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10-30-2011, 08:55 AM   #1
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Samyang / Rokinon 14mm: Angle of View on APS-C

Hello fellow Pentaxians!

I'm planning to purchase a Samyang / Rokinon 14mm f/2.8 lens. I'm really confused if how wide the 14mm on APS-C sensor. On FF sensor, it's really wide, and I know how wide a 14mm on FF especially when I tested my friend's D700 with 14-24mm. I saw some sample shots taken with APS-C cameras, but I still don't get it how wide it is.
Can anyone give or make a comparison between 18-55mm @ 18mm with Samyang 14mm? As much as possible, comparing those two focal lengths on the same APS-C camera and the same subject. hehe.
I plan to purchase this 14mm lens because I also intend to use it on my old film SLR.
Thank you in advance!

10-30-2011, 09:11 AM   #2
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Use this tool to get an idea:
Focal length comparison tool, Tamron USA
Select "Tamron 10-24," then move the mouse cursor from 14 to 18mm. Note that you have three pics on which you can see the difference.

14mm is much wider than 18mm. Also, the Samyang is much, much sharper than the kit lens at any aperture. I've recently posted a thread with pics taken with this lens: https://www.pentaxforums.com/forums/post-your-photos/163493-cityscape-wide-fall.html

Just took a look at your site: fabulous pics!

Last edited by causey; 10-30-2011 at 09:20 AM.
10-30-2011, 09:12 AM   #3
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If you used the 14 on a full frame body, to get the same FOV on digital would require about 9mm. This is especially true since the lens actually works out to 13.5 mm. (this is why Vivitar for example actually sells it as a 13mm).

It is a nice lens and if you really want to use it wide, just pick up a pentax film body. The difference between 14 and 18 mm however is considerable. If you do a search on the forum somewhere thee is a FOV comparison for wide angle

check this link


https://www.pentaxforums.com/forums/pentax-beginners-corner-q/146685-lens-fie...ml#post1532838

Last edited by Lowell Goudge; 10-30-2011 at 09:30 AM.
10-30-2011, 11:27 AM   #4
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do you have a 20 or a 21 for your film camera? That's about what it would be.

10-30-2011, 11:39 AM   #5
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10mm lens: APS-C AOV= 113 deg
14mm lens: FF AOV= 114 deg, APS-C AOV= 94 deg
21mm lens: FF AOV= 92 deg

Or so my spreadsheet tells me. Exact number of degrees may vary slightly depending on the exact sensor size.
10-30-2011, 05:07 PM   #6
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QuoteOriginally posted by causey Quote
Use this tool to get an idea:
Focal length comparison tool, Tamron USA
Select "Tamron 10-24," then move the mouse cursor from 14 to 18mm. Note that you have three pics on which you can see the difference.

14mm is much wider than 18mm. Also, the Samyang is much, much sharper than the kit lens at any aperture. I've recently posted a thread with pics taken with this lens: Wide on the Fall

Just took a look at your site: fabulous pics!
Thank you man for the tool! That's helpful.. Yeah, many are saying that it is really sharp all the way around. =)

QuoteOriginally posted by Lowell Goudge Quote
The difference between 14 and 18 mm however is considerable. If you do a search on the forum somewhere thee is a FOV comparison for wide angle
I think I've read somewhere those comparison. I think they compared three UWA, Sigma 10-20mm, Samyang 14mm, and Pentax 12-24mm. They're almost have the same FOV, but the question is what camera did they use on the Samyang 14mm to compare it with those two UWAs. =)

QuoteOriginally posted by kenafein Quote
do you have a 20 or a 21 for your film camera? That's about what it would be.
Hmmm... That's another problem for me, 28mm is my widest for FF. hehe. =)

QuoteOriginally posted by RioRico Quote
10mm lens: APS-C AOV= 113 deg
14mm lens: FF AOV= 114 deg, APS-C AOV= 94 deg
21mm lens: FF AOV= 92 deg

Or so my spreadsheet tells me. Exact number of degrees may vary slightly depending on the exact sensor size.
Thank you man for the chart! Now I'm getting the idea on how wide the Samyang 14mm on an APS-C sensor (Pentax DSLR sensor). Hmmm... So the Samyang 14mm's AOV on APS-C is 94 deg, and the Pentax DA 14mm's AOV is 92 deg (according from the description at Pentax lens database), that means the Samyang's 14mm is a bit wider comparing with Pentax's DA 14mm...? =)

Man! If only I have the opportunity to test that lens itself in the field, I would not be confused. There's no shop here in our place selling the Samyang 14mm, and the only way for me to purchase that lens is through online from Hong Kong.

Last edited by richard balonglong; 10-30-2011 at 05:13 PM.
10-30-2011, 05:29 PM   #7
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Look in the chart adam posted in the thread on wide angle lenses and field of view

10mm = 100 degrees
12 mm = 90 degrees
14mm = 81 degrees
18mm = 67 degrees

All on ASP-C frame

14mm on film will be about 105 degrees
10-30-2011, 06:00 PM   #8
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QuoteOriginally posted by Lowell Goudge Quote
Look in the chart adam posted in the thread on wide angle lenses and field of view

10mm = 100 degrees
12 mm = 90 degrees
14mm = 81 degrees
18mm = 67 degrees

All on ASP-C frame

14mm on film will be about 105 degrees
Ah, got it! Thank you man! =) Is the APS-C on that chart based on the sensor with 1.5x crop factor? =)

10-30-2011, 07:06 PM   #9
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QuoteOriginally posted by richard balonglong Quote
Thank you man for the chart! Now I'm getting the idea on how wide the Samyang 14mm on an APS-C sensor (Pentax DSLR sensor). Hmmm... So the Samyang 14mm's AOV on APS-C is 94 deg, and the Pentax DA 14mm's AOV is 92 deg (according from the description at Pentax lens database), that means the Samyang's 14mm is a bit wider comparing with Pentax's DA 14mm...? =)
The difference is trivial. It depends on the exact size of the sensors, as well as the exact focal lengths of the lenses, which vary slightly within models (copy variation <--manufacturing tolerances).

QuoteOriginally posted by richard balonglong Quote
Ah, got it! Thank you man! =) Is the APS-C on that chart based on the sensor with 1.5x crop factor? =)
Forget the crap.factor. Also, those angles don't look right. They're 10 degrees or more too narrow for each focal length on APS-C, and nowhere near for FF. The numbers for nominal APS-C (but not for my K20D) are:

10mm - 113 deg
12mm - 103 deg
14mm - 94 deg
16mm - 87 deg
18mm - 80 deg

The actuality for any specific lens may vary by a couple degrees. That's trivial.
10-31-2011, 04:30 PM   #10
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QuoteOriginally posted by RioRico Quote
Forget the crap.factor. Also, those angles don't look right. They're 10 degrees or more too narrow for each focal length on APS-C, and nowhere near for FF. The numbers for nominal APS-C (but not for my K20D) are:

10mm - 113 deg
12mm - 103 deg
14mm - 94 deg
16mm - 87 deg
18mm - 80 deg

The actuality for any specific lens may vary by a couple degrees. That's trivial.
Hehe... Thank you man! Now, I've just ordered that Samyang 14mm lens. hehe. I hope it gives me good results using it with my digital and film body. =)
10-31-2011, 05:07 PM   #11
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QuoteOriginally posted by richard balonglong Quote
Hehe... Thank you man! Now, I've just ordered that Samyang 14mm lens. hehe. I hope it gives me good results using it with my digital and film body. =)
Check the samyang club

I have posted shots from my PZ-1 and K10D
11-01-2011, 07:22 PM   #12
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QuoteOriginally posted by Lowell Goudge Quote
Check the samyang club

I have posted shots from my PZ-1 and K10D
Nice photographs man! And thank you! =)
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