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Forum: Pentax Full Frame 11-24-2018, 12:23 PM  
are you happy with switching to FF?
Posted By Tranzistors
Replies: 392
Views: 44,208
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Forum: Pentax Full Frame 11-15-2018, 08:37 AM  
are you happy with switching to FF?
Posted By Tranzistors
Replies: 392
Views: 44,208
Yes, macro photography is a special case, where smaller sensor is a direct benefit for extra close up. I think this conversation can be summarised to “Ask your doctor, if full frame is right for you”.
Forum: Pentax Full Frame 11-15-2018, 07:36 AM  
are you happy with switching to FF?
Posted By Tranzistors
Replies: 392
Views: 44,208
I think you have misinterpreted me. When I talk about resolution drop off, I don't mean that the sensor is to blame, but rather the sensor-lens combo. If you have a razor sharp D-FA 50mm at f/2, moving from 16 to 24 MP on APS-C will probably give you about 33% more detail. However, if you have a pinhole camera, those extra megapixels on the same surface won't give you much more detail, but increased surface will.

That is to say, if a lens is not super sharp, but is about as sharp in the centre as it is in the corners, you can get more details out of a picture by moving from APS-C to FF and keeping pixel density, rather than increasing megapixels on the APS-C. However, that if is a big if. Lenses tend to be noticeably sharper in the centre. I have not seen any studies of FF Pentax lenses in this regard. It is perfectly possible that for a same FF lens K-3 will give more detail than K-1, I just suspect that 35mm f/2.4 and 100mm f/2.8 macro will give more detail on K-1.
Forum: Pentax Full Frame 11-14-2018, 07:14 AM  
are you happy with switching to FF?
Posted By Tranzistors
Replies: 392
Views: 44,208
Technically true. But at least in my photography I often crop half of the image away, for example, if I see that a background is too distracting, I will crop a landscape portrait into a portrait portrait. This can easily make a 36mp image into a 16mp image. You might argue that a 16mp “should be enough for everybody”, but lenses tend not to be super sharp, so those 16mp images can easely turn into effective 8mp images. And 8mp essentially are 4K screen size.

Having a 24mp APS-C will not help in any way. I suspect that effective megapixels will even be lower for APS-C for the same lenses.
Forum: Pentax Full Frame 07-24-2018, 11:22 PM  
are you happy with switching to FF?
Posted By Tranzistors
Replies: 392
Views: 44,208
Depends. My K-1 has the same pixel pitch as my K-5ii camera†. That means that for the same lens, FF is more demanding on the corners than APS-C. A 36MP APS-C sensor would be much more demanding on the centre performance of the lens and corners could be freely ignored. Frankly, I have no idea which kind of lens would be easier to make. It's a shame that falconeye (Falk Lumo) is not around PF much these days, since he wrote at length about technical issues concerning FF and APS-C systems.

† Side note, the pixel pitch for 645Z is ever so lightly lower than K-1.
Forum: Pentax Full Frame 07-23-2018, 10:51 PM  
are you happy with switching to FF?
Posted By Tranzistors
Replies: 392
Views: 44,208
Tell that to my DA 50mm F/1.8. Even DA 40mm F2.8 Ltd. holds well on FF. My guess is that full frame is considered a thing for professionals, where demands on build and image quality are greater, which is is achieved by sacrificing weight.

Another reason for perceived weight increase is unfair comparisons for equivalent lenses. E.g. 70-200mm on FF is roughly equivalent to 50-135mm on APS-C. But F/2.8 on FF is about F/2 on APS-C and zooms tend to not have F/2. Pentax DA* 60-250mm F4 is full frame glass, and it is not that heavy, thanks to F/4. On APS-C, equivalent would be about 40-170mm F/2.8, which I doubt would be much lighter.
Forum: Pentax Full Frame 06-27-2018, 07:53 AM  
are you happy with switching to FF?
Posted By Tranzistors
Replies: 392
Views: 44,208
Well, full-frame camera allows me to stand closer to the subject, which makes conversations with them less awkward. You heard it here first, folks: FF cameras improve your social life. :lol:
Forum: Pentax Full Frame 06-25-2018, 12:27 PM  
are you happy with switching to FF?
Posted By Tranzistors
Replies: 392
Views: 44,208
In my experience bigger/brighter viewfinder reduce composition mistakes. For studio work perhaps this doesn't matter, but in the field every detail helps. Maybe it's just me.



That is true, but the extra sensor area buys you reduced overall image noise (not per-pixel noise) and thinner DoF.



For a well controlled studio work, shooting at F8, there really is no reason to move to full-frame. Even μ4/3 will do just fine.
Forum: Pentax Full Frame 06-25-2018, 07:36 AM  
are you happy with switching to FF?
Posted By Tranzistors
Replies: 392
Views: 44,208
To throw in my 2¢, FF has one seldom mentioned advantage: bigger/brighter viewfinder. My upgrade to K-1 was bitter sweet — while it was better than my K-5, it still can't hold candle to Pentax ME (which I still have, just to ruin joy from my camera purchases).

While the camera is noticeably heavier, I can't agree that the whole system is much heavier, because the lenses are not directly comparable. E.g. DA* 16-50mm F2.8 (565g) equivalent is D FA 24-70mm D2.8 (787g), but the latter gathers one extra stop of light. 200mm F2.8 on APS-C and 300 F4 on FF, where the weight increase is 30%, which is noticeably more. My point is, light-gathering power is what FF is good at and increased weight of the FF comes with increased light-gathering power. I wonder if the upcoming 70-200mm F4 will weight about as much as DA* 50-135mm F2.8.
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