Interesting (?) question: in case the 1.4x TC will allow DA lenses to cover
FA sensor format, one could think it's a great way to make all DA lenses
work with their intended FOV on a FA body. E.g. a 14mm used alone on a DA
body will become a 20mm by using it via the 1.4x TC on a FA body, thus
resulting in more or less the same FOV on different format cameras.
Great, but what's the point of spreading the same amount of light gathered
by the same front lens on a larger sensor having say the same pixel count
(e.g. 24 MP) while losing one stop for exposure?
Dario
-----Messaggio originale-----
From: Dario Bonazza
Sent: Monday, January 27, 2014 9:08 PM
To: Pentax-Discuss Mail List
Subject: Re: Pentax 1.4x converter
In other words, a 14mm x 1.4x becomes a true 19.6mm lens - hence
irrespectively of sensor size - and not an "equivalent to XY mm" on a given
format.
The question to be answered is whether such a combo of lens and TC will give
an image circle covering 24x36mm format or not.
Dario
-----Messaggio originale-----
From: Dario Bonazza
Sent: Monday, January 27, 2014 9:04 PM
To: Pentax-Discuss Mail List
Subject: Re: Pentax 1.4x converter
No, the 14mm x 1.4x will become a 19.6mm f/4 in itself, whichever camera (if
any) you put behind it.
In case the resulting image will be large enough to cover the 24x36mm format
(not yet confirmed), it will project a FOV corresponding to a 19.6mm f/4
lens.
Dario
-----Messaggio originale-----
From: Alastair Robertson
Sent: Monday, January 27, 2014 8:54 PM
To: Pentax-Discuss Mail List
Subject: Re: Pentax 1.4x converter
wouldn't the lack of a 1.54 crop factor that APC-S sensor cameras have
over 35mm frame more-or-less cancel out the 1.4x converter effect so
that a DA14mm + 1.4TC on a 35mm frame would end up being a 14/1.54 x
1.4 = 12.7mm FOV on full frame?
Alastair
On 28 January 2014 08:42, Darren Addy <[email protected]> wrote:
On Sun, Jan 26, 2014 at 10:07 AM, Mark Roberts
<[email protected]> wrote:
(which he says Pentax is calling a "Full Frame Converter")
WUTT
If this is true, is it possible that the converter will allow DA
lenses (that don't quite cover full frame) to cover them adequately
(albeit at 1.4x the focal length). This would be most beneficial to
the faster DA lenses that don't cover full frame:
DA 14mm f/2.8 (21mm equiv. FOV on APS-C) would become a 21mm f/4 on full
frame.
DA* 16-50mm f2.8 (with 24-75mm equiv. FOV) would become a 24-70mm f/4
on full frame
DA* 50-135mm f2.8 (with 75-197mm equiv FOV) would become a 70-190mm f4
on full frame
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