Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
10-08-2019, 10:17 AM   #1
Site Supporter
Site Supporter




Join Date: Sep 2006
Location: midwest, United States
Photos: Gallery
Posts: 3,795
Using K-1 to crop 31 to 43?

Not a math wiz. If I shoot FA31 limited on K-1 in FF, then crop to match 43mm focal length, how many megapixels are left? Trying to decide if gap between 31 & 77 is too large. Ok, perhaps I'm trying to justify a FA43😇.
Thanks,
barondla

10-08-2019, 10:28 AM - 2 Likes   #2
Pentaxian
Tjompen1968's Avatar

Join Date: May 2012
Location: Norrköping, Sweden
Photos: Gallery | Albums
Posts: 1,392
The FA43 is not just a focal length in between the FA31 and FA77. It is a unique lens with special powers.

But cropping the 31 to 43 would give you about 18.5 MP. (I did a test with the actual lenses.)

Last edited by Tjompen1968; 10-08-2019 at 11:15 AM.
10-08-2019, 11:02 AM   #3
Loyal Site Supporter
Loyal Site Supporter
pschlute's Avatar

Join Date: Mar 2007
Location: Surrey, UK
Photos: Gallery
Posts: 3,456
QuoteOriginally posted by barondla Quote
Not a math wiz. If I shoot FA31 limited on K-1 in FF, then crop to match 43mm focal length, how many megapixels are left? Trying to decide if gap between 31 & 77 is too large
Ypu have the 31 and 77 and don't intend to get the 43 ?? ???????

OMG !
10-08-2019, 11:09 AM   #4
Pentaxian
Tjompen1968's Avatar

Join Date: May 2012
Location: Norrköping, Sweden
Photos: Gallery | Albums
Posts: 1,392
I have had the 31 and 77 for a long time but did not want the 43 due to it's bad rep. Shooting with it for a month now I understand why. The 43 is not like the other two, it is another kind of lens. A little more difficult to figure out I guess. But it is a lens you need. I love it the same way I love my FA31 and FA77.

10-08-2019, 12:04 PM   #5
Loyal Site Supporter
Loyal Site Supporter




Join Date: May 2016
Location: East Coast
Posts: 1,932
Not to be crass here, but it really is pointless to be talking cropping and MP regarding these particular lenses. The 43 is just a special creature, like the 31 and 77 are. You deserve to have one. I would be very surprised if you regretted it.

10-08-2019, 12:51 PM   #6
Site Supporter
Site Supporter
kiwi_jono's Avatar

Join Date: Dec 2009
Location: Christchurch, New Zealand
Photos: Gallery | Albums
Posts: 1,592
Another one here who held off getting the 43 and pleasantly surprised when I eventually did get it.

While I think the border sharpness and quality OOF rendering is probably a little better on the 31 and 77, the 43 is deserving of a spot in the camera bag because:
1. Its such a versatile focal length on FF. Now my go to default lens and certainly always in my bag.
2. It has nice colours and contrast.
3. OOF rendering is till pretty nice but different to the other limiteds
4. Its so small there is no reason not to take it everywhere.
5. Its very unobtrusive to the subjects you are shooting (small and non threatening).
10-08-2019, 04:08 PM   #7
Site Supporter
Site Supporter




Join Date: Sep 2006
Location: midwest, United States
Photos: Gallery
Posts: 3,795
Original Poster
QuoteOriginally posted by Tjompen1968 Quote
The FA43 is not just a focal length in between the FA31 and FA77. It is a unique lens with special powers.

But cropping the 31 to 43 would give you about 18.5 MP. (I did a test with the actual lenses.)
Thank you for doing the testing. Now I know the 31 cropped to 43 matches or slightly beats the 31 on my K-01/K-7. Yes the 43 has special Pentax dust in it. So does the 31 cropped.

I already have a XS40. Trying to decide if a 43 would be worthwhile. Buying one means diverting money from other camera equipment. It also means one more lens to carry in the bag. Already have more lenses than will fit in the Little Bit Bigger Domke bag.

Wasn't aware the FA43 had a bad rep? Need to search some XS40 vs FA43 comparison images.
Thanks to everyone for replying,
barondla
10-08-2019, 04:33 PM   #8
Loyal Site Supporter
Loyal Site Supporter
Mikesul's Avatar

Join Date: Sep 2009
Location: Phoenix, AZ
Posts: 5,552
It doesn't really have a bad rap just a number of users complaining because it is different from the 77 and 31. Tjompen1968 and Kiwi_jono have explained its advantages well.

10-08-2019, 04:52 PM   #9
Pentaxian
Tjompen1968's Avatar

Join Date: May 2012
Location: Norrköping, Sweden
Photos: Gallery | Albums
Posts: 1,392
What lens is a XS40?

The cropped FA31 has FA31 pixie dust, not FA43 pixie dust. The rendering is different.
10-08-2019, 04:56 PM   #10
Loyal Site Supporter
Loyal Site Supporter
Mikesul's Avatar

Join Date: Sep 2009
Location: Phoenix, AZ
Posts: 5,552
It is an ultra compact (Pancake) version of the DA 40
10-08-2019, 04:59 PM   #11
Loyal Site Supporter
Loyal Site Supporter




Join Date: May 2016
Location: East Coast
Posts: 1,932
QuoteOriginally posted by barondla Quote
I already have a XS40. Trying to decide if a 43 would be worthwhile.
I had the 40XS before I bought my 43. I basically never used it after getting the 43, and passed it down to one of my daughters. The 43 has it's own character, and as others have pointed out, it's small enough it's hard not to have on hand. It's a lens I find I use almost equally between APS-C and full frame. In other threads, when challenged on, "just one", it's been my one.
10-08-2019, 05:00 PM   #12
Loyal Site Supporter
Loyal Site Supporter




Join Date: May 2016
Location: East Coast
Posts: 1,932
QuoteOriginally posted by Mikesul Quote
It is an ultra compact (Pancake) version of the DA 40
And was externally designed by Marc Newson to compliment the K-01.
10-08-2019, 05:07 PM   #13
Otis Memorial Pentaxian
Loyal Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 33,950
QuoteOriginally posted by Mikesul Quote
It is an ultra compact (Pancake) version of the DA 40
Which is derived from the Pentax-M 40/2.8 pancake


Steve
10-08-2019, 05:19 PM   #14
Pentaxian
swanlefitte's Avatar

Join Date: May 2015
Location: New Orleans
Photos: Gallery
Posts: 2,408
31/43 squared times 36.2= 18.81.

Edit. Like the apsc 2/3 crop factor makes a 100mm appear like a 150mm on FF. 100/150= 2/3 both horizontal and vertical so squared.

Last edited by swanlefitte; 10-08-2019 at 05:46 PM.
10-08-2019, 05:41 PM   #15
Loyal Site Supporter
Loyal Site Supporter




Join Date: Feb 2014
Photos: Gallery
Posts: 129
43 discussion

Just picked one up on eBay. Looking forward to shooting with it. Thanks for the discussion, very helpful.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
crop, dslr, full frame, full-frame, k-1, k-1 to crop, k1, pentax k-1
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
What crop lens is most like the FA 31 on Full Frame? UncleVanya Pentax SLR Lens Discussion 52 02-02-2019 03:36 PM
Landscape To Crop or not to Crop? cfbuck Photo Critique 11 01-16-2019 10:45 AM
To crop or not to crop... wildman Pentax Mirrorless Cameras 8 10-17-2016 09:48 AM
Streets To crop or not to crop? micromacro Photo Critique 2 03-08-2015 12:09 AM
Night To crop or no to crop...? esman7 Photo Critique 17 01-17-2010 08:28 PM



All times are GMT -7. The time now is 08:47 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top