HD PENTAX-D FA ★ 70-200mm F2.8 at 5th February?

kenspo · 03-31-2015, 02:12 AM

Originally posted by Cynog Ap Brychan

What I would like to know is whether the 70-200 focus breathes like the Nikon, or does it more resemble the Canon in this respect?

You mean noisy? You can't almost here it works at all..almost total silence.

Cynog Ap Brychan · 03-31-2015, 02:18 AM

Originally posted by kenspo

You mean noisy? You can't almost here it works at all..almost total silence.

No, I mean the fact that the Nikon's focal length shortens considerably at the 200 mm end when it is focused on close subjects (it becomes closer to 120 mm). The Canon maintains its focal length much better, according to Tony Northrup.

kenspo · 03-31-2015, 02:36 AM

Originally posted by Cynog Ap Brychan

No, I mean the fact that the Nikon's focal length shortens considerably at the 200 mm end when it is focused on close subjects (it becomes closer to 120 mm). The Canon maintains its focal length much better, according to Tony Northrup.

Sorry, not enough coffee yet

That kind of testing i haven't done yet. But will do

rawr · 03-31-2015, 02:50 AM

Originally posted by kenspo

200, 300, 70-200 and 150-450 side by side without hood on

Wow. The big boys from Pentax look formidable. Poor old DA*300 is dwarfed.

Out of curiosity, do you have your old Nikon 70-200 around, just to see how it looks against the 70-200 Pentax?

kenspo · 03-31-2015, 02:53 AM

Originally posted by rawr

Wow. The big boys from Pentax look formidable. Poor old DA*300 is dwarfed.

Out of curiosity, do you have your old Nikon 70-200 around, just to see how it looks against the 70-200 Pentax?

hehe..yes, the 300 is small on the side of these big boys

No, sorry..i sold everything Nikon when i signed for Ricoh! But can see if i can do it when i see some of my colleagues

aurele · 03-31-2015, 04:04 AM - **1 Like**

Originally posted by monochrome

BMC isn't a good gauge of currency equivalency. Article on The Big Mac Index from The Economist.

As stated it's a "simple way of comparing things". No, it's not accurate, yes it's fun, and no it doesn't have real economic value, but who really cares when we talk about lenses and burger ?

bhairavp · 03-31-2015, 04:22 AM

I have the older 70-200 from Nikon, it doesn't have the focus breathing issue. The newer one is better on full frame though.

Winder · 03-31-2015, 05:28 AM

Originally posted by bhairavp

I have the older 70-200 from Nikon, it doesn't have the focus breathing issue. The newer one is better on full frame though.

The newer Nikon does have focus breathing issues. As you zoom in to 200mm the minimum focus distance increases and you basically end up with a 135mm lens instead of a 200mm because you have to step back.

Originally posted by Cynog Ap Brychan

What I would like to know is whether the 70-200 focus breathes like the Nikon, or does it more resemble the Canon in this respect?

According to a couple of people the Pentax does not breathe as you zoom in.

bhairavp · 03-31-2015, 06:18 AM

yep, I know. I have the VR1,which doesn't have the focus breathing issue. I shoot DX, so the corners on fx are not relevant.

HavelockV · 03-31-2015, 09:34 AM

Honestly this "Focus breathing" is a non issue if the lens has got the right magnification, as the key question is what do you want to achieve?

The old Nikkor das have relatively little focus breathing (it is actually 177mm at the nfd), but that doesnt help it much with the nfd being a clumsy 1,5m for this short tele reach.

Usually People want magnification. This is where the old great Tamron 70-200 shines with x0,32 versus x0,16 of the old Nikkor (and x0,12 of the new one).

The DFA is 122mm at the nfd with a max magnification of x0,13 (the actual focal length can be calculated quite easily).

The real sucker here is the new Sony FE 70-200 with a mere 108mm remaining at nfd (and a magn. of x0,13).

Nicolas06 · 03-31-2015, 12:33 PM

Originally posted by Stavri

The MTF curve on the pentax 70-200 shows better performance than the Nikon/Canon equivalents, but that looks to be measured on the Aps-C from the nature of the curve. On FF he falloff should be greater. The camera sensor plays a role on the mapping of said performance. Pitting the K3 vs D810 is not an optimal comparison, we have to wait for the FF to truly know which is the best optically.

I think that FF both side. Both graph show distance in mm and both stop a 20mm from center.

fuent104 · 03-31-2015, 10:01 PM

Originally posted by HavelockV

Honestly this "Focus breathing" is a non issue if the lens has got the right magnification, as the key question is what do you want to achieve?

The old Nikkor das have relatively little focus breathing (it is actually 177mm at the nfd), but that doesnt help it much with the nfd being a clumsy 1,5m for this short tele reach.

Usually People want magnification. This is where the old great Tamron 70-200 shines with x0,32 versus x0,16 of the old Nikkor (and x0,12 of the new one).

The DFA is 122mm at the nfd with a max magnification of x0,13 (the actual focal length can be calculated quite easily).

The real sucker here is the new Sony FE 70-200 with a mere 108mm remaining at nfd (and a magn. of x0,13).

Focus breathing is a big issue for shooting video. If a lens breathes while you pull focus, it can be very distracting and very noticeable. It could, in fact, be a deal breaker if it is bad enough.

**vcollerp** · 03-31-2015, 10:52 PM

Did not see this posted here. A link NedB posted on DPR. Looking good.

https://instagram.com/p/0lebpPBrsg/

rawr · 04-01-2015, 12:14 AM - **1 Like**

Originally posted by vcollerp

A link NedB posted on DPR. Looking good.

It looks OK, I guess. But, while I don't want to sound negative, at f7 (plus using lots of flash), any 70-200mm lens on the planet would probably be good enough to resolve a few dark eye-lashes near the centre of the frame at 3 metres.

jaad75 · 04-01-2015, 12:45 AM

Originally posted by Stavri

The MTF curve on the pentax 70-200 shows better performance than the Nikon/Canon equivalents, but that looks to be measured on the Aps-C from the nature of the curve. On FF he falloff should be greater. The camera sensor plays a role on the mapping of said performance. Pitting the K3 vs D810 is not an optimal comparison, we have to wait for the FF to truly know which is the best optically.

You can see the image circle radius on the bottom of the chart...

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03-31-2015, 02:12 AM	#496
kenspo Veteran Member Join Date: Mar 2014 Location: Oslo Posts: 2,207	Originally posted by Cynog Ap Brychan What I would like to know is whether the 70-200 focus breathes like the Nikon, or does it more resemble the Canon in this respect? You mean noisy? You can't almost here it works at all..almost total silence.

03-31-2015, 02:18 AM	#497
Cynog Ap Brychan Veteran Member Join Date: Sep 2012 Location: Gloucester Photos: Gallery Posts: 1,199	Originally posted by kenspo You mean noisy? You can't almost here it works at all..almost total silence. No, I mean the fact that the Nikon's focal length shortens considerably at the 200 mm end when it is focused on close subjects (it becomes closer to 120 mm). The Canon maintains its focal length much better, according to Tony Northrup.

03-31-2015, 02:36 AM	#498
kenspo Veteran Member Join Date: Mar 2014 Location: Oslo Posts: 2,207	Originally posted by Cynog Ap Brychan No, I mean the fact that the Nikon's focal length shortens considerably at the 200 mm end when it is focused on close subjects (it becomes closer to 120 mm). The Canon maintains its focal length much better, according to Tony Northrup. Sorry, not enough coffee yet That kind of testing i haven't done yet. But will do

03-31-2015, 02:50 AM	#499
rawr Veteran Member Join Date: Jun 2009 Posts: 11,913	Originally posted by kenspo 200, 300, 70-200 and 150-450 side by side without hood on Wow. The big boys from Pentax look formidable. Poor old DA*300 is dwarfed. Out of curiosity, do you have your old Nikon 70-200 around, just to see how it looks against the 70-200 Pentax?

03-31-2015, 02:53 AM	#500
kenspo Veteran Member Join Date: Mar 2014 Location: Oslo Posts: 2,207	Originally posted by rawr Wow. The big boys from Pentax look formidable. Poor old DA*300 is dwarfed. Out of curiosity, do you have your old Nikon 70-200 around, just to see how it looks against the 70-200 Pentax? hehe..yes, the 300 is small on the side of these big boys No, sorry..i sold everything Nikon when i signed for Ricoh! But can see if i can do it when i see some of my colleagues

03-31-2015, 04:04 AM - 1 Like	#501
aurele Veteran Member Join Date: Jan 2011 Location: Paris, France Photos: Albums Posts: 3,217	Originally posted by monochrome BMC isn't a good gauge of currency equivalency. Article on The Big Mac Index from The Economist. As stated it's a "simple way of comparing things". No, it's not accurate, yes it's fun, and no it doesn't have real economic value, but who really cares when we talk about lenses and burger ?

03-31-2015, 04:22 AM	#502
bhairavp Veteran Member Join Date: Jan 2010 Location: Mumbai, India Posts: 399	I have the older 70-200 from Nikon, it doesn't have the focus breathing issue. The newer one is better on full frame though.

03-31-2015, 05:28 AM	#503
Winder Veteran Member Join Date: Apr 2010 Location: Tennessee Posts: 6,617	Originally posted by bhairavp I have the older 70-200 from Nikon, it doesn't have the focus breathing issue. The newer one is better on full frame though. The newer Nikon does have focus breathing issues. As you zoom in to 200mm the minimum focus distance increases and you basically end up with a 135mm lens instead of a 200mm because you have to step back. Originally posted by Cynog Ap Brychan What I would like to know is whether the 70-200 focus breathes like the Nikon, or does it more resemble the Canon in this respect? According to a couple of people the Pentax does not breathe as you zoom in.

03-31-2015, 06:18 AM	#504
bhairavp Veteran Member Join Date: Jan 2010 Location: Mumbai, India Posts: 399	yep, I know. I have the VR1,which doesn't have the focus breathing issue. I shoot DX, so the corners on fx are not relevant.

03-31-2015, 09:34 AM	#505
HavelockV Guest	Honestly this "Focus breathing" is a non issue if the lens has got the right magnification, as the key question is what do you want to achieve? The old Nikkor das have relatively little focus breathing (it is actually 177mm at the nfd), but that doesnt help it much with the nfd being a clumsy 1,5m for this short tele reach. Usually People want magnification. This is where the old great Tamron 70-200 shines with x0,32 versus x0,16 of the old Nikkor (and x0,12 of the new one). The DFA is 122mm at the nfd with a max magnification of x0,13 (the actual focal length can be calculated quite easily). The real sucker here is the new Sony FE 70-200 with a mere 108mm remaining at nfd (and a magn. of x0,13).

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03-31-2015, 12:33 PM	#506
Nicolas06 Veteran Member Join Date: Nov 2013 Posts: 4,854	Originally posted by Stavri The MTF curve on the pentax 70-200 shows better performance than the Nikon/Canon equivalents, but that looks to be measured on the Aps-C from the nature of the curve. On FF he falloff should be greater. The camera sensor plays a role on the mapping of said performance. Pitting the K3 vs D810 is not an optimal comparison, we have to wait for the FF to truly know which is the best optically. I think that FF both side. Both graph show distance in mm and both stop a 20mm from center.

03-31-2015, 10:01 PM	#507
fuent104 Veteran Member Join Date: Apr 2011 Location: California Photos: Gallery Posts: 1,356	Originally posted by HavelockV Honestly this "Focus breathing" is a non issue if the lens has got the right magnification, as the key question is what do you want to achieve? The old Nikkor das have relatively little focus breathing (it is actually 177mm at the nfd), but that doesnt help it much with the nfd being a clumsy 1,5m for this short tele reach. Usually People want magnification. This is where the old great Tamron 70-200 shines with x0,32 versus x0,16 of the old Nikkor (and x0,12 of the new one). The DFA is 122mm at the nfd with a max magnification of x0,13 (the actual focal length can be calculated quite easily). The real sucker here is the new Sony FE 70-200 with a mere 108mm remaining at nfd (and a magn. of x0,13). Focus breathing is a big issue for shooting video. If a lens breathes while you pull focus, it can be very distracting and very noticeable. It could, in fact, be a deal breaker if it is bad enough.

03-31-2015, 10:52 PM	#508
vcollerp Site Supporter Join Date: Dec 2011 Location: Vereeniging South Africa Posts: 208	Did not see this posted here. A link NedB posted on DPR. Looking good. https://instagram.com/p/0lebpPBrsg/

04-01-2015, 12:14 AM - 1 Like	#509
rawr Veteran Member Join Date: Jun 2009 Posts: 11,913	Originally posted by vcollerp A link NedB posted on DPR. Looking good. It looks OK, I guess. But, while I don't want to sound negative, at f7 (plus using lots of flash), any 70-200mm lens on the planet would probably be good enough to resolve a few dark eye-lashes near the centre of the frame at 3 metres.

04-01-2015, 12:45 AM	#510
jaad75 Veteran Member Join Date: Sep 2007 Location: Cracow Posts: 457	Originally posted by Stavri The MTF curve on the pentax 70-200 shows better performance than the Nikon/Canon equivalents, but that looks to be measured on the Aps-C from the nature of the curve. On FF he falloff should be greater. The camera sensor plays a role on the mapping of said performance. Pitting the K3 vs D810 is not an optimal comparison, we have to wait for the FF to truly know which is the best optically. You can see the image circle radius on the bottom of the chart...