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Forum: Pentax SLR Lens Discussion 07-19-2018, 08:51 AM  
Why would somebody buy the DFA28-105?
Posted By mcgregni
Replies: 104
Views: 6,976
The OP seems to be perpetuating his automatic assumptions that every Limited Prime lens is 'better' then the D FA28-105. Well, I don't understand that assumption ..... those are rather old lenses, and to stack them against the latest Pentax optical and design technologies is bound to disturb the "expected". In a direct exact shoot-out with the same settings then I think there would be a range of outcomes, with different eyes picking out different lenses as the better one. I would expect the D FA 28-105 images to come out strongly.


Of course, as Normhead and others have been saying, if you have a technical / creative need for wider apertures, lighter, smaller etc, then the primes win out. Also if their creative rendering is a personal preference and you know how to employ it in practice. But that is specific to the situation and I believe, the skills of the photographer. A straight technical shootout is going to bring mixed results, considering the differing ages of the optical technologies.


Have you considered the DC autofocus aspect as well? For me it is one of the main advantages of using the D FA zoom, particularly for my portraits at the long end. So instant and quiet, plus the quickshift is superb (the ring is near the camera mount, very easy to use). The FA Limiteds fall short in these aspects.
Forum: Pentax SLR Lens Discussion 07-18-2018, 01:20 PM  
Why would somebody buy the DFA28-105?
Posted By mcgregni
Replies: 104
Views: 6,976
Here's one where I was trying to show the close focus and bokeh ….both things that surprised me when I first got the D FA28-105.

Attachment 412381

I don't know many f3.5-5.6 zooms that can make photos like that.
Forum: Pentax SLR Lens Discussion 07-18-2018, 09:41 AM  
Why would somebody buy the DFA28-105?
Posted By mcgregni
Replies: 104
Views: 6,976
Once you chop the size of the image down to that for the KP, I guess that's right...... My maths is not that good , I'll take your word for it!

I think the reality is that very few people would actually need such resolution..... Only those who will order large physical prints (bigger than A3 ...?-), or still need to crop in even more than than aps-c size. The vast majority of us frankly don't need more than a K7 or K5 resolution.
Forum: Pentax SLR Lens Discussion 07-18-2018, 07:14 AM  
Why would somebody buy the DFA28-105?
Posted By mcgregni
Replies: 104
Views: 6,976
It would look the same on screen, yes. The cropped image would have resolution similar to a K5, so if you don't need more res than that you may not need an aps-c camera as well. However many do want higher resolution than K5, and so they choose a K3 over a K1 .

The main plus here is being able to fill their frame with the subject (typically wildlife, aeroplanes, sports, those sorts of things), and to do that needs less focal length/smaller lenses than doing the same on the K1. But you'd have to actually need the K3 resolution to make that a true technical advantage over using the K1 and cropping.
Forum: Pentax SLR Lens Discussion 07-16-2018, 04:38 PM  
Why would somebody buy the DFA28-105?
Posted By mcgregni
Replies: 104
Views: 6,976
Its fits nicely on the K7 .....


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