Win a Pentax Limited Lens: Raffle Now Live!

**BruceBanner** · 05-17-2017, 03:12 PM

I own the K-1, and this lens needs used in crop mode to avoid vignetting. I'm curious, once a picture is snapped with the HD Pentax-DA 21mm on a FF device but in crop mode, what does it 'become' equivalent too? What is the left over 'field of view' once cropped? Is it similar to a 35mm for example?

Cheers,

Bruce

enoeske · 05-17-2017, 03:19 PM

Originally posted by BruceBanner

I own the K-1, and this lens needs used in crop mode to avoid vignetting. I'm curious, once a picture is snapped with the HD Pentax-DA 21mm on a FF device but in crop mode, what does it 'become' equivalent too? What is the left over 'field of view' once cropped? Is it similar to a 35mm for example?

Cheers,

Bruce

If you use the APS-C crop, then its a 1.5x FoV crop factor. So a 21mm would appear similar to the FoV of a (21x1.5=) 31.5mm

Adam · 05-17-2017, 03:34 PM - **1 Like**

It's essentially the same FoV as you'd get on an APS-C camera, such as the K-3 for instance. 69.8 degrees per the table:

**BruceBanner** · 05-17-2017, 03:49 PM

Originally posted by enoeske

If you use the APS-C crop, then its a 1.5x FoV crop factor. So a 21mm would appear similar to the FoV of a (21x1.5=) 31.5mm

Originally posted by Adam

It's essentially the same FoV as you'd get on an APS-C camera, such as the K-3 for instance. 69.8 degrees per the table:

Thank you guys

05-17-2017, 03:12 PM	#1
BruceBanner Site Supporter Join Date: Dec 2015 Posts: 5,405	HD Pentax-DA 21mm F3.2 Limited in FF Crop Mode I own the K-1, and this lens needs used in crop mode to avoid vignetting. I'm curious, once a picture is snapped with the HD Pentax-DA 21mm on a FF device but in crop mode, what does it 'become' equivalent too? What is the left over 'field of view' once cropped? Is it similar to a 35mm for example? Cheers, Bruce

05-17-2017, 03:34 PM - 1 Like	#3
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,609	It's essentially the same FoV as you'd get on an APS-C camera, such as the K-3 for instance. 69.8 degrees per the table: Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
FF mode - DA15 - crop factors & crop sizes	acoufap	Pentax K-1 & K-1 II	21	05-10-2018 09:49 PM
IQ comparison between Crop mode & FF mode	MyTZuS	Pentax K-1 & K-1 II	31	10-08-2016 08:26 PM
For Sale - Sold: HD Pentax DA 21mm f3.2 AL Limited - As New in Box with Caps & Papers - Pristine Lens	SparkTronic	Sold Items	3	07-08-2016 02:41 PM
Pentax HD DA 21mm F3.2 Limited Lens	runswithsizzers	Pentax Price Watch	7	02-20-2016 08:33 AM
HD DA 21mm Limited vs. HD DA 20-40mm Limited	seachongo	Pentax SLR Lens Discussion	10	05-09-2015 11:18 PM

05-17-2017, 03:19 PM	#2
enoeske Veteran Member Join Date: Jul 2009 Location: Surprise, Az Photos: Gallery Posts: 2,136	Originally posted by BruceBanner I own the K-1, and this lens needs used in crop mode to avoid vignetting. I'm curious, once a picture is snapped with the HD Pentax-DA 21mm on a FF device but in crop mode, what does it 'become' equivalent too? What is the left over 'field of view' once cropped? Is it similar to a 35mm for example? Cheers, Bruce If you use the APS-C crop, then its a 1.5x FoV crop factor. So a 21mm would appear similar to the FoV of a (21x1.5=) 31.5mm

05-17-2017, 03:49 PM	#4
BruceBanner Site Supporter Join Date: Dec 2015 Posts: 5,405 Original Poster	Originally posted by enoeske If you use the APS-C crop, then its a 1.5x FoV crop factor. So a 21mm would appear similar to the FoV of a (21x1.5=) 31.5mm Originally posted by Adam It's essentially the same FoV as you'd get on an APS-C camera, such as the K-3 for instance. 69.8 degrees per the table: Thank you guys

HD Pentax-DA 21mm F3.2 Limited in FF Crop Mode

Win a Pentax Limited Lens: Raffle Now Live!