Images of the New Lenses

ogl · 02-14-2012, 12:32 AM

Originally posted by DaveBlack

Please don't do it as a 85/2.0. What a waste of R&D resources. Just re-release the excellent FA*85/1.4 as a DFA*85/1.4.

Dave

I don't think that 128 mm is usefull length at APS-C...
105 or 115 mm are better. or 135 mm.

Anyway, as for me - old FA*85/1.4 is not better than FA77/1.8. Faster - yes...But the picture is nothing special...
I'd prefer DA90/2. or DA90/3.5 PANCAKE LIMITED - but there are no such lenses in roadmap

gazonk · 02-14-2012, 01:37 AM

Originally posted by ogl

I don't think that 128 mm is usefull length at APS-C...
105 or 115 mm are better. or 135 mm.

It's actually closer to 130 than 128 (K-5 crop is 1.52, K-7/K20d crop is 1.53) - i.e. close enough to 135, IMHO. Besides, Pentax used to have both 100, 120, 135 and 150mm lenses!

Wheatfield · 02-14-2012, 06:19 AM

Originally posted by Urkeldaedalus

I want full frame, too, but really if you want a full frame camera you should buy one from a company that already makes one. If you keep waiting for Pentax to do it you'll be bound to be disappointed .....

Not to mention being an annoying dickweed on forums

DaveBlack · 02-14-2012, 06:23 AM

Originally posted by ogl

I don't think that 128 mm is usefull length at APS-C...
105 or 115 mm are better. or 135 mm.

Anyway, as for me - old FA*85/1.4 is not better than FA77/1.8. Faster - yes...But the picture is nothing special...
I'd prefer DA90/2. or DA90/3.5 PANCAKE LIMITED - but there are no such lenses in roadmap

I would like both a 85/1.4 and a 135/1.8. Still before those two I would love a DA*29/1.4 for a weather-sealed normal lens.

Dave

dgaies · 02-14-2012, 06:24 AM

Originally posted by Wheatfield

Not to mention being an annoying dickweed on forums

Excellent use of dickweed.

aurele · 02-14-2012, 06:40 AM

from lenses to dickweed, nice transition !

ogl · 02-14-2012, 06:47 AM

Originally posted by DaveBlack

I would like both a 85/1.4 and a 135/1.8. Still before those two I would love a DA*29/1.4 for a weather-sealed normal lens.

Dave

Do you think this lens could be small?

Why 29 mm, not 28 or 30 mm?

falconeye · 02-14-2012, 06:52 AM

Originally posted by ogl

Why 29 mm, not 28 or 30 mm?

Many people think 29mm is APSC's image circle (K-5's is 28.4mm though).

**monochrome** · 02-14-2012, 07:21 AM

Originally posted by falconeye

I didn't look it up now. But isn't it rays into the car's interiour which causes heat up? If so, black paint could still heat up much more rapidely than silver. It just wouldn't matter much with a car heating up through the windows. Black paint would even radiate more heat from the car's interiour to cool it down ...

With that illustration I was asking the poster to prove his assertion about white painted lenses by referencing the definitive study. I suspect so many of these assertions are just urban legends.

I found a related article about cars paint colors. The article states the largest controllable factor was whether the auto glass wasd tinted, then the amount of glass in the "greenhouse" Tinted glass or less glass = cooler car.

For this discussion the real question is whether white paint actually reduces barrel expansion at the marginal point of lens alignment deflection, or whether with either color the marginal temperature of the barrel is achieved.

falconeye · 02-14-2012, 07:25 AM

Originally posted by monochrome

For this discussion the real question is whether white paint actually reduces barrel expansion at the marginal point of lens alignment deflection, or whether with either color the marginal temperature of the barrel is achieved.

If you carry it this far, don't you have to take the question of inner-tube air turbulence and their impact on optical performance into account? I know that this is an important topic with scopes which are air-filled (which unlike Hubble, most are

).

DaveBlack · 02-14-2012, 10:00 AM

Originally posted by ogl

Do you think this lens could be small?

Why 29 mm, not 28 or 30 mm?

Because it seems like Pentax likes to use uncommon and different focal lengths.

Anything between 28-30 would be ok with me. No this lens will not be small. I will guess a 77mm filter size.

ogl · 02-14-2012, 08:10 PM

Originally posted by DaveBlack

Because it seems like Pentax likes to use uncommon and different focal lengths.

Anything between 28-30 would be ok with me. No this lens will not be small. I will guess a 77mm filter size.

The problem is no such lens in roadmap till 2013 and later.

Malsi · 02-16-2012, 02:55 AM

Hi,

What will be the Sigma strategy? They were waiting for the Pentax/Ricoh one... but today, will they launch new K-mount lens (that already exists for Nikon, Canon...)?

Regards.

Malsi

eddie1960 · 02-16-2012, 10:13 AM

Originally posted by Malsi

Hi,

What will be the Sigma strategy? They were waiting for the Pentax/Ricoh one... but today, will they launch new K-mount lens (that already exists for Nikon, Canon...)?

Regards.

Malsi

If it wasn't for sigma we'd have no fast 20-30mm primes available for K mount. As it sits we have 24/28/30/ plus the 85 all fast none of which exist in the Pentax lineup plus the UWA & fisheye primes like the 4.5 and the 10mm
and pending 150 which is also a missing FL (no 135 from anyone

)

jogiba · 02-16-2012, 10:50 AM

Originally posted by ElJamoquio

30/1.2? That would need about 86mm front filter or so, correct?

A 30mm F1.2 for APS-C sensor should not need a 86mm filter size since the 30mm F1.4 Sigma only has a 62mm filter the FF/35mm Pentax A 50mm F1.2 only needs a 52mm filter and the Pentax FA 85mm F1.4 a 67mm filter.

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02-14-2012, 12:32 AM	#91
ogl Banned Join Date: Dec 2007 Location: Sankt Peterburg Photos: Gallery \| Albums Posts: 8,382	Originally posted by DaveBlack Please don't do it as a 85/2.0. What a waste of R&D resources. Just re-release the excellent FA85/1.4 as a DFA85/1.4. Dave I don't think that 128 mm is usefull length at APS-C... 105 or 115 mm are better. or 135 mm. Anyway, as for me - old FA*85/1.4 is not better than FA77/1.8. Faster - yes...But the picture is nothing special... I'd prefer DA90/2. or DA90/3.5 PANCAKE LIMITED - but there are no such lenses in roadmap

02-14-2012, 01:37 AM	#92
gazonk Pentaxian Join Date: Feb 2009 Location: Oslo area, Norway Photos: Gallery \| Albums Posts: 3,746	Originally posted by ogl I don't think that 128 mm is usefull length at APS-C... 105 or 115 mm are better. or 135 mm. It's actually closer to 130 than 128 (K-5 crop is 1.52, K-7/K20d crop is 1.53) - i.e. close enough to 135, IMHO. Besides, Pentax used to have both 100, 120, 135 and 150mm lenses!

02-14-2012, 06:19 AM	#93
Wheatfield Moderator Join Date: Apr 2008 Location: The wheatfields of Canada Posts: 15,981	Originally posted by Urkeldaedalus I want full frame, too, but really if you want a full frame camera you should buy one from a company that already makes one. If you keep waiting for Pentax to do it you'll be bound to be disappointed ..... Not to mention being an annoying dickweed on forums

02-14-2012, 06:23 AM	#94
DaveBlack Veteran Member Join Date: Jan 2011 Location: Louisville, Kentucky Posts: 441	Originally posted by ogl I don't think that 128 mm is usefull length at APS-C... 105 or 115 mm are better. or 135 mm. Anyway, as for me - old FA85/1.4 is not better than FA77/1.8. Faster - yes...But the picture is nothing special... I'd prefer DA90/2. or DA90/3.5 PANCAKE LIMITED - but there are no such lenses in roadmap I would like both a 85/1.4 and a 135/1.8. Still before those two I would love a DA29/1.4 for a weather-sealed normal lens. Dave

02-14-2012, 06:24 AM	#95
dgaies Veteran Member Join Date: Oct 2009 Location: Maryland / Washington DC Posts: 3,917	Originally posted by Wheatfield Not to mention being an annoying dickweed on forums Excellent use of dickweed.

02-14-2012, 06:40 AM	#96
aurele Veteran Member Join Date: Jan 2011 Location: Paris, France Photos: Albums Posts: 3,217	from lenses to dickweed, nice transition !

02-14-2012, 06:47 AM	#97
ogl Banned Join Date: Dec 2007 Location: Sankt Peterburg Photos: Gallery \| Albums Posts: 8,382	Originally posted by DaveBlack I would like both a 85/1.4 and a 135/1.8. Still before those two I would love a DA*29/1.4 for a weather-sealed normal lens. Dave Do you think this lens could be small? Why 29 mm, not 28 or 30 mm?

02-14-2012, 06:52 AM	#98
falconeye Veteran Member Join Date: Jan 2008 Location: Munich, Alps, Germany Photos: Gallery Posts: 6,871	Originally posted by ogl Why 29 mm, not 28 or 30 mm? Many people think 29mm is APSC's image circle (K-5's is 28.4mm though).

02-14-2012, 07:21 AM	#99
monochrome Loyal Site Supporter Join Date: Mar 2008 Location: Working From Home Photos: Gallery \| Albums Posts: 26,276	Originally posted by falconeye I didn't look it up now. But isn't it rays into the car's interiour which causes heat up? If so, black paint could still heat up much more rapidely than silver. It just wouldn't matter much with a car heating up through the windows. Black paint would even radiate more heat from the car's interiour to cool it down ... With that illustration I was asking the poster to prove his assertion about white painted lenses by referencing the definitive study. I suspect so many of these assertions are just urban legends. I found a related article about cars paint colors. The article states the largest controllable factor was whether the auto glass wasd tinted, then the amount of glass in the "greenhouse" Tinted glass or less glass = cooler car. For this discussion the real question is whether white paint actually reduces barrel expansion at the marginal point of lens alignment deflection, or whether with either color the marginal temperature of the barrel is achieved.

02-14-2012, 07:25 AM	#100
falconeye Veteran Member Join Date: Jan 2008 Location: Munich, Alps, Germany Photos: Gallery Posts: 6,871	Originally posted by monochrome For this discussion the real question is whether white paint actually reduces barrel expansion at the marginal point of lens alignment deflection, or whether with either color the marginal temperature of the barrel is achieved. If you carry it this far, don't you have to take the question of inner-tube air turbulence and their impact on optical performance into account? I know that this is an important topic with scopes which are air-filled (which unlike Hubble, most are ).

02-14-2012, 10:00 AM	#101
DaveBlack Veteran Member Join Date: Jan 2011 Location: Louisville, Kentucky Posts: 441	Originally posted by ogl Do you think this lens could be small? Why 29 mm, not 28 or 30 mm? Because it seems like Pentax likes to use uncommon and different focal lengths. Anything between 28-30 would be ok with me. No this lens will not be small. I will guess a 77mm filter size.

02-14-2012, 08:10 PM	#102
ogl Banned Join Date: Dec 2007 Location: Sankt Peterburg Photos: Gallery \| Albums Posts: 8,382	Originally posted by DaveBlack Because it seems like Pentax likes to use uncommon and different focal lengths. Anything between 28-30 would be ok with me. No this lens will not be small. I will guess a 77mm filter size. The problem is no such lens in roadmap till 2013 and later.

02-16-2012, 02:55 AM	#103
Malsi Senior Member Join Date: Aug 2009 Location: Versailles Posts: 298	Hi, What will be the Sigma strategy? They were waiting for the Pentax/Ricoh one... but today, will they launch new K-mount lens (that already exists for Nikon, Canon...)? Regards. Malsi

02-16-2012, 10:13 AM	#104
eddie1960 Veteran Member Join Date: Aug 2010 Location: Toronto Photos: Gallery \| Albums Posts: 13,666	Originally posted by Malsi Hi, What will be the Sigma strategy? They were waiting for the Pentax/Ricoh one... but today, will they launch new K-mount lens (that already exists for Nikon, Canon...)? Regards. Malsi If it wasn't for sigma we'd have no fast 20-30mm primes available for K mount. As it sits we have 24/28/30/ plus the 85 all fast none of which exist in the Pentax lineup plus the UWA & fisheye primes like the 4.5 and the 10mm and pending 150 which is also a missing FL (no 135 from anyone )

02-16-2012, 10:50 AM	#105
jogiba Banned Join Date: Sep 2006 Location: Millstone,NJ Posts: 6,491	Originally posted by ElJamoquio 30/1.2? That would need about 86mm front filter or so, correct? A 30mm F1.2 for APS-C sensor should not need a 86mm filter size since the 30mm F1.4 Sigma only has a 62mm filter the FF/35mm Pentax A 50mm F1.2 only needs a 52mm filter and the Pentax FA 85mm F1.4 a 67mm filter.