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06-06-2021, 04:43 AM   #16
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QuoteOriginally posted by leekil Quote
It seems to have a lot of CA/purple fringing on the water in that canoe photo. Is that common?
QuoteOriginally posted by Bertrand3000 Quote
Did you use some kind of filter, or post-processing to get those effects?
The right part of the scene was in deep shade and I had to "open up the shadows" a little. Stars are natural and no filtration was used. Maybe a quirk from the post-processing software ...

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06-07-2021, 05:30 AM   #17
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QuoteOriginally posted by TwoUptons Quote
I've found the F series lens to be really annoying.
They are ugly
I sooooo disagree!
06-07-2021, 09:18 AM   #18
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QuoteOriginally posted by TwoUptons Quote
I've found the F series lens to be really annoying.
They are ugly, and the ergonomics are terrible.
Some of them are not very well built and occasionally come apart catastrophically despite no apparent damage.
But then it turns out some of them are quite good, optically.
Even some of the cheap ones...
The couple I still have I am quite fond of.

-Eric
QuoteOriginally posted by bdery Quote
I sooooo disagree!
I don't agree either, I have F28 / 2.8 and F50 / 1.7 and they are visually nicer (not just plastic) and optically better (sharper on the nominal aperture) than FA28 / 2.8 and FA50 / 1.7, I compared the series FA in trying to replace it with series F, but after a parallel comparison gave up and I stayed with the F series (and because of the more metal body and because of the sharpness on the nominal apertures-but that's just my opinion that I convinced myself)




Last edited by mbukal; 06-07-2021 at 11:56 AM.
06-07-2021, 01:50 PM   #19
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The F and FA 50 mm f/1.7 are identical optically and should perform equally well. The optical layout of the F and FA 28 mm f/2.8 are totally different. Both versions give wonderful images. Personally, I have both FA versions and am totally satisfied.

FA 50 f/1.7

FA 28 f/2.8



Last edited by RICHARD L.; 06-16-2021 at 03:29 PM.
06-07-2021, 02:11 PM   #20
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If "cheap" is a criteria in choosing a Pentax 28-80mm, look for an FAJ as supplied with the *ist film camera!
Lightweight (180gm), 'plasticky' (including the mount) and an overpriced "optional" lens hood, but really quite good!
Often available for around 40 on eBay.uk
06-16-2021, 03:03 PM   #21
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Given the high price of FF zooms I appreciate all of the good alternative suggestions here. I opted to go with the DA 20-40 Limited in APS-C mode on my K-1 II.
07-17-2021, 03:19 AM   #22
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QuoteOriginally posted by victordeamorin Quote
exposing these zooms' weaknesses made me want to get the DFA 28-105 more
Hello all,

Obviously, after posting that, LBA could not be controlled, so I had to get a D FA 28-105mm from a fellow PF member (thanks again!)
Therefore, here is a quick update to this thread adding the comparison to this newer lens:

1) I compared the D-FA to the FA 28-70 from 28 to 50mm (the range where I had found it superior to the F previously, if you follow) at all apertures and the conclusion is clear: the D-FA is superior (or at least equal) to the FA in all situations. The main drawbacks of the older lens are higher softness and lower contrast (at f/4-5.6), and excessive aberrations (especially PF at f/11-16). Their rendering are close in the sweet spot around f/8, with similar colours.

2) When I compared the D-FA to the F 35-135 from 70 to 105mm (where the F shines), the conclusion is more surprising: the F can't be beaten. In fact, that 35-year old lens is sharper at large apertures (f/5.6) and without noticeable defects. The newer lens has to settle for a close second place, although the difference in IQ is generally very thin (both are very sharp and good from f/8 on). The main thing setting them apart is color rendition: once again, the F has a distinct warm/yellow cast while the newer D FA is more neutral.


In general conclusion:

- if you don't mind its look, weight and noise, the F 35-135 can be used without reservations from 70 to 105mm. It is also the only one to extend to 135mm. However, it should be avoided below 50mm.
Of course, in the limited range where it shines, it could be advantageously replaced by a nice 85 or 100mm prime, which might be my next purchase (my A-series is very good but not macro, not AF and not WR)

- the cute FA 28-70 is mostly useful for its compactness, lightness and overall discretion. There are definitely use cases for that (hiking, street,...). As drawbacks, its IQ is lower (not helped by the lack of a hood) and it is the shortest of the 3 at only 70mm. It remains very usable from 28 to 50mm IMO.

- at the end of the day, the D FA 28-105 is really the best proposition all-around if only one could be kept: unmatched versatility, very homogenous IQ across the range, silent DC AF, WR, and auto corrections available in-body and in LR. All that while remaining lighter than the F.


Will I be parting with some of these? Well, maybe but not right now. Let's give it some time and see if the F and/or FA manage to come back to my K-1's mount. It will be tough getting that D FA to detach though. They will have to sneak in between when the primes get some use.
There isn't much money to get back from the F and/or FA, maybe 80-100 in total, maximum; but I like to keep a limited, clean and rationalised collection of lenses that I actually use
If anyone is interested to see more of my backyard and draw their own conclusions, please say so and I'll upload the complete set...

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