You are close. What get's cancelled out is that the effective FOV becomes close to the actual FOV of the converted lens. But the focal length and speed changes (1.4x and 1 stop of light).
On Mon, Jan 27, 2014 at 1:54 PM, Alastair Robertson <[email protected]> wrote: > 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 >> >> -- >> PDML Pentax-Discuss Mail List >> [email protected] >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- Photographers must learn not to be ashamed to have their photographs look like photographs. ~ Alfred Stieglitz -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
