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10-22-2013, 08:10 PM   #1
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SMC DA(1.8) vs SMCP- FA(1.4)

Referring to Bhphotovideo's specs.

The 1.8 has a WR Feature.
And has a 31.5 angle of view.


The 1.4 has no WR Feature
but it has a 47 angle of view



1st Question, What does DA and FA stand for?

2nd Question, The size of the aperture affects the angle of view?

APS-C and Full-Frame factors put aside.

10-22-2013, 08:13 PM   #2
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QuoteOriginally posted by steezylistic Quote
Referring to Bhphotovideo's specs.

The 1.8 has a WR Feature.
And has a 31.5 angle of view.


The 1.4 has no WR Feature
but it has a 47 angle of view



1st Question, What does DA and FA stand for?

2nd Question, The size of the aperture affects the angle of view?

APS-C and Full-Frame factors put aside.
The 47 angle of view applies to film cameras only. On a Pentax DSLR, you will get 31.5 degrees with both lenses. (more details specs can be found in our lens database)

Here's some info on Pentax's lens series:
Pentax K-Mount Lenses Explained: The differences between various Pentax lens series

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10-22-2013, 08:18 PM   #3
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Okay, so I just looked up the Pentax UWA 15mm f/4 and the Pentax SMC DA 25mm f/4,

Why does it say that the 25mm has a 95 angle of view and the 15mm has 86?

Unless there's something specific that's in the 25mm that makes it that way.
10-22-2013, 08:23 PM   #4
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QuoteOriginally posted by steezylistic Quote
Okay, so I just looked up the Pentax UWA 15mm f/4 and the Pentax SMC DA 25mm f/4,

Why does it say that the 25mm has a 95 angle of view and the 15mm has 86?

Unless there's something specific that's in the 25mm that makes it that way.
The DA 25mm F4 is for the 645D, which has a sensor that's about 4x as big as the ones in APS-C cameras, so it sees a lot more. If you were to adapt it on a K-mount DSLR, it would see less.

Here's a complete FOV table by the way:
https://www.pentaxforums.com/forums/pentax-lens-articles/93714-field-view-tab...d-645-6x7.html


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10-22-2013, 08:30 PM   #5
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OH! I totally disregarded that it said "645D". Hahaha Woops, thanks for the clarification
10-22-2013, 08:34 PM   #6
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The DA 15mm f4 is for Pentax's APS-C digital cameras. Cost about US$600. K-3, K-5, K-30 et cetera.

The DA 25mm f4 is for Pentax's Medium Format cameras. Cost about US$5,000. For 645 film and 645 digital cameras only.

The medium format cameras have a bigger sensor area and the lens needs to cover this wider area, hence the wider angle.

Regards

Chris
10-23-2013, 04:58 AM   #7
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You may have misinterpreted B&H's description. The DA50 f/1.8 is not WR, at least not per Pentax' official designation. The SP coating only applies to the coating on the glass, making it easier to repel water and wipe clean.

Some other Pentax lenses are designated WR (weather resistant) which means those have seals to help block water and dust from getting in between the moving parts.
10-23-2013, 11:22 AM   #8
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QuoteOriginally posted by Tanzer Quote
You may have misinterpreted B&H's description. The DA50 f/1.8 is not WR, at least not per Pentax' official designation. The SP coating only applies to the coating on the glass, making it easier to repel water and wipe clean.

Some other Pentax lenses are designated WR (weather resistant) which means those have seals to help block water and dust from getting in between the moving parts.
Aw dang, so... is there a 50mm f/1.8 WR?

10-23-2013, 12:17 PM   #9
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QuoteOriginally posted by steezylistic Quote
Aw dang, so... is there a 50mm f/1.8 WR?
The closest is the DA* 55mm f1.4 - the * lenses are all weather sealed.
10-23-2013, 03:59 PM   #10
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Yup, it's expensive, but a great lens. I have yet to expose mine to the elements.

You have some reasonably-priced zoom options, but unfortunately, if you are looking for a weather-sealed prime, all of your options are quite expensive.
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