:57 PM	#644
nnky Junior Member Join Date: Sep 2019 Posts: 29	First half of next year.

12-18-2019, 08:10 PM - 2 Likes	#645
Kingman Senior Member Join Date: Feb 2017 Location: North Texas Posts: 199	Last weekend, I asked a Ricoh/Pentax Factory Representative. He joking said, we're last to know. He said, the consumers are better informed than they are about product releases from the company products they represent.