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03-15-2019, 06:06 AM   #1
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Which AF 50 on the K-1?

I just won a K-1 and am waiting on its arrival. I currently have 3 AF 50 lenses and am wanting to offset some of the expense of the incoming K-1. If its a keeper I'll be selling my K-3, K-01, and a Q to offset cost but I really can't justify 3 50mm FF lenses.


So, among my AF lenses fit for use on a FF camera I have the FA50/1.4, F50/1.7, and F50/2.8 Macro. Of these which would you keep for use with the K-1, and why?

03-15-2019, 06:12 AM - 1 Like   #2
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Figure out which one or two are the sharpest when you get the K-1 with real tests. The 36mpix sensor is very demanding on lens resolution.

There were some excellent 50/1.7 lens, and some copies that werent as good. I've seen some 1.4s worse than the 1.7.

You might want ot keep the macro for fun.
So best bet is to do some resolution tests.
03-15-2019, 06:39 AM   #3
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Probably of those, the Macro is the best one. I would consider a DA *55 or FA 43 depending on the results you get from it.
03-15-2019, 06:58 AM   #4
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The F-50 macro will be better edge to edge if you like that. I like the DA*55 on the K-1 as my favourite K-1 prime. But to me, the camera doesn't pull it's weight until you get a 28-105.

I go out with my DFA 28-105, and DA* 200 with 1.7x Apapter and I'm ready for just about anything. I also have the Rokinon 14 2.8 for ultra wide images, but it doesn't get out much. But when you want it, it's critical. The third lens in the bag will usually be the DA*55, and it often gets used as my walk around lens until circumstances require the 28-105 or 200.

03-15-2019, 08:57 AM   #5
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Sell all and buy the Fat Fifty DFA*50....

The K1 sensor maybe could be as demanding as the K3 sensor, but now you will going to use thw whole circle and maybe they wont cut in the corners, other option can be the DA*55

The answer will be test all the 50 and look what lens is sharper at maximun aperture.
03-15-2019, 09:07 AM   #6
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Hi Robert

You've given yourself a new rabbit hole.
If you need to sell stuff why buy in the first place. ( I know silly question ).
More money get the 28 - 105 and then test the rest and then decide

Dave
03-15-2019, 09:13 AM   #7
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I have both the FA 50 1.4 and the F 50 1.7 ... I prefer the FA 50 1.4 by miles!
Mostly for the colour rendition, character, and and pop!
Haven't put them through the wringer on sharpness, but that's somewhat less important feature for me - as long as they are acceptably sharp.
Also, I'm using these on aps-c...
03-15-2019, 10:23 AM   #8
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QuoteOriginally posted by Docrwm Quote
Of these which would you keep for use with the K-1, and why?
The F 50/1.7 is probably the sharper of your two fast 50s, though the f/1.4 (obviously) does have its fans. Unless you need 1:1, definitely keep the macro.


Steve

03-15-2019, 10:41 AM   #9
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I have F 50 / 1.7,I use it on K1, I use it and in combination with AFx1.7 = 85 / 2.8, my recommendation for F50 / 1.7 if the sharpness at the nominal aperture is the most important, or how he says stevebrot:"though the f/1.4 does have its fans-unless you need 1:1, definitely keep the macro."

Last edited by mbukal; 03-15-2019 at 10:53 AM.
03-15-2019, 01:30 PM   #10
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QuoteOriginally posted by normhead Quote
I go out with my DFA 28-105
I am with you. Ever since I got the 28-105, my 43, 31 and 77 do not see much action unless I have to shoot at or near F2 for shallow depth of field. I wish Pentax made a 20-40 type lens for FF or perhaps a 24-120 like most other brands. That would be a nice jack-of-all-trades lens.
03-15-2019, 02:42 PM   #11
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You have the lenses still, and you will have the camera soon. Test them all under the circumstances you would use them.

IF AND ONLY IF you seldom shoot the faster ones wider than 2.8, there is a case for holding onto the Macro as it is the most flexible of the lot. On a different level, I have a Spotmatic F that I sometimes take for a walk in good weather with colour film. Because I never know when I'm going to run across a flower or a bug that catches my eye, I bought an S-M-C-Takumar 50/4.0 for it as the walkaround lens because I'll never need f/1.4 for low light but I could need very close focus.

But first, determine for yourself which of your fifties is BEST BY TEST for the sort of shooting YOU do.
03-15-2019, 03:31 PM - 1 Like   #12
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Wow, thats a tough one. Do you have another macro? If you don't and you have a need for a macro then thats a plus for the macro.

Otherwise the other 2 are worth considering.
Currently 50ish lens I have collected over many years and tried on my K-1, I have tried: FA 50 f1.4,, M 50 f1.4, A 50 f1.4, A 50 f1.7, M 50 f1.7, Super Takumar 50 f1.4, Super Takumar 55 f1.8, Helios 44-4 58mm f2 and just got a FA 43 f1.9 Limited.
Its about time I move some of them on to a better home too.

They are all great in there own way but of those the ones I definitely hanging on to (roughly in order):
1. FA 43 - Only just got it but impressed with what I'm seeing in the first shots and its small enough to always carry!
2. FA 50 f1.4. Find it performs pretty well in most regards at f2 (where I mostly use it) and having the f1.4 aperture can be handy. At f2 its almost identical to my A 50 f1.7 at f2. Performance is a tiny better than the older f1.4s I have. Love the compact size for an AF lens too (so its often in my bag). On the negative side I'm not a huge fan of the bokeh at f1.4 (especially in transition zones) but much improved by f2 IMO.
3. Super Takumar 50 f1.4. Like the bokeh and rendering wide open.
4. Would be reluctant to get rid of Helios too as has a pretty interesting rendering.

Obviously the HD FA* 50 f1.4 is a wonderful performer but in all honesty it just too big, heavy and expensive for me at the moment.
03-15-2019, 04:15 PM   #13
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QuoteOriginally posted by kiwi_jono Quote
Wow, thats a tough one. Do you have another macro? If you don't and you have a need for a macro then thats a plus for the macro.

Otherwise the other 2 are worth considering.
Currently 50ish lens I have collected over many years and tried on my K-1, I have tried: FA 50 f1.4,, M 50 f1.4, A 50 f1.4, A 50 f1.7, M 50 f1.7, Super Takumar 50 f1.4, Super Takumar 55 f1.8, Helios 44-4 58mm f2 and just got a FA 43 f1.9 Limited.
Its about time I move some of them on to a better home too.

They are all great in there own way but of those the ones I definitely hanging on to (roughly in order):
1. FA 43 - Only just got it but impressed with what I'm seeing in the first shots and its small enough to always carry!
2. FA 50 f1.4. Find it performs pretty well in most regards at f2 (where I mostly use it) and having the f1.4 aperture can be handy. At f2 its almost identical to my A 50 f1.7 at f2. Performance is a tiny better than the older f1.4s I have. Love the compact size for an AF lens too (so its often in my bag). On the negative side I'm not a huge fan of the bokeh at f1.4 (especially in transition zones) but much improved by f2 IMO.
3. Super Takumar 50 f1.4. Like the bokeh and rendering wide open.
4. Would be reluctant to get rid of Helios too as has a pretty interesting rendering.

Obviously the HD FA* 50 f1.4 is a wonderful performer but in all honesty it just too big, heavy and expensive for me at the moment.
Funny, I forgot to mention the FA43 LTD. So, in 50ish, I have the following on hand:

SuperTak 50/1.4
SuperTak 55/1.8

M50/2, 1.7, & 1.4
M50/4 Macro

A50/2

F50/1.7
F50/2.8 Macro

FA50/1.4
FA43 LTD

So, 4 AF and 7 MF in the 50ish range (43-55)
03-15-2019, 07:11 PM   #14
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With a nearly identical set of lenses (plus the Fat Fifty and the 50/1.2’s) I ranked my choices:
  • DFA28-105. I bought the K-1 and kit zoom together. The IQ and utility of that lens is compelling. You don’t really need a dedicated 50 for most things.
  • FA43
  • F50/1.7
  • FA50/2.8 Macro
  • Any of the manual 50’s
  • FA50/1.4
I’ve had the 50/1.4 new since 2006 and bought the 50/1.7 after a professional CLA. I think I have a good copy of the F50/1.7 and a so so copy of the FA50/1.4. I think it’s OOF transitions are busy and it flares. I use an M50 hood with it. If I want the film era promotion of the central subject and nice OOF backgrounds I have plenty of options better than the FA50. If I want sharpness across the frame I have the flat field 1.7 and the Macro, so the FA50 has been stored in its box for years.

And now there’s the DFA50.
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