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04-27-2012, 11:33 PM   #1
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Worth it to upgrade to FA 50mm f1.4?

I have the SMC-FA 50mm f1.7 lens, and I love its low-light performance and quick auto-focus.... however, the 1.4 *is* faster. Does that half stop make it worth upgrading to? Or am I better off just keeping my 1.7?

Charles.

04-27-2012, 11:46 PM   #2
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if you dont mind getting a slightly softer image at wide open in exchange for that half of a stop, then go for it. personally, i would just stick with the one you got now and save up for a k-5 if i were in your shoes.
04-28-2012, 12:02 AM   #3
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They say that the 1.4 is slightly sharper at 1.7 compared to a 1.7 at wide open(I think this goes for most of the lenses). Anyway If you want to get a 1.4 then go for it (: And then I'll buy your 1.7 off of you.
04-28-2012, 12:05 AM   #4
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Funny thing is you'll probably be able to get more for the f1.7 than it will cost to buy a 1.4. I have both and I've found the 1.7 to be sharper for some reason, but that's just my impression.


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04-28-2012, 12:09 AM   #5
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FA @ 1.4 was quite soft for me.
F (almost identical to FA) 50 1.7 @ 1.7 was quite sharp.
If it were me, I would choose to stay with F/FA 1.7 instead of paying the extra money for the 1.4.
I found what Adam said to be true.
04-28-2012, 12:58 AM   #6
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Hood with the 1.4 ... ?!

Bonjour,

Just my "deux centimes" worth ... if you do get the 1.4, maybe use a hood with it. There was a user review which stated how the use of a hood improves upon the sharpness of this lens (see first review of SMC Pentax-FA 50mm F1.4 Reviews - FA Prime Lenses - Pentax Lens Reviews & Lens Database ) ... which would make some sense to me.

I mention this because I am interested in this lens and/or the new DA 50mm f1.8 which will be out soon ... I have a SMC A 50/1.7 which is great, but would like to have a "fast" AF lens

Has anyone seen any improvement with the use of a hood? Just curious ... et merci.

Allez et bon courage, John le Frog
04-28-2012, 01:00 AM   #7
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QuoteOriginally posted by Jean Poitiers Quote
Bonjour,

Just my "deux centimes" worth ... if you do get the 1.4, maybe use a hood with it. There was a user review which stated how the use of a hood improves upon the sharpness of this lens (see first review of SMC Pentax-FA 50mm F1.4 Reviews - FA Prime Lenses - Pentax Lens Reviews & Lens Database ) ... which would make some sense to me.

I mention this because I am interested in this lens and/or the new DA 50mm f1.8 which will be out soon ... I have a SMC A 50/1.7 which is great, but would like to have a "fast" AF lens

Has anyone seen any improvement with the use of a hood? Just curious ... et merci.

Allez et bon courage, John le Frog
I did not have a hood when I owned FA 50 1.4 and did have one (but seldom used) with F 50 1.7- it could have possibly played some role in it.
I don't have either of them any more so I cannot go and try to test this in any way.
04-28-2012, 01:07 AM   #8
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Merci

QuoteOriginally posted by Julie Quote
I did not have a hood when I owned FA 50 1.4 and did have one (but seldom used) with F 50 1.7- it could have possibly played some role in it.
I don't have either of them any more so I cannot go and try to test this in any way.
OK, thanks Julie ... Salut, J Frog


04-28-2012, 03:21 AM   #9
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I wouldn't call that an upgrade.
04-28-2012, 05:19 AM   #10
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IMHO keep the f1.7.
04-28-2012, 06:07 AM   #11
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The DA*55 beats the pants off the FA50/1.4 for IQ, but until I am convinced the former will work reliably (already sending copy #1 back for replacement) I will be holding onto the latter.

Stick with your FA50/1.7 for now.
05-02-2012, 08:52 AM   #12
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Okay. My 1.7 does have some softness wide open, and rather a bit of purple fringing too, but I do love it. Maybe I'll skip the whole idea of a 1.4 entirely and snag the new XS pancake instead. It's a good price and would make my K-x almost pocketable...

Charles.
05-02-2012, 11:22 AM   #13
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I don't have the FA50 1.7, but I would be surprised if my FA50/1.4 were softer at 1.7, and I am very happy with the sharpness of the 1.4 when stopped down a couple of stops. I also find that the FA50/1.4 is far and away the most accurate at focus in low light--sometimes better than my manual focus with the faster Kiron 50/1.2.
05-02-2012, 11:58 AM   #14
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It wouldn't be an upgraade; rather it would be an exchange of quality lenses to meet a different need. From many years of reading and some reviews in the Forums here:
The Pentax f/1.7 / f/1.8 50 / 55 lenses were optimized for sharpness across the entire image plane at a time when cameras were used on a macro stand to photogrpah flat objects for reproduction. The f/1.4 50's were optimized for a more pleasing OOF area at open aperture and were softer at the edges on purpose. Reportedly by f/5.6 and certainly by f/8 both lenses were very sharp.

Your FA50/1.7 is a wonderful, somewhat rare lens that is intentionally sharp across the entire image plane wide open. The FA50/1.4 is a different lens, made for a different purpose - also a wonderful lens for its purpose. Unless you have the wrong lens for your needs, keep the 50/1.7. If you need the additional stop for DoF there's a plethora of available options including manual focus to try first before you sell your lens..
05-02-2012, 01:53 PM   #15
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QuoteOriginally posted by ChopperCharles Quote
I have the SMC-FA 50mm f1.7 lens, and I love its low-light performance and quick auto-focus.... however, the 1.4 *is* faster. Does that half stop make it worth upgrading to? Or am I better off just keeping my 1.7?

Charles.
Just to clarify, you have both the FA 50 f1.7, and the F50 f1.7 mentioned in your signature ?
If that's the case, they are both very similar optically and as many have pointed out, the FA f1.7 is quite rare and should you want to sell that, am sure you can get a decent return for it.

I have the F50 f1.7 and find myself reaching for it all the time, even more than the DA40.
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