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View Poll Results: Would you buy a Pentax Full Frame DSLR?
Yes 15277.95%
No 4322.05%
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04-20-2013, 05:14 PM   #106
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QuoteOriginally posted by lesmore49 Quote
back in the film days...6X7, 645
Proper FF cameras.

04-20-2013, 06:42 PM   #107
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QuoteOriginally posted by kerrowdown Quote
Proper FF cameras.
Yes. I fondly remember the Pentax 6 X 7...a wonderful camera. BTW, I see you're from the shores of Loch Ness. My wife's family on her father's side are from a bit north of Loch Ness...Dingwall.
04-20-2013, 07:01 PM   #108
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QuoteOriginally posted by lesmore49 Quote
a bit north of Loch Ness...Dingwall
Aye, right enough just 1/2 hour away or so, in fact I took this shot just outside the new cattle auction mart at Dingwall recently.

https://www.pentaxforums.com/forums/attachments/post-your-photos/166781d13652...sis-drover.jpg
04-21-2013, 09:33 AM   #109
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QuoteOriginally posted by kerrowdown Quote
Aye, right enough just 1/2 hour away or so, in fact I took this shot just outside the new cattle auction mart at Dingwall recently.

https://www.pentaxforums.com/forums/attachments/post-your-photos/166781d13652...sis-drover.jpg

Thanks for the lovely photo...both my wife and I enjoyed seeing it. We have been to the Loch Ness area and it's absolutely stunning. My ancestors (Mac Leod) were from the Isle of Skye.

04-21-2013, 11:16 AM   #110
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I have my full frame Pentax .
04-21-2013, 02:33 PM   #111
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Great; can you borrow and test Pentax lenses for FF-compatibility? (I know SR won't be factored in with that camera). You would do us a great service
OTOH, in your place I don't think I would go with such a difficult task.
04-21-2013, 06:27 PM - 1 Like   #112
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With the release of the Sigma 8-16mm, FF has no appeal for me. Pentax' highest-quality APS-C with a tilt-swivel screen would create an instant vacuum in my wallet.
04-21-2013, 07:52 PM   #113
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QuoteOriginally posted by ElJamoquio Quote
That depends. The K-5 with a limited prime is quite small, but those who start from a 7-D and 17-55 would see a size reduction going to the 6-D and 24-105 f/4.

We can't really predict how much smaller the FF lens any APS-C lens would be on FF, or how much bigger (or smaller) the camera is going to be. In any case, though, everyone should realize FF isn't going to be bigger than APS-C for much longer - bigger cameras are not a requirement of FF, and most lenses between 24mm and 70mm (equivalent) are smaller on FF. Above 70mm you can crop on FF.
Picking one of the larger camera and standard zoom combos isn't really a good counterargument. I'm really not buying your argument that lenses for FF can be smaller than an APSC designed lens.

04-22-2013, 04:48 AM   #114
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QuoteOriginally posted by abacus07 Quote
Picking one of the larger camera and standard zoom combos isn't really a good counterargument. I'm really not buying your argument that lenses for FF can be smaller than an APSC designed lens.
On the camera side, It's really more of a market problem than a technical problem. There's not a lot of reason a FF camera would be larger than an APS-C camera, aside from the prism.


On the lens side, the top three scenarios, in order:

1. Most of the time (90%?), the 'same' or 'similar' lens does not exist for both APS-C and FF. My posit is that this is a market problem. There's a 15mm F/4 APS-C lens but there's no 23mm F/6 full-frame lens.
2. Most of the rest of the time (9%?), of two nearly-equally-capable lenses, either...
2A) the FF lens is smaller, lighter, and cheaper than the APS-C
2B) for the longer focal lengths, you can crop the FF, and the lenses by definition are equal in size
3. I've actually never seen two nearly-equivalent lenses where an APS-C lens is smaller, lighter, and cheaper, but I'll say I haven't researched every lens, either.

What lens are you thinking of, that wouldn't be smaller on FF than on APS-C?
04-22-2013, 05:39 AM   #115
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QuoteOriginally posted by ElJamoquio Quote
What lens are you thinking of, that wouldn't be smaller on FF than on APS-C?
I don't think there are any 105 mm lenses that are comparable to the DA70 in size... But of course if the mythical Pentax FF solves the "crop mode" problem in an elegant way, the DA70 may still be very usable (I'd prefer less-than-1.5x crop for that lens since it seems to be almost FF compatible).
04-22-2013, 05:53 AM   #116
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QuoteOriginally posted by gazonk Quote
I don't think there are any 105 mm lenses that are comparable to the DA70 in size... But of course if the mythical Pentax FF solves the "crop mode" problem in an elegant way, the DA70 may still be very usable (I'd prefer less-than-1.5x crop for that lens since it seems to be almost FF compatible).
The DA70 is reported as pretty-close-to-full-frame if not full-frame. If true, the 70mm on FF would be like a 'digital zoom' similar to a APS-C zoom from 46-70mm F/1.6-2.4. (FF 70-106mm F/2.4-3.6).

That sounds like an awesome lens to me.

I am *not* aware of a 105mm F/3.6-ish lens that's not a macro. I would expect that lens to be larger than the 70mm, though.
04-22-2013, 06:26 AM   #117
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XS 40, 21 ltd. 15 limited are all smaller than their FF counterparts. Most of the others are the same lenses.

YOu haven't given an example of even one lens that's biiger on APS-c. Exept by using the following argument.

QuoteQuote:
My posit is that this is a market problem. There's a 15mm F/4 APS-C lens but there's no 23mm F/6 full-frame lens.
You can solve that problem by talking what there isn't, talk about and if its not there use the closest. I would also reject your assertion that the equivalent of 15mm f4 is 23 F/6. F stops measure light transmission, not DoF. F4 on an APS-c is F4 on a MF is F4 on a 4x5 view camera. That is not a useful construct. Especially since it is possible to produce parbolic glass elements that change DoF characteristics. So, in a global sense it's always safest to check DoF lens by lens, and not assume DoF os a function of f stop. I might be, it might not be. The DoF calculator works only for circular glass elements.

What i'm saying is you need to look at this in terms of what's available. Any lens made for an Pentax FF can be used on APS-c. But there are a pile of lenses available for APS-c that won't work on FF. You will always have more lens selection on APS-c than FF. So you also have more choice.

But lets run the gamut.

I sometimes carry the S
Sigma 8-16
21 ltd
18-135
Sigma 70
A-400

You can't match the FoV of that set up for a fraction of the weight. Because the A-400 has to be replaced by a 600mm lens and that will blow your weight over the top.
04-22-2013, 06:51 AM   #118
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QuoteOriginally posted by ElJamoquio Quote
The DA70 is reported as pretty-close-to-full-frame if not full-frame. If true, the 70mm on FF would be like a 'digital zoom' similar to a APS-C zoom from 46-70mm F/1.6-2.4. (FF 70-106mm F/2.4-3.6).

That sounds like an awesome lens to me.
Indeed. I also like that my other favorite lens, the DA35 Limited, has been reported as just slightly vignetting @35mm (and with no vignetting at close distances) - both of these should be fun to use on a full frame Pentax.
04-22-2013, 07:09 AM   #119
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QuoteOriginally posted by normhead Quote
I would also reject your assertion that the equivalent of 15mm f4 is 23 F/6. F stops measure light transmission, not DoF.
...That's your prerogative, of course, but it basically stops the conversation in it's tracks.

When I print a photo, I care about noise and DOF. The EXIF that the digital file has doesn't matter to me at all. If you're not thinking about photos in terms of FOV, DOF, and SNR, there's really not much for us to converse about.

Last edited by Parallax; 04-23-2013 at 10:59 AM.
04-23-2013, 07:19 AM   #120
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QuoteOriginally posted by jogiba Quote
Just because it will use Pentax lenses?
That's like someone saying they own a Rolls Royce because they put a Rolls Royce hood ornament on their Ford Pinto.

Last edited by Parallax; 04-23-2013 at 08:09 AM.
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