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**barondla** · 10-08-2019, 10:17 AM

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

Unregistered User · 10-08-2019, 10:28 AM - **2 Likes**

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.)

pschlute · 10-08-2019, 11:02 AM

Originally posted by barondla

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 !

Unregistered User · 10-08-2019, 11:09 AM

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.

**clickclick** · 10-08-2019, 12:04 PM

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.

**kiwi_jono** · 10-08-2019, 12:51 PM

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).

**barondla** · 10-08-2019, 04:08 PM

Originally posted by Tjompen1968

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

**Mikesul** · 10-08-2019, 04:33 PM

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.

Unregistered User · 10-08-2019, 04:52 PM

What lens is a XS40?

The cropped FA31 has FA31 pixie dust, not FA43 pixie dust. The rendering is different.

**Mikesul** · 10-08-2019, 04:56 PM

It is an ultra compact (Pancake) version of the DA 40

**clickclick** · 10-08-2019, 04:59 PM

Originally posted by barondla

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.

**clickclick** · 10-08-2019, 05:00 PM

Originally posted by Mikesul

It is an ultra compact (Pancake) version of the DA 40

And was externally designed by Marc Newson to compliment the K-01.

stevebrot · 10-08-2019, 05:07 PM

Originally posted by Mikesul

It is an ultra compact (Pancake) version of the DA 40

Which is derived from the Pentax-M 40/2.8 pancake

Steve

swanlefitte · 10-08-2019, 05:19 PM

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.

**Buckeyemikie** · 10-08-2019, 05:41 PM

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

10-08-2019, 10:17 AM	#1
barondla Site Supporter Join Date: Sep 2006 Location: midwest, United States Photos: Gallery \| Albums Posts: 5,717	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
Unregistered User Guest	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 Unregistered User; 10-08-2019 at 11:15 AM.

10-08-2019, 05:19 PM	#14
swanlefitte Pentaxian Join Date: May 2015 Location: Minneapolis Photos: Gallery Posts: 4,068	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
Buckeyemikie Site Supporter Join Date: Feb 2014 Photos: Gallery Posts: 504	43 discussion Just picked one up on eBay. Looking forward to shooting with it. Thanks for the discussion, very helpful.

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10-08-2019, 11:02 AM	#3
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,223	Originally posted by barondla 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
Unregistered User Guest	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
clickclick Loyal Site Supporter Join Date: May 2016 Location: East Coast Posts: 2,904	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
kiwi_jono Loyal Site Supporter Join Date: Dec 2009 Location: Christchurch, New Zealand Photos: Gallery \| Albums Posts: 2,437	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
barondla Site Supporter Join Date: Sep 2006 Location: midwest, United States Photos: Gallery \| Albums Posts: 5,717 Original Poster	Originally posted by Tjompen1968 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
Mikesul Loyal Site Supporter Join Date: Sep 2009 Location: Phoenix, AZ Posts: 7,594	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
Unregistered User Guest	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
Mikesul Loyal Site Supporter Join Date: Sep 2009 Location: Phoenix, AZ Posts: 7,594	It is an ultra compact (Pancake) version of the DA 40

10-08-2019, 04:59 PM	#11
clickclick Loyal Site Supporter Join Date: May 2016 Location: East Coast Posts: 2,904	Originally posted by barondla 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
clickclick Loyal Site Supporter Join Date: May 2016 Location: East Coast Posts: 2,904	Originally posted by Mikesul 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
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by Mikesul It is an ultra compact (Pancake) version of the DA 40 Which is derived from the Pentax-M 40/2.8 pancake Steve

Using K-1 to crop 31 to 43?

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