D FA lens with full performance on new K1?

Uncle Pete · 12-15-2015, 04:06 AM

Hi there, does anybody know, if
SMC Pentax-D FA 100mm F2.8 Macro WR

will most likely deliver 24x36mm pics on the new FF sensor?

Thanks and Happy Holiday!

**Rondec** · 12-15-2015, 04:09 AM - **1 Like**

It is a full frame lens and works great on film. No reason why it shouldn't be fully compatible with the new K-1.

rawr · 12-15-2015, 05:54 AM

Yes, it's a full-frame lens.

To back that claim up somewhat, reviews of that lens on for example a K-5 highlight near imperceptible vignetting on APS-C, even wide-open.

Uncle Pete · 12-15-2015, 06:04 AM

I found a most recent publication on Full Frame by PENTAX | RICOH IMAGING

Adam · 12-15-2015, 10:22 AM

Originally posted by Uncle Pete

Hi there, does anybody know, if
SMC Pentax-D FA 100mm F2.8 Macro WR

will most likely deliver 24x36mm pics on the new FF sensor?

Thanks and Happy Holiday!

Yup, it's certainly designed for it.

starbase218 · 12-15-2015, 12:45 PM

Only thing I can think of is that maybe it's not designed to cover 24x36 + the amount that the sensor can move due to SR.

**clackers** · 12-15-2015, 01:15 PM

Originally posted by starbase218

Only thing I can think of is that maybe it's not designed to cover 24x36 + the amount that the sensor can move due to SR.

Has this been a problem for adapted Pentax lenses on the Sony A7 II?

Not that I'm aware of.

**Rondec** · 12-15-2015, 02:52 PM

Here are a couple of flower shots with the DFA 100 macro WR shot on a *ist film camera. The scans aren't great, but it does cover the "full frame."

**RobA_Oz** · 12-15-2015, 03:12 PM

Originally posted by starbase218

Only thing I can think of is that maybe it's not designed to cover 24x36 + the amount that the sensor can move due to SR.

...which possibility of course applies to any pre-digital Pentax lens. However, with this lens, it's probably less of an issue because macro lenses are often used with a tripod, so SR will be switched off.

kooks · 12-15-2015, 04:30 PM

Ricoh/Pentax already said that all K lenses will work... so.. ofcourse this lens will work too, as same as all the other K (crop or not)

pete-tarmigan · 12-15-2015, 07:33 PM - **1 Like**

Originally posted by Uncle Pete

Hi there, does anybody know, if
SMC Pentax-D FA 100mm F2.8 Macro WR

will most likely deliver 24x36mm pics on the new FF sensor?

Thanks and Happy Holiday!

The D FA series is, by definition, designed for 24mm x 36mm, digital sensors. FA = 24mm x 36mm; D = digital.
See:
smc PENTAX-D FA MAKRO 100 mm F2,8 WR - RICOH IMAGING DEUTSCHLAND GmbH

**monochrome** · 12-15-2015, 08:04 PM

Digitalis just responded to me on another thread the K-mount FF lens image circled is +45mm. I don't KNOW that's enough for SR but ........ 36x24.

**RobA_Oz** · 12-15-2015, 08:38 PM

Originally posted by monochrome

Digitalis just responded to me on another thread the K-mount FF lens image circled is +45mm. I don't KNOW that's enough for SR but ........ 36x24.

So, diagonally, that gives a gap of 0.867mm either side, for SR to work within, which I would have thought was plenty of room. Nonetheless, that 45+mm I presume is the throat mask on the K-mount, and the question that's been raised here (ad infinitum) is whether or not every K-mount lens will produce an image circle to match it.

Not a Number · 12-15-2015, 08:38 PM - **1 Like**

The minimum diameter of an image circle to cover a sensor would be the length of the diagonal of the sensor. Using Pythagoras' Theorem the hypotenuse of a right triangle with legs 24 × 36 mm would be ~43.27 mm.

**monochrome** · 12-15-2015, 09:08 PM

See! There you guys go doing all that technical science stuff I was talking about on the other thread. Meh! I just want a Pentax camera that registers the entire image circle of all these lenses I have!!

12-15-2015, 04:06 AM	#1
Uncle Pete Junior Member Join Date: Jul 2013 Location: 70 km South-East of Munich (DE) Photos: Gallery \| Albums Posts: 45	D FA lens with full performance on new K1? Hi there, does anybody know, if SMC Pentax-D FA 100mm F2.8 Macro WR will most likely deliver 24x36mm pics on the new FF sensor? Thanks and Happy Holiday!

12-15-2015, 10:22 AM	#5
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,597	Originally posted by Uncle Pete Hi there, does anybody know, if SMC Pentax-D FA 100mm F2.8 Macro WR will most likely deliver 24x36mm pics on the new FF sensor? Thanks and Happy Holiday! Yup, it's certainly designed for it. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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12-15-2015, 04:09 AM - 1 Like	#2
Rondec Loyal Site Supporter Join Date: Mar 2009 Location: Gladys, Virginia Photos: Gallery Posts: 27,662	It is a full frame lens and works great on film. No reason why it shouldn't be fully compatible with the new K-1.

12-15-2015, 05:54 AM	#3
rawr Veteran Member Join Date: Jun 2009 Posts: 11,913	Yes, it's a full-frame lens. To back that claim up somewhat, reviews of that lens on for example a K-5 highlight near imperceptible vignetting on APS-C, even wide-open.

12-15-2015, 06:04 AM	#4
Uncle Pete Junior Member Join Date: Jul 2013 Location: 70 km South-East of Munich (DE) Photos: Gallery \| Albums Posts: 45 Original Poster	I found a most recent publication on Full Frame by PENTAX \| RICOH IMAGING

12-15-2015, 12:45 PM	#6
starbase218 Inactive Account Join Date: Sep 2009 Location: Planet Earth, Sol system, Milky Way galaxy, Universe Posts: 1,119	Only thing I can think of is that maybe it's not designed to cover 24x36 + the amount that the sensor can move due to SR.

12-15-2015, 01:15 PM	#7
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by starbase218 Only thing I can think of is that maybe it's not designed to cover 24x36 + the amount that the sensor can move due to SR. Has this been a problem for adapted Pentax lenses on the Sony A7 II? Not that I'm aware of.

12-15-2015, 02:52 PM	#8
Rondec Loyal Site Supporter Join Date: Mar 2009 Location: Gladys, Virginia Photos: Gallery Posts: 27,662	Here are a couple of flower shots with the DFA 100 macro WR shot on a *ist film camera. The scans aren't great, but it does cover the "full frame."

12-15-2015, 03:12 PM	#9
RobA_Oz Site Supporter Join Date: Nov 2008 Location: Tasmania, Australia Photos: Gallery Posts: 8,200	Originally posted by starbase218 Only thing I can think of is that maybe it's not designed to cover 24x36 + the amount that the sensor can move due to SR. ...which possibility of course applies to any pre-digital Pentax lens. However, with this lens, it's probably less of an issue because macro lenses are often used with a tripod, so SR will be switched off.

12-15-2015, 04:30 PM	#10
kooks Veteran Member Join Date: Apr 2011 Location: San José, Costa Rica Photos: Albums Posts: 794	Ricoh/Pentax already said that all K lenses will work... so.. ofcourse this lens will work too, as same as all the other K (crop or not)

12-15-2015, 07:33 PM - 1 Like	#11
pete-tarmigan Veteran Member Join Date: Apr 2009 Location: Conception Bay South, New-fun-land Photos: Gallery Posts: 1,272	Originally posted by Uncle Pete Hi there, does anybody know, if SMC Pentax-D FA 100mm F2.8 Macro WR will most likely deliver 24x36mm pics on the new FF sensor? Thanks and Happy Holiday! The D FA series is, by definition, designed for 24mm x 36mm, digital sensors. FA = 24mm x 36mm; D = digital. See: smc PENTAX-D FA MAKRO 100 mm F2,8 WR - RICOH IMAGING DEUTSCHLAND GmbH

12-15-2015, 08:04 PM	#12
monochrome Loyal Site Supporter Join Date: Mar 2008 Location: Working From Home Photos: Gallery \| Albums Posts: 26,276	Digitalis just responded to me on another thread the K-mount FF lens image circled is +45mm. I don't KNOW that's enough for SR but ........ 36x24.

12-15-2015, 08:38 PM	#13
RobA_Oz Site Supporter Join Date: Nov 2008 Location: Tasmania, Australia Photos: Gallery Posts: 8,200	Originally posted by monochrome Digitalis just responded to me on another thread the K-mount FF lens image circled is +45mm. I don't KNOW that's enough for SR but ........ 36x24. So, diagonally, that gives a gap of 0.867mm either side, for SR to work within, which I would have thought was plenty of room. Nonetheless, that 45+mm I presume is the throat mask on the K-mount, and the question that's been raised here (ad infinitum) is whether or not every K-mount lens will produce an image circle to match it.

12-15-2015, 08:38 PM - 1 Like	#14
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	The minimum diameter of an image circle to cover a sensor would be the length of the diagonal of the sensor. Using Pythagoras' Theorem the hypotenuse of a right triangle with legs 24 × 36 mm would be ~43.27 mm.

12-15-2015, 09:08 PM	#15
monochrome Loyal Site Supporter Join Date: Mar 2008 Location: Working From Home Photos: Gallery \| Albums Posts: 26,276	See! There you guys go doing all that technical science stuff I was talking about on the other thread. Meh! I just want a Pentax camera that registers the entire image circle of all these lenses I have!!