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03-08-2013, 08:38 PM   #1
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APS-C and FA 43 lens focal length

I'm looking at purchasing the FA 43 lens for my K5 camera and I know the focal length will really be 1.5 times that or 64.5. My question is I have a Pentax DA 18-135mm zoom lens. If I want to approximate the FOV on the zoom lens do I look at 43mm or about 65mm on the 18-135 lens? Hope I'm making sense here......

03-08-2013, 08:53 PM   #2
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Same as the FA, so 43mm.
03-08-2013, 09:18 PM   #3
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Focal length is the same as it's a lens characteristic and has nothing to do with the camera. 43mm is 43mm no matter if you put it on a film camera or an aps-c or even looking through it with your eyes.

The difference between putting the lens on a cropped sensor is that you won't use the total field of view (wasted glass area) as the borders get cropped out. So the only difference between a full frame lens and a crop lens is that the full frame lens has the capability to project a bigger image but it doesn't matter if the sensor is too small to pick up the bigger field of view.
03-08-2013, 09:31 PM   #4
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QuoteOriginally posted by VisualDarkness Quote
Focal length is the same as it's a lens characteristic and has nothing to do with the camera. 43mm is 43mm no matter if you put it on a film camera or an aps-c or even looking through it with your eyes.

The difference between putting the lens on a cropped sensor is that you won't use the total field of view (wasted glass area) as the borders get cropped out. So the only difference between a full frame lens and a crop lens is that the full frame lens has the capability to project a bigger image but it doesn't matter if the sensor is too small to pick up the bigger field of view.
Thank you for making sense. So a 43 is a 43 is a 43 whether its on a full frame or my K5

03-08-2013, 09:33 PM   #5
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Then I will continue my quest to purchase the FA 43 and forgo the DA 35 Macro......
03-08-2013, 10:06 PM   #6
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good luck with the search, you will love the 43Ltd, it's a favourite lens of mine.
03-08-2013, 11:09 PM   #7
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QuoteOriginally posted by Driline Quote
Thank you for making sense. So a 43 is a 43 is a 43 whether its on a full frame or my K5
...or on a medium format or a 4x5 view camera or on a ...


The only difference is the field of view. (45mm is an extreme ultra-wide with 4x5.)


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03-09-2013, 08:45 AM   #8
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Good luck with the 43, I love mine. You can add the 35 Marco to the list of what to buy next.

03-09-2013, 09:12 AM   #9
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QuoteOriginally posted by Driline Quote
Then I will continue my quest to purchase the FA 43 and forgo the DA 35 Macro......
Ha ha ha ha - good one

The Limited (DA or otherwise) are simply just addictive. The only one I've been able to resist so far is the 70mm, but I honestly do not know how long that'll last (despite having the 77mm)
03-09-2013, 09:32 AM   #10
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QuoteOriginally posted by tclausen Quote
Ha ha ha ha - good one

The Limited (DA or otherwise) are simply just addictive. The only one I've been able to resist so far is the 70mm, but I honestly do not know how long that'll last (despite having the 77mm)
same here.... I started with DA 35 macro..then FA 77 and DA15 then........may be next FA 31 or sigma 30
03-09-2013, 09:45 AM   #11
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QuoteOriginally posted by Dynamo Quote
same here.... I started with DA 35 macro..then FA 77 and DA15 then........may be next FA 31 or sigma 30
Funny, I started with the 77mm - and the 35mm macro was my latest ltd. acquisition
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