Development update regarding the HD PENTAX-D FA★50mmF1.4 SDM AW

Mistral75 · 06-26-2018, 07:28 AM - **1 Like**

Originally posted by OoKU

By the way, the optical formula revealed in early March by asahi man was the right one; same for the picture of the ring-SDM motor.

[IMG]

[/IMG]

Sandy Hancock · 06-26-2018, 07:34 AM

Originally posted by D1N0

Comparison of MTF curves with the Sigma 50mm F1.4 Art lens

Sorry, those graphs mean nothing to me. Is it good or bad for the Pentax?

swanlefitte · 06-26-2018, 08:19 AM - **2 Likes**

This is great news for the forum thread count!

antipattern · 06-26-2018, 08:28 AM

Originally posted by swanlefitte

This is great news for the forum thread count!

That's what I was thinking, too! It's gonna be tight...

**TedH42** · 06-26-2018, 08:45 AM

Should balance out the K-1's weight.

ogl · 06-26-2018, 09:08 AM

The price is 1355 USD ? 148,500円

Mistral75 · 06-26-2018, 09:13 AM - **1 Like**

Originally posted by ogl

The price is 1355 USD ? 148,500円

According to Nokishita Camera, that's a (discounted) street price including VAT (8 per cent. in Japan). In Japan large retail stores and online retailers offer discounts on the RRP from the day of the announcement.

The official announcement should take place tomorrow night at 10pm UTC (Thursday morning in Japan).

D1N0 · 06-26-2018, 09:21 AM - **1 Like**

Originally posted by Sandy Hancock

Sorry, those graphs mean nothing to me. Is it good or bad for the Pentax?

Nikon explains it quite well: What is a lens MTF chart and how do I read it | NIKKOR lens technology from Nikon

It looks like the sigma excels at center sharpness and contrast, while the center of the Pentax is less sharp it has better sharpness across the frame and better contrast across the frame though a steeper drop off at the edges. This is all at F1.4 of course where the edges hardly ever matter.

nzondlo · 06-26-2018, 09:46 AM

Originally posted by D1N0

Nikon explains it quite well: What is a lens MTF chart and how do I read it | NIKKOR lens technology from Nikon

It looks like the sigma excels at center sharpness and contrast, while the center of the Pentax is less sharp it has better sharpness across the frame and better contrast across the frame though a steeper drop off at the edges. This is all at F1.4 of course where the edges hardly ever matter.

Which that's an incredible win for this lens seeing the Art series lenses are known and marketed as having the superior corner-to-corner sharpness in the industry. Also, it looks like the bokeh is going to be much softer, something Pentax lenses like the Limited series were always known for.

CNunez · 06-26-2018, 10:48 AM

Can't wait for this!

**BigDave** · 06-26-2018, 11:21 AM

Originally posted by D1N0

Comparison of MTF curves with the Sigma 50mm F1.4 Art lens:

Pentax top 10=blue bottom 30=red Sigma top 10=red bottom 30=green.

Looking at the graphs D1N0 has for the Sigma and Pentax, they are very much equal, and both should render fine details quite well! Now let's see an 85mm equivalent!

aurele · 06-26-2018, 11:40 AM

heavier than the Sigma 50/1.4, a tad better MTF charts, the Pentax should be gorgeous and massive. I like that !

**Mikesul** · 06-26-2018, 11:40 AM - **3 Likes**

Who cares about Sigma if we get a Pentax * 1.4

pete-tarmigan · 06-26-2018, 11:40 AM

Originally posted by Mistral75

By the way, the optical formula revealed in early March by asahi man was the right one; same for the picture of the ring-SDM motor.

What an astounding number of glass elements for a fixed focal length lens. I guess it's a sign of the times - the demand for edge-to-edge sharpness and minimal aberration.

**gaweidert** · 06-26-2018, 11:52 AM - **1 Like**

Originally posted by pete-tarmigan

What an astounding number of glass elements for a fixed focal length lens. I guess it's a sign of the times - the demand for edge-to-edge sharpness and minimal aberration.

In the digital imaging world. we are asking a lot more out of smaller original images. The film equivalent would be asking a 35mm image to deliver the same level or detail and clarity as a medium or even large format camera. This requires complex lens designs and with complexity comes increased cost.

06-26-2018, 07:28 AM - 1 Like	#421
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	Originally posted by OoKU By the way, the optical formula revealed in early March by *asahi man* was the right one; same for the picture of the ring-SDM motor. [IMG][/IMG]

06-26-2018, 09:46 AM	#429
nzondlo Senior Member Join Date: Jun 2016 Location: Scranton, PA Posts: 186	Originally posted by D1N0 Nikon explains it quite well: What is a lens MTF chart and how do I read it \| NIKKOR lens technology from Nikon It looks like the sigma excels at center sharpness and contrast, while the center of the Pentax is less sharp it has better sharpness across the frame and better contrast across the frame though a steeper drop off at the edges. This is all at F1.4 of course where the edges hardly ever matter. Which that's an incredible win for this lens seeing the Art series lenses are known and marketed as having the superior corner-to-corner sharpness in the industry. Also, it looks like the bokeh is going to be much softer, something Pentax lenses like the Limited series were always known for. Last edited by nzondlo; 06-26-2018 at 09:59 AM.

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06-26-2018, 07:34 AM	#422
Sandy Hancock Moderator Site Supporter Join Date: Feb 2012 Location: Adelaide Hills, South Australia Photos: Gallery \| Albums Posts: 11,275	Originally posted by D1N0 Comparison of MTF curves with the Sigma 50mm F1.4 Art lens Sorry, those graphs mean nothing to me. Is it good or bad for the Pentax?

06-26-2018, 08:19 AM - 2 Likes	#423
swanlefitte Pentaxian Join Date: May 2015 Location: Minneapolis Photos: Gallery Posts: 4,068	This is great news for the forum thread count!

06-26-2018, 08:28 AM	#424
antipattern Senior Member Join Date: Apr 2012 Location: Berlin, Germany Photos: Albums Posts: 232	Originally posted by swanlefitte This is great news for the forum thread count! That's what I was thinking, too! It's gonna be tight...

06-26-2018, 08:45 AM	#425
TedH42 F/8 & Somewhere Join Date: Dec 2011 Location: Colorado Photos: Gallery Posts: 1,412	Should balance out the K-1's weight.

06-26-2018, 09:08 AM	#426
ogl Banned Join Date: Dec 2007 Location: Sankt Peterburg Photos: Gallery \| Albums Posts: 8,382	The price is 1355 USD ? 148,500円

06-26-2018, 09:13 AM - 1 Like	#427
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	Originally posted by ogl The price is 1355 USD ? 148,500円 According to Nokishita Camera, that's a (discounted) street price including VAT (8 per cent. in Japan). In Japan large retail stores and online retailers offer discounts on the RRP from the day of the announcement. The official announcement should take place tomorrow night at 10pm UTC (Thursday morning in Japan).

06-26-2018, 09:21 AM - 1 Like	#428
D1N0 Pentaxian Join Date: May 2012 Location: --- Photos: Gallery Posts: 6,802	Originally posted by Sandy Hancock Sorry, those graphs mean nothing to me. Is it good or bad for the Pentax? Nikon explains it quite well: What is a lens MTF chart and how do I read it \| NIKKOR lens technology from Nikon It looks like the sigma excels at center sharpness and contrast, while the center of the Pentax is less sharp it has better sharpness across the frame and better contrast across the frame though a steeper drop off at the edges. This is all at F1.4 of course where the edges hardly ever matter.

06-26-2018, 10:48 AM	#430
CNunez Senior Member Join Date: Dec 2014 Photos: Gallery Posts: 168	Can't wait for this!

06-26-2018, 11:21 AM	#431
BigDave Site Supporter Join Date: Sep 2010 Location: Hudson Valley, NY Photos: Gallery \| Albums Posts: 2,626	Originally posted by D1N0 Comparison of MTF curves with the Sigma 50mm F1.4 Art lens: Pentax top 10=blue bottom 30=red Sigma top 10=red bottom 30=green. Looking at the graphs D1N0 has for the Sigma and Pentax, they are very much equal, and both should render fine details quite well! Now let's see an 85mm equivalent!

06-26-2018, 11:40 AM	#432
aurele Veteran Member Join Date: Jan 2011 Location: Paris, France Photos: Albums Posts: 3,217	heavier than the Sigma 50/1.4, a tad better MTF charts, the Pentax should be gorgeous and massive. I like that !

06-26-2018, 11:40 AM - 3 Likes	#433
Mikesul Loyal Site Supporter Join Date: Sep 2009 Location: Phoenix, AZ Posts: 7,594	Who cares about Sigma if we get a Pentax * 1.4

06-26-2018, 11:40 AM	#434
pete-tarmigan Veteran Member Join Date: Apr 2009 Location: Conception Bay South, New-fun-land Photos: Gallery Posts: 1,272	Originally posted by Mistral75 By the way, the optical formula revealed in early March by *asahi man* was the right one; same for the picture of the ring-SDM motor. What an astounding number of glass elements for a fixed focal length lens. I guess it's a sign of the times - the demand for edge-to-edge sharpness and minimal aberration.

06-26-2018, 11:52 AM - 1 Like	#435
gaweidert Loyal Site Supporter Join Date: Mar 2012 Location: Rochester, NY Photos: Gallery Posts: 5,327	Originally posted by pete-tarmigan What an astounding number of glass elements for a fixed focal length lens. I guess it's a sign of the times - the demand for edge-to-edge sharpness and minimal aberration. In the digital imaging world. we are asking a lot more out of smaller original images. The film equivalent would be asking a 35mm image to deliver the same level or detail and clarity as a medium or even large format camera. This requires complex lens designs and with complexity comes increased cost.