DFA*50 1.4 coming

angerdan · 11-03-2017, 04:37 PM

It's not a macro lens, since it has been announced as ultra wide angle zoom lens on the roadmap.
ALso a macro zoom makes no sense, especially at this short focal length.

OoKU · 11-03-2017, 04:40 PM

yaotomicamera said：
I want to sell it as a starlit lens and things with things
High resolution and high performance from opening of the diaphragm were also introduced as "starlit lens"
High-performance lens in which the point source at the periphery appears as a point
In other words, it is expected to be a fabulous lens with extremely reduced aberrations
I hear a story that considering the installation of "dew condensation prevention heater" to support it

**RGlasel** · 11-03-2017, 04:47 PM

Originally posted by OoKU

I want to sell it as a starlit lens and things with things

"Starlit" I think I understand, but "things with things?"

Originally posted by OoKU

I hear a story that considering the installation of "dew condensation prevention heater" to support it

Perfect, a rear window defroster for my lens( or in Ford Motor Company parlance, electrically heated backlight). Will the metal conducting lines be visible in photos?

OoKU · 11-03-2017, 05:34 PM

Originally posted by RGlasel

"Starlit" I think I understand, but "things with things?"Perfect, a rear window defroster for my lens( or in Ford Motor Company parlance, electrically heated backlight). Will the metal conducting lines be visible in photos?

Do not mind，it's translate from Japanese by google.

JPT · 11-03-2017, 07:52 PM

Originally posted by OoKU

yaotomicamera said：
I want to sell it as a starlit lens and things with things
High resolution and high performance from opening of the diaphragm were also introduced as "starlit lens"
High-performance lens in which the point source at the periphery appears as a point
In other words, it is expected to be a fabulous lens with extremely reduced aberrations
I hear a story that considering the installation of "dew condensation prevention heater" to support it

Ooku - I read this two, but I could not understand whether "starlit" is referring to:

A) The fact that it is part of the DA star series, and the high quality that implies
B) The suitability of the lens for taking images of stars
A&B) The writer is doing a kind of word-play on both of the above

mee · 11-03-2017, 08:48 PM

I think they just mean it is a fast UWA for taking star/nightsky astrophotography.

JPT · 11-03-2017, 10:46 PM

I think you are probably right, and they are positioning this lens as the ideal companion for Astrotracer.

In the light of Yaotomi’s comment, it would be very interesting if the mystery switch on the lens turned out to be an on/off switch for an integrated heating element to prevent condensation on the lens.

MMVIII · 11-04-2017, 12:24 AM

Originally posted by JPT

I think you are probably right, and they are positioning this lens as the ideal companion for Astrotracer.

In the light of Yaotomi’s comment, it would be very interesting if the mystery switch on the lens turned out to be an on/off switch for an integrated heating element to prevent condensation on the lens.

Right, would make sense to relate to astrophotography, with high corrections. I guess the used phrasing is too explicit as to have been just a strange translation of "stellar".
However, I'm really looking forward to this lens, well corrected wideangle would have been the only pull factor for me to look at FF, but this could be now the perfect company with my KP.

biz-engineer · 11-04-2017, 12:54 AM

There is a fresh thread about the 25 F4 for 645, it has a similar slop on the side which is for inserting a filter; what a cool feature.

**ffking** · 11-04-2017, 01:04 AM

Originally posted by biz-engineer

There is a fresh thread about the 25 F4 for 645, it has a similar slop on the side which is for inserting a filter; what a cool feature.

interesting if they can do that while retaining AW designation (I know that's covered too, but it's the norm for D* lenses)

OoKU · 11-04-2017, 01:11 AM

Originally posted by JPT

Ooku - I read this two, but I could not understand whether "starlit" is referring to:

A) The fact that it is part of the DA star series, and the high quality that implies
B) The suitability of the lens for taking images of stars
A&B) The writer is doing a kind of word-play on both of the above

I think it is the sky photography.

thibs · 11-04-2017, 02:21 AM

Originally posted by ffking

interesting if they can do that while retaining AW designation (I know that's covered too, but it's the norm for D* lenses)

The DFA/DA645 *25/4 was AW (as any star lens) and had the filter drawer so yes, that's possible.

DA560 also is AW and has a filter drawer.

ogl · 11-04-2017, 02:36 AM

Sigma Art - filter size 77 mm
dimensions 85.4 x 99.9 mm weight 815 g

DFA*50/1.4 is heavier than 815 g and longer than 100 mm....

72 mm filter is the same as Nikkor 58/1.4 G and Canon 50/1.2

**BigMackCam** · 11-04-2017, 03:27 AM - **1 Like**

Originally posted by ogl

DFA*50/1.4 is heavier than 815 g and longer than 100 mm....

The weight will be a result of the number of glass elements and metal components (i.e. "build quality"). The length will be largely dictated by the optical formula.

Those who have a genuine use for this lens won't be concerned about the weight or length

zapp · 11-04-2017, 04:34 AM

Originally posted by BigMackCam

The weight will be a result of the number of glass elements and metal components (i.e. "build quality"). The length will be largely dictated by the optical formula.

Those who have a genuine use for this lens won't be concerned about the weight or length

I have a use for this lens and I am concerned about length, weight and filter diameter. The 85 will be even bigger that is my major concern.
Do we have any clear information about dimensions yet? It looks big.

---------- Post added 04-11-17 at 12:43 PM ----------

Originally posted by photoptimist

Aqueducts! Beautiful pixelshift photos of aqueducts!

(Now I'm pining for the fjords where this lens might be useful.)

Don't forget the roads, pictures of roads.

11-04-2017, 02:21 AM	#1992
thibs Pentaxian Join Date: Jun 2007 Location: Belgium Photos: Albums Posts: 7,001	Originally posted by ffking interesting if they can do that while retaining AW designation (I know that's covered too, but it's the norm for D* lenses) The DFA/DA645 25/4 was AW (as any star lens) and had the filter drawer so yes, that's possible. DA560 also is AW and has a filter drawer. Last edited by thibs; 11-04-2017 at 02:48 AM.*

11-04-2017, 03:27 AM - 1 Like	#1994
BigMackCam Digitiser of Film Join Date: Mar 2010 Location: North East of England Posts: 20,674	Originally posted by ogl DFA50/1.4 is heavier than 815 g and longer than 100 mm.... The weight will be a result of the number of glass elements and metal components (i.e. "build quality"). The length will be largely dictated by the optical formula. Those who have a genuine use for this lens won't be concerned about the weight or length Last edited by BigMackCam; 11-04-2017 at 03:51 AM.*

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11-03-2017, 04:37 PM	#1981
angerdan Pentaxian Join Date: Feb 2015 Photos: Gallery \| Albums Posts: 2,639	It's not a macro lens, since it has been announced as ultra wide angle zoom lens on the roadmap. ALso a macro zoom makes no sense, especially at this short focal length.

11-03-2017, 04:40 PM	#1982
OoKU Pentaxian Join Date: Dec 2015 Posts: 740 Original Poster	yaotomicamera said： I want to sell it as a starlit lens and things with things High resolution and high performance from opening of the diaphragm were also introduced as "starlit lens" High-performance lens in which the point source at the periphery appears as a point In other words, it is expected to be a fabulous lens with extremely reduced aberrations I hear a story that considering the installation of "dew condensation prevention heater" to support it

11-03-2017, 04:47 PM	#1983
RGlasel Site Supporter Join Date: Sep 2013 Location: Saskatoon Photos: Gallery \| Albums Posts: 3,228	Originally posted by OoKU I want to sell it as a starlit lens and things with things "Starlit" I think I understand, but "things with things?" Originally posted by OoKU I hear a story that considering the installation of "dew condensation prevention heater" to support it Perfect, a rear window defroster for my lens( or in Ford Motor Company parlance, electrically heated backlight). Will the metal conducting lines be visible in photos?

11-03-2017, 05:34 PM	#1984
OoKU Pentaxian Join Date: Dec 2015 Posts: 740 Original Poster	Originally posted by RGlasel "Starlit" I think I understand, but "things with things?"Perfect, a rear window defroster for my lens( or in Ford Motor Company parlance, electrically heated backlight). Will the metal conducting lines be visible in photos? Do not mind，it's translate from Japanese by google.

11-03-2017, 07:52 PM	#1985
JPT Pentaxian Join Date: Jan 2012 Location: Tokyo Photos: Gallery Posts: 2,821	Originally posted by OoKU yaotomicamera said： I want to sell it as a starlit lens and things with things High resolution and high performance from opening of the diaphragm were also introduced as "starlit lens" High-performance lens in which the point source at the periphery appears as a point In other words, it is expected to be a fabulous lens with extremely reduced aberrations I hear a story that considering the installation of "dew condensation prevention heater" to support it Ooku - I read this two, but I could not understand whether "starlit" is referring to: A) The fact that it is part of the DA star series, and the high quality that implies B) The suitability of the lens for taking images of stars A&B) The writer is doing a kind of word-play on both of the above

11-03-2017, 08:48 PM	#1986
mee Veteran Member Join Date: May 2010 Posts: 7,403	I think they just mean it is a fast UWA for taking star/nightsky astrophotography.

11-03-2017, 10:46 PM	#1987
JPT Pentaxian Join Date: Jan 2012 Location: Tokyo Photos: Gallery Posts: 2,821	I think you are probably right, and they are positioning this lens as the ideal companion for Astrotracer. In the light of Yaotomi’s comment, it would be very interesting if the mystery switch on the lens turned out to be an on/off switch for an integrated heating element to prevent condensation on the lens.

11-04-2017, 12:24 AM	#1988
MMVIII Pentaxian Join Date: Mar 2008 Location: EU Posts: 1,121	Originally posted by JPT I think you are probably right, and they are positioning this lens as the ideal companion for Astrotracer. In the light of Yaotomi’s comment, it would be very interesting if the mystery switch on the lens turned out to be an on/off switch for an integrated heating element to prevent condensation on the lens. Right, would make sense to relate to astrophotography, with high corrections. I guess the used phrasing is too explicit as to have been just a strange translation of "stellar". However, I'm really looking forward to this lens, well corrected wideangle would have been the only pull factor for me to look at FF, but this could be now the perfect company with my KP.

11-04-2017, 12:54 AM	#1989
biz-engineer Pentaxian Join Date: Feb 2015 Photos: Gallery Posts: 12,232	There is a fresh thread about the 25 F4 for 645, it has a similar slop on the side which is for inserting a filter; what a cool feature.

11-04-2017, 01:04 AM	#1990
ffking Site Supporter Join Date: Nov 2015 Location: Old South Wales Posts: 6,038	Originally posted by biz-engineer There is a fresh thread about the 25 F4 for 645, it has a similar slop on the side which is for inserting a filter; what a cool feature. interesting if they can do that while retaining AW designation (I know that's covered too, but it's the norm for D* lenses)

11-04-2017, 01:11 AM	#1991
OoKU Pentaxian Join Date: Dec 2015 Posts: 740 Original Poster	Originally posted by JPT Ooku - I read this two, but I could not understand whether "starlit" is referring to: A) The fact that it is part of the DA star series, and the high quality that implies B) The suitability of the lens for taking images of stars A&B) The writer is doing a kind of word-play on both of the above I think it is the sky photography.

11-04-2017, 02:36 AM	#1993
ogl Banned Join Date: Dec 2007 Location: Sankt Peterburg Photos: Gallery \| Albums Posts: 8,382	Sigma Art - filter size 77 mm dimensions 85.4 x 99.9 mm weight 815 g DFA*50/1.4 is heavier than 815 g and longer than 100 mm.... 72 mm filter is the same as Nikkor 58/1.4 G and Canon 50/1.2

11-04-2017, 04:34 AM	#1995
zapp Pentaxian Join Date: Jul 2011 Posts: 2,385	Originally posted by BigMackCam The weight will be a result of the number of glass elements and metal components (i.e. "build quality"). The length will be largely dictated by the optical formula. Those who have a genuine use for this lens won't be concerned about the weight or length I have a use for this lens and I am concerned about length, weight and filter diameter. The 85 will be even bigger that is my major concern. Do we have any clear information about dimensions yet? It looks big. ---------- Post added 04-11-17 at 12:43 PM ---------- Originally posted by photoptimist Aqueducts! Beautiful pixelshift photos of aqueducts! (Now I'm pining for the fjords where this lens might be useful.) Don't forget the roads, pictures of roads.