Fast normal prime lens for Pentax?

Started 9 months ago | Discussions
SpyderDoom
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Fast normal prime lens for Pentax?
9 months ago

Hello!

I've just discovered the Pentax DSLRs and I like very much the idea of a proper pentaprism viewfinder and the weather/dust/freeze resistant design.

Can you tell me what is the equivalent lens of the Sony DT 35mm f/1.8 for Pentax? Is there any weather resistant design?

Thank you very much!

Younes B
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Re: Fast normal prime lens for Pentax?
In reply to SpyderDoom, 9 months ago

Pentax DA 35 2.4 . That's the cheap one ( but very good ) . PLastic construction . Circa 170 new , often on sale.

or the Llimited ( name of this series of primes ): DA 35 2.8 MAcro Limited. Top construction; Macro capability. A bit pricey at ciirca $700 new.

Pentax does not have a 35 that opens @ 1.8 ( I suspect you you have the NIkon prime ? )

Cheers

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sumx4182
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Re: Fast normal prime lens for Pentax?
In reply to SpyderDoom, 9 months ago

SpyderDoom wrote:

Hello!

I've just discovered the Pentax DSLRs and I like very much the idea of a proper pentaprism viewfinder and the weather/dust/freeze resistant design.

Can you tell me what is the equivalent lens of the Sony DT 35mm f/1.8 for Pentax? Is there any weather resistant design?

Thank you very much!

Sigma 35mm f1.4 Art!

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Conjure
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Re: Fast normal prime lens for Pentax?
In reply to SpyderDoom, 9 months ago

SpyderDoom wrote:

Hello!

I've just discovered the Pentax DSLRs and I like very much the idea of a proper pentaprism viewfinder and the weather/dust/freeze resistant design.

Can you tell me what is the equivalent lens of the Sony DT 35mm f/1.8 for Pentax? Is there any weather resistant design?

Thank you very much!

Welcome!

Sony DT 35 mm f/1.8 SAM: 170 grams
http://www.lenstip.com/305.11-Lens_review-Sony_DT_35_mm_f_1.8_SAM_Summary.html
http://www.photozone.de/sony-alpha-aps-c-lens-tests/646-sony35f18dt?start=2

Yes, there are equivalent or better lenses for Pentax:

Pentax smc DA 35 mm f/2.4 AL: 124 grams
http://www.lenstip.com/299.11-Lens_review-Pentax_smc_DA_35_mm_f_2.4_AL_Summary.html
http://www.photozone.de/pentax/598-pentax_35_24?start=2

Pentax smc FA 35 mm f/2 AL: 195 grams
http://www.lenstip.com/254.11-Lens_review-Pentax_smc_FA_35_mm_f_2_AL_Summary.html
http://www.photozone.de/pentax/123-pentax-smc-fa-35mm-f2-al-photozone-review--test-report?start=2

The weather resistant design makes more sense on zoom lenses, because you don't change prime lenses in heavy weather. Nevertheless, there are also some prime lenses (55mm, 100mm macro, 200mm, 300mm) from Pentax which are weather resistant.

Cheers

Anton

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viking79
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Re: Fast normal prime lens for Pentax?
In reply to sumx4182, 9 months ago

Or Sigma 30mm f/1.4 ART for about half as much since it isn't full frame coverage.

Eric

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Sanjeev Das
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Re: Fast normal prime lens for Pentax?
In reply to SpyderDoom, 9 months ago

FA 31 f/1.8 Limited

DA 35 f/2.8 Limited

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SpyderDoom
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Re: Fast normal prime lens for Pentax?
In reply to SpyderDoom, 9 months ago

Thank you all. I'm considering the Pentax K-50 as my first DSLR ever, among the entry level ones from Canon, Nikon and Sony. It looks bombproof.

Should I get the body only (with what aftermarket lens?), go for the basic or the double kit?

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fakuryu
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Re: Fast normal prime lens for Pentax?
In reply to SpyderDoom, 9 months ago

SpyderDoom wrote:

Thank you all. I'm considering the Pentax K-50 as my first DSLR ever, among the entry level ones from Canon, Nikon and Sony. It looks bombproof.

Should I get the body only (with what aftermarket lens?), go for the basic or the double kit?

It depends if a weather resistant system is that important for you. You can get a K50 and the 18-135WR kit as an all around WR kit already.

But if it was me, I'd get the K50 and 18-55WR just for the sake of having a WR kit if needed and get a Sigma 17-70 f2.8-f4 Contemporary if I wanted something more versatile and with better IQ.

Plus don't forget those beautiful vintage Pentax primes like the SMC-M 50mm f1.4 and f1.7 (SMC-A too) and the Super Takumars like the 55mm f1.8. I just love how my SMC-M 50mm f1.4 renders and probably one of the main reasons why the prime lens from Canikon does not really rock my boat (except for that Otus)

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miles green
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Well, there is the 31....
In reply to SpyderDoom, 9 months ago

Pentax's normal fast prime is the 31/1.8 Limited, a spectacular lens by all accounts. It's a premium lens, so it's not cheap.

I'm not sure how practical normal-length WR primes would be - the camera isn't WR while you're busy changing lens, so it's still a no-go in rain, snowstoms, sandstorms etc...

If you're new to Pentax, try to get a limited lens, imho they are really worth the cost, and a good reason to shoot Pentax by themselves.

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yesman12
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Re: Fast normal prime lens for Pentax?
In reply to SpyderDoom, 9 months ago

there is teh FA 2.0 35 mm. Great lens. and I am selling mine on pentax forum under the name spartan.  I bought the 31 ltd and dont use this anymore.

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Russell Evans
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Re: Fast normal prime lens for Pentax?
In reply to SpyderDoom, 9 months ago

SpyderDoom wrote:

Should I get the body only (with what aftermarket lens?), go for the basic or the double kit?

I would go with the K-50 with either the single kit 18-55mm WR lens, US $573 and the US $411 DA HD 55-300mm WR for a total of US $984, or the K-50 with the 18-135mm WR kit for US $840. Add a used DA 15mm f4 after that and then add the DA 35mm f2.4 and DA 50mm f1.8 when you can.

Thank you
Russell

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JNR
JNR
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Re: Fast normal prime lens for Pentax?
In reply to yesman12, 9 months ago

yesman12 wrote:

there is teh FA 2.0 35 mm. Great lens. and I am selling mine on pentax forum under the name spartan. I bought the 31 ltd and dont use this anymore.

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Best regards
Nick

Given the specs as requested by the OP, the FA 35mm f/2 is probably the closest comparison. This lens is still very good into the corners wide open (as is to be expected for a full frame), and considerably more solid in build than the f/2.4. It balances very nicely with the K-50.

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Jim King
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Re: Fast normal prime lens for Pentax?
In reply to JNR, 9 months ago

JNR wrote:

Given the specs as requested by the OP, the FA 35mm f/2 is probably the closest comparison. This lens is still very good into the corners wide open (as is to be expected for a full frame), and considerably more solid in build than the f/2.4. It balances very nicely with the K-50.

See a good review of this lens here. I have a copy and find it almost as good as my FA 31mm Limited, although it isn't as solidly built.

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JNR
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Re: Fast normal prime lens for Pentax?
In reply to Jim King, 9 months ago

Jim King wrote:

See a good review of this lens here. I have a copy and find it almost as good as my FA 31mm Limited, although it isn't as solidly built.

As the various reviews indicate, it is quite consistent in all aspects, all the way to f/2. The build doesn't bother me, but its relatively poor resistance to veiling (loss of contrast against the light) is rather surprising for a modern prime. My much older 50mm f/1.4 (m series) has far superior SMC coatings yielding better contrast, as does the DA 16-45 - which is at its best from 28 to 35mm.

If I ever get a 31 Ltd. - which strikes me as a true "normal," I'd likely sell off the FA 35.

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audiobomber
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Re: Fast normal prime lens for Pentax?
In reply to JNR, 9 months ago

JNR wrote:

Jim King wrote:

See a good review of this lens here. I have a copy and find it almost as good as my FA 31mm Limited, although it isn't as solidly built.

As the various reviews indicate, it is quite consistent in all aspects, all the way to f/2. The build doesn't bother me, but its relatively poor resistance to veiling (loss of contrast against the light) is rather surprising for a modern prime. My much older 50mm f/1.4 (m series) has far superior SMC coatings yielding better contrast, as does the DA 16-45 - which is at its best from 28 to 35mm.

Flare resistance is a strength according to the Lenstip review. That is what I've found as well.

"Work against bright light is definitely a strong point of the tested lens."

http://www.lenstip.com/254.9-Lens_review-Pentax_smc_FA_35_mm_f_2_AL_Ghosting_and_flares.html

The Lenstip review is pretty much a rave:

"If you look closely at the accomplishments of the tested lens’s optics, you can find that it is the best 2/35 class instrument tested by us."

The FA 35 keeps me from buying an FA 31, and keeps me from using my DA 40mm Limited.

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Dan

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Gerry Winterbourne
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Re: Fast normal prime lens for Pentax?
In reply to SpyderDoom, 9 months ago

SpyderDoom wrote:

Thank you all. I'm considering the Pentax K-50 as my first DSLR ever, among the entry level ones from Canon, Nikon and Sony. It looks bombproof.

Should I get the body only (with what aftermarket lens?), go for the basic or the double kit?

As it's your first DSLR I advise buying just the 18-55 kit lens with it.  Use this lens for a couple of months (at least) until you've learned your camera.  Then analyse the pictures you've taken to find out which focal lengths you use most - or want: you may find you want something wider than 18mm, longer than 55mm or faster than f/3.5-5.6.

I know it seems attractive to cover "every" FL (although the double kit misses the range 8-18mm which is only 10mm but has an area of view range of 5X, which is about the same as the 55-125mm FL range).  The extra FOV at wide angles speaks for itself.  It's less obvious, but often very important, that kit tele-zooms are painfully slow.

Although you've been pointed to some excellent normal primes I think the sensible one to start with is the DA35/2.4.  Because it's so cheap it means you have money in the bank for better lenses once you've decided what you'll want in the longer term.  Someone suggested the 18-135 lens; for about the same price you can get the 18-55WR kit lens, DA35/2.4 and DFA100/2.8WR macro. Note that I'm not saying you should buy this set - that's something to decide in the future.  All I'm saying is don't spend a lot of money until you've built some experience.

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JNR
JNR
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Re: Fast normal prime lens for Pentax?
In reply to audiobomber, 9 months ago

audiobomber wrote:

JNR wrote:

Jim King wrote:

See a good review of this lens here. I have a copy and find it almost as good as my FA 31mm Limited, although it isn't as solidly built.

As the various reviews indicate, it is quite consistent in all aspects, all the way to f/2. The build doesn't bother me, but its relatively poor resistance to veiling (loss of contrast against the light) is rather surprising for a modern prime. My much older 50mm f/1.4 (m series) has far superior SMC coatings yielding better contrast, as does the DA 16-45 - which is at its best from 28 to 35mm.

Flare resistance is a strength according to the Lenstip review. That is what I've found as well.

"Work against bright light is definitely a strong point of the tested lens."

http://www.lenstip.com/254.9-Lens_review-Pentax_smc_FA_35_mm_f_2_AL_Ghosting_and_flares.html

The Lenstip review is pretty much a rave:

"If you look closely at the accomplishments of the tested lens’s optics, you can find that it is the best 2/35 class instrument tested by us."

The FA 35 keeps me from buying an FA 31, and keeps me from using my DA 40mm Limited.

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Dan

Yes, it does just fine against the light in particular circumstances. Flare as typically tested with specular light (the sun for example) in the frame or near it. This is very different from veiling caused by broad areas of background light that reduce lens contrast significantly and is rarely included in the lens review testing. The FA 35 copes poorly with bright windows in the background or even toward the sides if that light reaches the front element.

You would think this was taken with wide open aperture, but it is stopped down to near-peak lens performance at f/4 (full frame from RAW as shot, except reduced to 25% of original, and minor color temp. correction):

Certainly correctable from a RAW image, but it would be a real challenge to fix from JPEG. I could post many shots like this, but in recent years have avoided using this lens in this kind of situation, so no recent examples. (I have no less than five K-mount lenses that match this focal length and aperture, and all of them would perform significantly better in this situation. That said, the FA 35mm is a better lens in the majority of situations - just not this one.)

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JNR
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