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03-04-2013, 01:40 PM   #1
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Lenses to Replace the 17-70

I have been using the 17-70 f4 since I switched to Pentax and I have found myself not wanting to use it. I find myself getting my 35 f2.4 or using my Contax G1. I am thinking of selling it and should get 330-360 as I have the box and warranty. What AF primes should I replace it with? I am looking to get a couple of FA primes to be ready for the Pentax ff

I can probably stretch to 500 seeing as I'm selling my Voigtlander Bessa and assorted crud and got a great deal on my Sigma 8-16, 80 cheaper than the 10-20.

any suggestions?

03-04-2013, 01:50 PM   #2
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You could try the DA 50 F1.8 (cheaper than your 17-70), or DA 70 F2.4 (more expensive than your 17-70), or DA 15 F4 (about the same as your 17-70, I think).
03-04-2013, 02:14 PM   #3
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Quite hard, since you've already quite some prime lenses and since you're selling the 8-16 i'm putting some question marks with advicing wide angle prime.

Only suggestion i can think of is upgrading your 50mm lens, maybe get a FA 50mm f1.4 or f/1.2, the Sigma 50mm f/1.4 is also an option since it's FF as well but with HSM focusing.
03-04-2013, 03:00 PM   #4
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QuoteOriginally posted by Anvh Quote
Quite hard, since you've already quite some prime lenses and since you're selling the 8-16 i'm putting some question marks with advicing wide angle prime.

Only suggestion i can think of is upgrading your 50mm lens, maybe get a FA 50mm f1.4 or f/1.2, the Sigma 50mm f/1.4 is also an option since it's FF as well but with HSM focusing.
I'm actually not selling the 8-16, I had a 10-20 but got the 8-16 at a great price. I can get the 50mm f1.4 at around 230, would a 35mm f2 be good to complement this?

03-04-2013, 03:13 PM   #5
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Perhaps do an EXIF Tools analysis of your existing stock, to work out the focal lengths you prefer? I shot an event recently, did this, and discovered 75% of the shots were at 50mm on my Tamron 17-50mm, so with the help of the guys here, plumped for the DA* 50-135mm, which I'm not regretting.

What were you not liking about the 17-70? Or was it just you have primes?
03-04-2013, 03:13 PM   #6
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Look at your signature, you just sell the 17-70 and that's it. If you need AF the best should be in the 50mm range. You already have 35 f/2.4 so no need for 35 f/2 (they are both FF capable).
03-04-2013, 03:16 PM   #7
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I agree with Pheo, look at your EXIF data, there are tools that will do it for you. I did so before embarking on my Prime move and used it as a guide to picking them based on what I used most. From my 18-55 I went to 35 and 50 (I've since branched out but those were my clusters initially).
03-04-2013, 03:21 PM   #8
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I would aim for a moderate wide (28/31), a normal (43/50), and a short tele (77/85) prime kit. Those focal lengths have stood the test of time in 35mm land and are available for Pentax.

Since you already have a 35/2.5 and an M50/1.7 I think a FA77 or perhaps a Sigma85/1.4 would make sense next. If you can swap your M50 for a FA50/1.4 as well that would be ideal.


Last edited by twitch; 03-04-2013 at 03:30 PM.
03-04-2013, 03:22 PM   #9
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Save up for an FA31
03-04-2013, 05:33 PM   #10
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I don't know if your 28/2.8 is auto focus, but I would suggest the Pentax F-28 2.8 if it isn't and you're determined to get an auto focus lens. I've been really happy with mine and it is a full frame lens.
03-04-2013, 05:59 PM   #11
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Yeah, if you really think ~35mm is your focal length and want something great (judging from others) and FF ready maybe check out an used 31/1.8 as people said here. Then you'll be set and ready if Pentax brings out a FF camera or if they, hope not since I want one, stop making the 31's. That would really push the price up up up!
03-05-2013, 03:56 AM   #12
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QuoteOriginally posted by vodanh1982 Quote
Look at your signature, you just sell the 17-70 and that's it. If you need AF the best should be in the 50mm range. You already have 35 f/2.4 so no need for 35 f/2 (they are both FF capable).

Wait, the 35mm f2.4 is FF?!?!? I'm not sure about that. I think the 50mm f1.4 would be a good addition. Which has better performance, the Sigma or Pentax

Also, I just realized that the Sigma 70mm macro is a FF lens so I will use that for my macro, and maybe will supplement it with an 85mm f1.4 Seeing as my 70-200 is also FF, it seems I only need to look at the 50mm, 85, and 30ish.

Last edited by gooseta; 03-05-2013 at 04:02 AM.
03-05-2013, 05:39 AM   #13
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Some of the DA lenses have large enough image circle for FF but they don't officially support it.

Some of the DA lenses like the DA*200 for example uses the same lens design as the FA*200.
03-05-2013, 08:58 AM   #14
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QuoteOriginally posted by gooseta Quote
Wait, the 35mm f2.4 is FF?!?!? I'm not sure about that. I think the 50mm f1.4 would be a good addition. Which has better performance, the Sigma or Pentax

Also, I just realized that the Sigma 70mm macro is a FF lens so I will use that for my macro, and maybe will supplement it with an 85mm f1.4 Seeing as my 70-200 is also FF, it seems I only need to look at the 50mm, 85, and 30ish.
The 35mm f/2.4 can be used in FF base on this https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/31629-da-lens-...ts-thread.html

The Sigma 50mm f/1.4 is sharper than FA 50 f/1.4 but the Sigma has focus shift.
03-05-2013, 01:44 PM   #15
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Is the pentax 50mm f1.4 decently sharp wide open?
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