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12-31-2010, 02:03 PM   #16
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QuoteOriginally posted by Ira Quote
Could not disagree more, and don't know where you came up with this stuff.
Reading the article in the first post helps to understand...or reading through the lens reviews...or doing my own observations...

And having used a few (ok, lots of) copies of various Pentax 50s and uncountable other 50s, I never found the desire to go to the M 50/1.4 instead of a 50/1.7. More money, bigger, heavier, not much better optical performance.

12-31-2010, 02:10 PM   #17
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QuoteOriginally posted by Frogfish Quote
Funnily enough today I was just running comparison shots between my FA 50/1.4 and 43 Ltd (hey - I see people talking about the 55 so the 43 is only an extra 2 mm the other way) !
Can you explain your math to us?
12-31-2010, 02:57 PM   #18
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QuoteOriginally posted by Ira Quote
Can you explain your math to us?
I might as well do that. 50 to 55mm is a difference of 5mm. 43 to 50mm is a difference of 7mm. 7-5=2 . I was a bit confused the first time I read the post as well.
01-01-2011, 01:12 PM   #19
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QuoteOriginally posted by Pentaxor Quote
I'm considering an FA31. tomorrow, I'll be renting both FA43 and FA31 just to confirm some issues I'm having with focal length and busy bokeh. if the FA43 would suffice, then I'll go for it and say goodbye to both my FA35/2 and FA50/1.7.
Get both!
I know I told you this few times, but I really don't think you'll regret. 43 is sharper wide open than just about anything I've tried (although 55/1.4 and 50/1.7 were not too far off) and the busy OOF comes and goes. If you know your stuff you will know when not to use the lens to avoid it and even then, it's not that bad. Honestly, I think 43 wide open has better OOF then DA*55

01-01-2011, 01:21 PM   #20
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QuoteOriginally posted by macTak Quote
I might as well do that. 50 to 55mm is a difference of 5mm. 43 to 50mm is a difference of 7mm. 7-5=2 . I was a bit confused the first time I read the post as well.
Thanks! Now I understand the meaning of the post!
01-01-2011, 04:26 PM   #21
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Spock, to come back to your starting question, I think it depends what you want to use them for. Generally speaking I see a permanent cleft between laboratory/industrial photography and its conclusions vs. photography applied in different photographic genres and its conclusions.

Axl,
thanks a lot for the insights.

Nesster, your collection of data and presenting it in this way is really nice. Because of those two tables you have posted I can finish my (admittedly grumpy) sensor width measurements as there are 2 or 3 lenses in there that I have and they measured the true focal length in these tests, as well as the true f- and t-stop.

Which 50 is better ? You might as well let the pictures do the talking.

Best, Georg
01-03-2011, 12:51 AM   #22
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QuoteOriginally posted by Ira Quote
Originally posted by Frogfish*
Funnily enough today I was just running comparison shots between my FA 50/1.4 and 43 Ltd (hey - I see people talking about the 55 so the 43 is only an extra 2 mm the other way) !
Can you explain your math to us?
Sorry if my explanation wasn't that clear - it was in my head !

Since the 43 is so sharp there is absolutely no issue cropping to your preferred FL if you wish - I love the 43 and find that the extra width is perfect in many instances where a 50 would be too close.
03-14-2017, 08:16 PM   #23
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Yes the slower lenses are generally sharper than the faster lenses. This excludes things like bokeh etc and addresses just sharpness. Optical compromises have to be made to allow the faster/bigger aperture. At one point in the past Leica trumpeted that their updated Summilux f1.4 lens was finally almost as sharp as the f2.0 Summicron.

03-14-2017, 08:37 PM   #24
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Took me a while to realize this was a zombie thread come to life more than 7 years after the original post. No wonder I got a 404 response when I tried to click on the Adorama link in the first post.

There are more issues than just sharpness. The Pentax f1.2 50mm has surrealistic bokeh, it's your go to lens if you want to emulate Salvador Dali. At less than f2, depth of field is so shallow, sharpness is a moot point, what people will notice is colour, contrast, saturation and the look of out of focus areas. Sharpness is just a matter of nailing focus. There are handling differences based on size of the lens and length of focus throw. The DA 50 f1.8 may be similar optically to the A 50mm f1.7, but manual focus is a completely different experience. At f2.8 or narrower, they should all be sharp.
03-14-2017, 09:26 PM   #25
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I don't remember seeing this when it was first posted. Those lens tests are interesting: even back then, Pentax apparently had decentering issues. I hadn't thought that was such an issue with primes, but maybe it was/is.
03-14-2017, 09:40 PM   #26
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QuoteOriginally posted by RGlasel Quote
.....................I got a 404 response when I tried to click on the Adorama link in the first post.

The Adorama article moved here:

50mm Lens Shoot-Out: f/1.8 or f/1.4? | Expert photography blogs, tip, techniques, camera reviews - Adorama Learning Center
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