Angle of view of Pentax 67 35mm Lens

dcarubia · 11-17-2014, 10:54 AM

In the reviews section of this website the Pentax 67 35mm lens is listed as having an angle of view of 180 degrees. Having just bought the lens I can say that this is incorrect.

The horizontal angle of view seems to be more like 90 degrees.

Assuming I'm not missing something (and please let me know if I am), can this be corrected?

**gofour3** · 11-17-2014, 11:32 AM

Originally posted by dcarubia

In the reviews section of this website the Pentax 67 35mm lens is listed as having an angle of view of 180 degrees. Having just bought the lens I can say that this is incorrect.

The horizontal angle of view seems to be more like 90 degrees.

Assuming I'm not missing something (and please let me know if I am), can this be corrected?

That camera are you using the 35/4.5 Fisheye on?

Phil.

desertscape · 11-17-2014, 11:34 AM

The angle is measured across the frame diagonal, not horizontal. If you are using a prism finder, that does not show the entire frame and can look like it is not as wide as advertised. Remember that when focusing closer than infinity, that will narrow the field somewhat too.

dcarubia · 11-17-2014, 11:36 AM

I'm using it on a Pentax 67ii. Angle of view should be 90 degrees.

---------- Post added 11-17-14 at 01:41 PM ----------

Diagonally, angle of view is about 103 degrees. I found that out here: Rui Salgueiro's field-of-view calculator

**gofour3** · 11-17-2014, 11:47 AM

As "desertscape" indicated, it's how the angle is measured.

This is from a Pentax 6x7 brochure:

Phil.

desertscape · 11-17-2014, 11:49 AM

Traditional field of view calculators do not work with fisheye lenses. I owned this lens for a few years and did a test to see how wide it was and found it was 160 degrees at close focus and close to 180 at infinity.

dcarubia · 11-17-2014, 11:53 AM

Originally posted by desertscape

The angle is measured across the frame diagonal, not horizontal. If you are using a prism finder, that does not show the entire frame and can look like it is not as wide as advertised. Remember that when focusing closer than infinity, that will narrow the field somewhat too.

Going from 90 degrees to 180 degrees is a huge variance. I don't think the finders used and focusing point is enough to account for that.

**gofour3** · 11-17-2014, 11:56 AM

Originally posted by dcarubia

I don't think the finders used and focusing point is enough to account for that.

If you are using the AE 67ii metered prism it only covers 90% of the viewing area, the wlf finders cover 100%.

Phil.

dcarubia · 11-17-2014, 12:00 PM

Originally posted by desertscape

Traditional field of view calculators do not work with fisheye lenses. I owned this lens for a few years and did a test to see how wide it was and found it was 160 degrees at close focus and close to 180 at infinity.

Ahhh.... I guess that's what I was missing! I looked that up and it seems you are correct re: calculators. I haven't had a chance to play with this lens outdoors yet, so I haven't done any outdoor tests yet. Thanks for the info...

stevebrot · 11-17-2014, 12:04 PM

I feel stupid jumping in here since I do not own a 6x7. On the other hand, I do frequently shoot 180 degree diagonal fisheye on 35mm film. If you doubt the 180 degrees, simply put the camera level on tripod in vertical orientation and notice that it is fiendishly difficult to keep the tripod legs out of the frame.

Steve

desertscape · 11-17-2014, 12:16 PM

Many of the scenes I was shooting, I used the hyperfocal settings on the DOF scale and so the angle of view was in the 170 degree range.

**gofour3** · 11-18-2014, 11:50 AM

Originally posted by stevebrot

simply put the camera level on tripod in vertical orientation and notice that it is fiendishly difficult to keep the tripod legs out of the frame.

The 6x7 35/4.5 fisheye is not as bad as the smaller K17/4 that I also own.
The 6x7 lens is so much bigger, as well as the camera body, that they both stick out far enough as to not have the tripod leg issue.

Phil.

stevebrot · 11-18-2014, 11:53 AM

Originally posted by gofour3

The 6x7 lens is so much bigger, as well as the camera body, that they both stick out far enough as to not have the tripod leg issue.

Ha! Ha! I use the tiny Zenitar and get almost the entire tripod leg in the photo!

Steve

**gofour3** · 11-18-2014, 11:55 AM

Originally posted by stevebrot

Ha! Ha! I use the tiny Zenitar and get almost the entire tripod leg in the photo!

Steve

Yep I have the same issue with the K17/4, every few shots seem to have a finger or other body part in the frame when handholding the camera!

Phil.

11-17-2014, 10:54 AM	#1
dcarubia New Member Join Date: Nov 2014 Posts: 4	Angle of view of Pentax 67 35mm Lens In the reviews section of this website the Pentax 67 35mm lens is listed as having an angle of view of 180 degrees. Having just bought the lens I can say that this is incorrect. The horizontal angle of view seems to be more like 90 degrees. Assuming I'm not missing something (and please let me know if I am), can this be corrected?

11-17-2014, 11:34 AM	#3
desertscape Pentaxian Join Date: Feb 2009 Location: Arizona Posts: 1,272	The angle is measured across the frame diagonal, not horizontal. If you are using a prism finder, that does not show the entire frame and can look like it is not as wide as advertised. Remember that when focusing closer than infinity, that will narrow the field somewhat too. Last edited by desertscape; 11-17-2014 at 11:50 AM.

11-17-2014, 11:47 AM	#5
gofour3 Site Supporter Join Date: Oct 2008 Location: Vancouver, Canada Posts: 8,090	As "desertscape" indicated, it's how the angle is measured. This is from a Pentax 6x7 brochure: Phil. Attached Images

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11-17-2014, 11:32 AM	#2
gofour3 Site Supporter Join Date: Oct 2008 Location: Vancouver, Canada Posts: 8,090	Originally posted by dcarubia In the reviews section of this website the Pentax 67 35mm lens is listed as having an angle of view of 180 degrees. Having just bought the lens I can say that this is incorrect. The horizontal angle of view seems to be more like 90 degrees. Assuming I'm not missing something (and please let me know if I am), can this be corrected? That camera are you using the 35/4.5 Fisheye on? Phil.

11-17-2014, 11:36 AM	#4
dcarubia New Member Join Date: Nov 2014 Posts: 4 Original Poster	I'm using it on a Pentax 67ii. Angle of view should be 90 degrees. ---------- Post added 11-17-14 at 01:41 PM ---------- Diagonally, angle of view is about 103 degrees. I found that out here: Rui Salgueiro's field-of-view calculator

11-17-2014, 11:49 AM	#6
desertscape Pentaxian Join Date: Feb 2009 Location: Arizona Posts: 1,272	Traditional field of view calculators do not work with fisheye lenses. I owned this lens for a few years and did a test to see how wide it was and found it was 160 degrees at close focus and close to 180 at infinity.

11-17-2014, 11:53 AM	#7
dcarubia New Member Join Date: Nov 2014 Posts: 4 Original Poster	Originally posted by desertscape The angle is measured across the frame diagonal, not horizontal. If you are using a prism finder, that does not show the entire frame and can look like it is not as wide as advertised. Remember that when focusing closer than infinity, that will narrow the field somewhat too. Going from 90 degrees to 180 degrees is a huge variance. I don't think the finders used and focusing point is enough to account for that.

11-17-2014, 11:56 AM	#8
gofour3 Site Supporter Join Date: Oct 2008 Location: Vancouver, Canada Posts: 8,090	Originally posted by dcarubia I don't think the finders used and focusing point is enough to account for that. If you are using the AE 67ii metered prism it only covers 90% of the viewing area, the wlf finders cover 100%. Phil.

11-17-2014, 12:00 PM	#9
dcarubia New Member Join Date: Nov 2014 Posts: 4 Original Poster	Originally posted by desertscape Traditional field of view calculators do not work with fisheye lenses. I owned this lens for a few years and did a test to see how wide it was and found it was 160 degrees at close focus and close to 180 at infinity. Ahhh.... I guess that's what I was missing! I looked that up and it seems you are correct re: calculators. I haven't had a chance to play with this lens outdoors yet, so I haven't done any outdoor tests yet. Thanks for the info...

11-17-2014, 12:04 PM	#10
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	I feel stupid jumping in here since I do not own a 6x7. On the other hand, I do frequently shoot 180 degree diagonal fisheye on 35mm film. If you doubt the 180 degrees, simply put the camera level on tripod in vertical orientation and notice that it is fiendishly difficult to keep the tripod legs out of the frame. Steve

11-17-2014, 12:16 PM	#11
desertscape Pentaxian Join Date: Feb 2009 Location: Arizona Posts: 1,272	Many of the scenes I was shooting, I used the hyperfocal settings on the DOF scale and so the angle of view was in the 170 degree range.

11-18-2014, 11:50 AM	#12
gofour3 Site Supporter Join Date: Oct 2008 Location: Vancouver, Canada Posts: 8,090	Originally posted by stevebrot simply put the camera level on tripod in vertical orientation and notice that it is fiendishly difficult to keep the tripod legs out of the frame. The 6x7 35/4.5 fisheye is not as bad as the smaller K17/4 that I also own. The 6x7 lens is so much bigger, as well as the camera body, that they both stick out far enough as to not have the tripod leg issue. Phil.

11-18-2014, 11:53 AM	#13
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by gofour3 The 6x7 lens is so much bigger, as well as the camera body, that they both stick out far enough as to not have the tripod leg issue. Ha! Ha! I use the tiny Zenitar and get almost the entire tripod leg in the photo! Steve

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11-18-2014, 11:55 AM	#14
gofour3 Site Supporter Join Date: Oct 2008 Location: Vancouver, Canada Posts: 8,090	Originally posted by stevebrot Ha! Ha! I use the tiny Zenitar and get almost the entire tripod leg in the photo! Steve Yep I have the same issue with the K17/4, every few shots seem to have a finger or other body part in the frame when handholding the camera! Phil.