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11-21-2012, 09:23 PM   #1
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First lens purchase, need help.

I have a Pentax K-x that I got a couple years ago. This past year it's just been sitting as I haven't had time to go out and take pictures. I really miss it so I am looking to start up again once school gets out in December. I've always wanted a fish eye lens and the Rokinon 8mm is on sale for $214 right now. I was thinking abot picking it up but I only have the two kit lens (18-55 and 55-300). Well, I also have an old 50mm/1.8 but I really suck at manual focus and have lost some good shots because of that. B&H has the Pentax 50/1.8 and 35/2.4 for around the same price as the Rokinon. Should I look at one of those or is there a "essential" type lens I should look for (which would be around the $250 range)?


Thanks for any help.

11-21-2012, 09:30 PM   #2
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The fisheye sounds like more fun, and would provide a focal length you do not have. Due to the short focal length, there is quite a bit of depth of focus, so focusing is a little more forgiving :-)
11-21-2012, 09:32 PM   #3
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Welcome back.

The Rokinon is a manual focus lens, just FYI, but its easier because of DoF than your 50. If you want to try Fish-eye it is cheap and gets solid marks. That's a really good deal. The 35/2.4 is a gem and is "normal" on the K-x. I like it a lot and think thst optically its up there with the 40Ltd. I find 50s to be less functional for me indoors because thry are too tight. Outdoors they're fine but often not long enough on the K-x. You've got a solid pair of kit lenses. It really boils down to what kind of photos do you want to make? The fish-eye extends your repertoire while the 35 & 50 refine what you can already do with your current lenses.
11-21-2012, 09:37 PM   #4
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I love my 35/2.4. It takes incredibly crisp shots. I just picked up the 50/1.8 but I haven't really played with it as I'm working on a monthly challenge with my 10-17 fe which I'm having a lot of fun with too. The couple of test shots I did with the 50mm were very nice.

11-21-2012, 09:37 PM   #5
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I was leaning towards the 35 more than the 50 because I've ran into difficulties with the 50 in doors when using it, but the 50 should be better in low light, correct? I really like the idea of a fisheye as it seems like a fun lens to mess around with.
11-21-2012, 09:49 PM   #6
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QuoteOriginally posted by mojoe_24 Quote
I was leaning towards the 35 more than the 50 because I've ran into difficulties with the 50 in doors when using it, but the 50 should be better in low light, correct? I really like the idea of a fisheye as it seems like a fun lens to mess around with.
I have a 50/1.4 and its great but harder to use around the house than the 35/2.4. I just got my first fish-eye, it's for my Q, and you're right - it's just plain fun to use.
11-22-2012, 02:05 AM   #7
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QuoteOriginally posted by mojoe_24 Quote
I have a Pentax K-x that I got a couple years ago. This past year it's just been sitting as I haven't had time to go out and take pictures. I really miss it so I am looking to start up again once school gets out in December. I've always wanted a fish eye lens and the Rokinon 8mm is on sale for $214 right now. I was thinking abot picking it up but I only have the two kit lens (18-55 and 55-300). Well, I also have an old 50mm/1.8 but I really suck at manual focus and have lost some good shots because of that. B&H has the Pentax 50/1.8 and 35/2.4 for around the same price as the Rokinon. Should I look at one of those or is there a "essential" type lens I should look for (which would be around the $250 range)?


Thanks for any help.
The 8mm fisheye would be nice if you have a real use for it. IMHO the 35mm f2.4 is a better buy. I sold mine to make way for teh DA40 LTD but I do miss it every now and then.
11-22-2012, 03:19 AM   #8
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They all sound like good choices to me. I certainly enjoy my DA10-17 fisheye.

Perhaps the Tamron 17-50/2.8 would be a good option too.

As far as the DA35/2.4 goes in low light, I wouldn't worry about it too much. Since it was originally designed as an f/2 lens (as the FA35/2), it has very good IQ wide open, so speed-wise - in actual use - it's almost as good as an FA43, for example.

11-22-2012, 04:42 AM   #9
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Choosing?

Hello Mojoe,
A couple of suggestions for you, before you go shopping;
Take a look at your favorite photos, the ones YOU like best. What range of view (focal length) do you favor? If you use the widest end of the 18-55mm quite a bit and even then would like a wider FOV, the 8mm might be the ticket.
But, if you find a preference for the "normal" FOV (35mm on digital, 50mm on film), the DA 35mm would be a better choice for a first A/F prime.
If you're leaning towards the 35mm, this thread may help you decide. Some fine examples of what this lens can do!
https://www.pentaxforums.com/forums/lens-clubs/196639-da35-f2-4-plastic-fantastic-club.html
Ron
11-22-2012, 05:11 AM   #10
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As above, buy the lens you know you will use and therefore appreciate more.
11-22-2012, 05:38 AM   #11
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QuoteOriginally posted by mojoe_24 Quote
I was leaning towards the 35 more than the 50 because I've ran into difficulties with the 50 in doors when using it, but the 50 should be better in low light, correct?
Not necessarily.

The wider the lens,
the lower the shutter speed can be
before you start to see some blur.

So although the DA 50 is about a stop faster than the DA 35,
you can compensate that by using twice the exposure time with the DA35.
11-22-2012, 02:06 PM   #12
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Well, at the exposure time, the 50 should be better.
11-23-2012, 12:10 AM   #13
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QuoteOriginally posted by mojoe_24 Quote
Well, at the exposure time, the 50 should be better.
Looked at that way, no.

With a fixed low shutter speed (say from Tv mode),
a photo taken with the 50 will be more likely to show blur
than a photo taken with the 35.
11-27-2012, 02:31 PM   #14
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Just put in the order for the Rokinon 8mm.
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