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zantaphia · 04-06-2014, 10:09 AM

Hi!

I was looking at the exif after I've shot some photos with my K-3 and HD-DA 1.4x Rear Converter AW+ FA 100/2.8 Macro. It was reported as: "on 35 mm: 210mm/f4.
I know there is differences in the DoF (APS to FF), but what's your opinion? Could this (APS) combo replicate the mythical FA200/4 Macro, image quality wise?
Or is it impossible to compare the 2 different setups?

**crewl1** · 04-06-2014, 10:42 AM

But isn't it 140mm not 200mm?

Johndav · 04-06-2014, 11:28 AM

Yes but it's 100mm x1.4 (for the teleconverter) then x1.5 (for aps)

---------- Post added 04-06-14 at 07:30 PM ----------

Ah I see what you mean, the FA200mm is the focal length prior to the aps factor calculation

**StigVidar** · 04-06-2014, 11:44 AM

Originally posted by Johndav

Yes but it's 100mm x1.4 (for the teleconverter) then x1.5 (for aps)

---------- Post added 04-06-14 at 07:30 PM ----------

Ah I see what you mean, the FA200mm is the focal length prior to the aps factor calculation

Forget factor multiplications. It's of no use at all. Really.

carrrlangas · 04-06-2014, 09:13 PM

I think the OP expressed correctly. And the combo would in did have the same field of view (5% narrower) and shutter speed at equal aperture and ISO but large DoF compared to 135 format with FA200/4.

Could you post some samples with and without the 1.4x converter shot wide open without applying lens corrections to see what happens with aberrations. I think contrast and sharpness should be comparable between DFA100WR and FA200 wide open.

**StigVidar** · 04-06-2014, 10:31 PM

Originally posted by carrrlangas

I think contrast and sharpness should be comparable between DFA100WR and FA200 wide open.

DFA100 is not even on the same field as FA*200/4 and a converter will not change that.

carrrlangas · 04-06-2014, 10:55 PM

Originally posted by StigVidar

DFA100 is not even on the same field as FA*200/4 and a converter will not change that.

I wouldn´t know. I do not own any of those lenses. But the DFA100WR has newer coatings and is optimized to be used on digital sensors and that is always and advantage. And if the converter is as good as I´ve read so far, I think the combo stands a chance. We´d need someone with both lenses and the adapter to know for sure..

**StigVidar** · 04-06-2014, 11:41 PM

Originally posted by carrrlangas

We´d need someone with both lenses and the adapter to know for sure..

StigVidar - View Profile - PentaxForums.com

04-06-2014, 10:09 AM	#1
zantaphia Veteran Member Join Date: Mar 2011 Location: Klippan, Scania Photos: Gallery \| Albums Posts: 509	HD-DA 1.4x Rear Converter AW+ (D)FA 100/2.8 = FA200/4? Hi! I was looking at the exif after I've shot some photos with my K-3 and HD-DA 1.4x Rear Converter AW+ FA 100/2.8 Macro. It was reported as: "on 35 mm: 210mm/f4. I know there is differences in the DoF (APS to FF), but what's your opinion? Could this (APS) combo replicate the mythical FA200/4 Macro, image quality wise? Or is it impossible to compare the 2 different setups?

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04-06-2014, 10:42 AM	#2
crewl1 Site Supporter Join Date: Jul 2010 Location: Los Angeles, CA Photos: Gallery \| Albums Posts: 9,807	But isn't it 140mm not 200mm?

04-06-2014, 11:28 AM	#3
Johndav Veteran Member Join Date: Jun 2013 Location: Sunny Dun(ny)fermline, Fife Posts: 405	Yes but it's 100mm x1.4 (for the teleconverter) then x1.5 (for aps) ---------- Post added 04-06-14 at 07:30 PM ---------- Ah I see what you mean, the FA200mm is the focal length prior to the aps factor calculation

04-06-2014, 11:44 AM	#4
StigVidar Site Supporter Join Date: Nov 2006 Location: Norway Photos: Gallery \| Albums Posts: 705	Originally posted by Johndav Yes but it's 100mm x1.4 (for the teleconverter) then x1.5 (for aps) ---------- Post added 04-06-14 at 07:30 PM ---------- Ah I see what you mean, the FA200mm is the focal length prior to the aps factor calculation Forget factor multiplications. It's of no use at all. Really.

04-06-2014, 09:13 PM	#5
carrrlangas Veteran Member Join Date: Mar 2012 Location: Joensuu (Finland) Photos: Gallery Posts: 1,761	I think the OP expressed correctly. And the combo would in did have the same field of view (5% narrower) and shutter speed at equal aperture and ISO but large DoF compared to 135 format with FA200/4. Could you post some samples with and without the 1.4x converter shot wide open without applying lens corrections to see what happens with aberrations. I think contrast and sharpness should be comparable between DFA100WR and FA200 wide open.

04-06-2014, 10:31 PM	#6
StigVidar Site Supporter Join Date: Nov 2006 Location: Norway Photos: Gallery \| Albums Posts: 705	Originally posted by carrrlangas I think contrast and sharpness should be comparable between DFA100WR and FA200 wide open. DFA100 is not even on the same field as FA*200/4 and a converter will not change that.

04-06-2014, 10:55 PM	#7
carrrlangas Veteran Member Join Date: Mar 2012 Location: Joensuu (Finland) Photos: Gallery Posts: 1,761	Originally posted by StigVidar DFA100 is not even on the same field as FA*200/4 and a converter will not change that. I wouldn´t know. I do not own any of those lenses. But the DFA100WR has newer coatings and is optimized to be used on digital sensors and that is always and advantage. And if the converter is as good as I´ve read so far, I think the combo stands a chance. We´d need someone with both lenses and the adapter to know for sure..

04-06-2014, 11:41 PM	#8
StigVidar Site Supporter Join Date: Nov 2006 Location: Norway Photos: Gallery \| Albums Posts: 705	Originally posted by carrrlangas We´d need someone with both lenses and the adapter to know for sure.. StigVidar - View Profile - PentaxForums.com

HD-DA 1.4x Rear Converter AW+ (D)FA 100/2.8 = FA200/4?

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