Which has the shallower DOF DA70mm 2.4 or FA50mm 1.4?

rustynail925 · 04-16-2010, 12:24 PM

Which has the shallower DOF
DA70 2.4 or FA50 1.4?

séamuis · 04-16-2010, 12:33 PM

Originally posted by rustynail925

Which has the shallower DOF
DA70 2.4 or FA50 1.4?

depends on aperture used, focal length and focus distance. its not quite as easy as just saying '1.4 is wider so gives a more shallow depth of field.'

here is just but one of many useful sites for understanding this.

Understanding Depth of Field in Photography

rustynail925 · 04-16-2010, 12:35 PM

Which can attain the shallower dof
da70 @2.4 or fa50 @1.4
at their minimum focusing distance

séamuis · 04-16-2010, 12:40 PM

Originally posted by rustynail925

Which can attain the shallower dof
da70 @2.4 or fa50 @1.4
at their minimum focusing distance

the FA 50, but the difference is rather miniscule (probably not enough for you to see any real difference) you can use the handy calculator right on that page to determine this (or close to it since it doesn't have a 2.4 selection) thats what I did.

Eruditass · 04-16-2010, 01:09 PM

When at MFD:
FA 50 1.4 @ 45cm: 0.41 cm
DA70 2.4 @ 70cm: 0.86 cm

When subject is at same distance
FA 50 1.4 @ 70cm: 1.03 cm
DA70 2.4 @ 70cm: 0.86 cm

Keep in mind perspective distortions and different mangifications due to different focal lengths. For the same framing, the DA70 will allow you to be further away, and compress what x cm looks like. For the same subject distance, the DA70 will magnify the image.

To get extremely shallow DoF, just pick up an extension tube.

Pentaxor · 04-16-2010, 02:07 PM

Originally posted by Eruditass

When at MFD:
FA 50 1.4 @ 45cm: 0.41 cm
DA70 2.4 @ 70cm: 0.86 cm

When subject is at same distance
FA 50 1.4 @ 70cm: 1.03 cm
DA70 2.4 @ 70cm: 0.86 cm

Keep in mind perspective distortions and different mangifications due to different focal lengths. For the same framing, the DA70 will allow you to be further away, and compress what x cm looks like. For the same subject distance, the DA70 will magnify the image.

To get extremely shallow DoF, just pick up an extension tube.

and prepare to compensate for lighting as well.

newarts · 04-16-2010, 03:15 PM

do you want the same size image on the sensor?

if so, the answer may differ.

aleonx3 · 04-16-2010, 03:39 PM

The answer depends on which one of the two paramters, distance from the subject and field of view when you compare the two. If you keep the same distance, the DA70mm 2.4 gives slight shallow DOF of around 7.5 inches, if you keep the same field of view (by moving the subject distance), then 50mm 1.4 gives slightly shallow DOF of around 8 inches.

rustynail925 · 04-16-2010, 11:05 PM

Thank you all for the help

brecklundin · 04-17-2010, 05:41 AM

Originally posted by rustynail925

Which has the shallower DOF
DA70 2.4 or FA50 1.4?

Online Depth of Field Calculator

04-16-2010, 12:24 PM	#1
rustynail925 Veteran Member Join Date: Aug 2009 Location: Philippines Photos: Gallery Posts: 1,551	Which has the shallower DOF DA70mm 2.4 or FA50mm 1.4? Which has the shallower DOF DA70 2.4 or FA50 1.4?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Wanted - Acquired: DA70mm or DA 17-70mm	kleung	Sold Items	1	03-22-2010 02:23 PM
FA77mm or DA70mm and DA35mm	TheTenaciousOne	Pentax SLR Lens Discussion	36	09-03-2009 07:18 AM
For Sale - Sold: DA70mm	reknelb	Sold Items	1	05-08-2009 05:48 AM
For Sale - Sold: DA40MM and DA70MM	jeffelias	Sold Items	5	01-15-2009 02:00 PM

04-16-2010, 12:33 PM	#2
séamuis Banned Join Date: Oct 2007 Location: Savannah, U.S./Baguio City, P.H. Posts: 5,979	Originally posted by rustynail925 Which has the shallower DOF DA70 2.4 or FA50 1.4? depends on aperture used, focal length and focus distance. its not quite as easy as just saying '1.4 is wider so gives a more shallow depth of field.' here is just but one of many useful sites for understanding this. Understanding Depth of Field in Photography

04-16-2010, 12:35 PM	#3
rustynail925 Veteran Member Join Date: Aug 2009 Location: Philippines Photos: Gallery Posts: 1,551 Original Poster	Which can attain the shallower dof da70 @2.4 or fa50 @1.4 at their minimum focusing distance

04-16-2010, 12:40 PM	#4
séamuis Banned Join Date: Oct 2007 Location: Savannah, U.S./Baguio City, P.H. Posts: 5,979	Originally posted by rustynail925 Which can attain the shallower dof da70 @2.4 or fa50 @1.4 at their minimum focusing distance the FA 50, but the difference is rather miniscule (probably not enough for you to see any real difference) you can use the handy calculator right on that page to determine this (or close to it since it doesn't have a 2.4 selection) thats what I did.

04-16-2010, 01:09 PM	#5
Eruditass Veteran Member Join Date: Jul 2009 Photos: Gallery Posts: 2,207	When at MFD: FA 50 1.4 @ 45cm: 0.41 cm DA70 2.4 @ 70cm: 0.86 cm When subject is at same distance FA 50 1.4 @ 70cm: 1.03 cm DA70 2.4 @ 70cm: 0.86 cm Keep in mind perspective distortions and different mangifications due to different focal lengths. For the same framing, the DA70 will allow you to be further away, and compress what x cm looks like. For the same subject distance, the DA70 will magnify the image. To get extremely shallow DoF, just pick up an extension tube.

04-16-2010, 02:07 PM	#6
Pentaxor Veteran Member Join Date: May 2009 Location: Vancouver, B.C. Photos: Gallery Posts: 6,513	Originally posted by Eruditass When at MFD: FA 50 1.4 @ 45cm: 0.41 cm DA70 2.4 @ 70cm: 0.86 cm When subject is at same distance FA 50 1.4 @ 70cm: 1.03 cm DA70 2.4 @ 70cm: 0.86 cm Keep in mind perspective distortions and different mangifications due to different focal lengths. For the same framing, the DA70 will allow you to be further away, and compress what x cm looks like. For the same subject distance, the DA70 will magnify the image. To get extremely shallow DoF, just pick up an extension tube. and prepare to compensate for lighting as well.

04-16-2010, 03:15 PM	#7
newarts Inactive Account Join Date: Dec 2008 Location: Ames, Iowa, USA Photos: Albums Posts: 2,965	do you want the same size image on the sensor? if so, the answer may differ.

04-16-2010, 03:39 PM	#8
aleonx3 Veteran Member Join Date: Jul 2007 Location: Brampton, Ontario Photos: Gallery \| Albums Posts: 3,996	The answer depends on which one of the two paramters, distance from the subject and field of view when you compare the two. If you keep the same distance, the DA70mm 2.4 gives slight shallow DOF of around 7.5 inches, if you keep the same field of view (by moving the subject distance), then 50mm 1.4 gives slightly shallow DOF of around 8 inches.

04-16-2010, 11:05 PM	#9
rustynail925 Veteran Member Join Date: Aug 2009 Location: Philippines Photos: Gallery Posts: 1,551 Original Poster	Thank you all for the help

04-17-2010, 05:41 AM	#10
brecklundin Veteran Member Join Date: Jun 2009 Photos: Albums Posts: 1,674	Originally posted by rustynail925 Which has the shallower DOF DA70 2.4 or FA50 1.4? Online Depth of Field Calculator