Front-Focus Tamron 28-75

[bboyoutburst]

Hice estas pruebas caseras, sobre trípode a unos 45º, el periódico del otro día. Dos intentos por separado con resultados similares si no me equivoco. Me gustaría saber si este tipo de fallo del AF se puede corregir con una 5D Mark II (que estoy barajando como próxima adquisición). También si me recomendáis por otro lado enviarla de vuelta a Tamron, ya que está en Garantía (vivo en bélgica pero la compré por ebay en alemania, dónde está registrada la garantía...) Que diagnóstico y tratamiento recomiendan doctores? Un saludo!

28mm f2,8 AF en "mundo"
http://farm5.static.flickr.com/4025/5128819380_e4165fa2d7_o.jpg (http://www.flickr.com/photos/bboyoutburst/5128819380/)
Mundo28mm2.8 (http://www.flickr.com/photos/bboyoutburst/5128819380/) by bboyoutburst (http://www.flickr.com/people/bboyoutburst/), on Flickr

35mm f2,8 AF en "mundo"
http://farm2.static.flickr.com/1423/5128213857_b263282e4c_o.jpg (http://www.flickr.com/photos/bboyoutburst/5128213857/)
Mundo35mm2.8 (http://www.flickr.com/photos/bboyoutburst/5128213857/) by bboyoutburst (http://www.flickr.com/people/bboyoutburst/), on Flickr

50mm f2,8 AF en "mundo"
http://farm2.static.flickr.com/1387/5128818010_7da4d6d9c4_o.jpg (http://www.flickr.com/photos/bboyoutburst/5128818010/)
Mundo50mm2.8 (http://www.flickr.com/photos/bboyoutburst/5128818010/) by bboyoutburst (http://www.flickr.com/people/bboyoutburst/), on Flickr

60mm f2,8 AF en "mundo"
http://farm5.static.flickr.com/4006/5128816834_38c74af658_o.jpg (http://www.flickr.com/photos/bboyoutburst/5128816834/)
Mundo60mm2.8 (http://www.flickr.com/photos/bboyoutburst/5128816834/) by bboyoutburst (http://www.flickr.com/people/bboyoutburst/), on Flickr

75mm f2,8 AF en "mundo"
http://farm2.static.flickr.com/1336/5128210947_07847708cb_o.jpg (http://www.flickr.com/photos/bboyoutburst/5128210947/)
Mundo75mm2.8 (http://www.flickr.com/photos/bboyoutburst/5128210947/) by bboyoutburst (http://www.flickr.com/people/bboyoutburst/), on Flickr

[bboyoutburst]

Aquí la primera prueba, esta vez AF sobre "Bruselas"

33mm f2,8
http://farm2.static.flickr.com/1362/5128813956_5245cb9572_o.jpg (http://www.flickr.com/photos/bboyoutburst/5128813956/)
Bruselas33mm2.8 (http://www.flickr.com/photos/bboyoutburst/5128813956/) by bboyoutburst (http://www.flickr.com/people/bboyoutburst/), on Flickr

50mm f2,8
http://farm2.static.flickr.com/1141/5128813540_09036e71c0_o.jpg (http://www.flickr.com/photos/bboyoutburst/5128813540/)
Bruselas50mm2.8 (http://www.flickr.com/photos/bboyoutburst/5128813540/) by bboyoutburst (http://www.flickr.com/people/bboyoutburst/), on Flickr

60mm f2,8
http://farm2.static.flickr.com/1113/5128812538_d78808c4f1_o.jpg (http://www.flickr.com/photos/bboyoutburst/5128812538/)
Bruselas60mm2.8 (http://www.flickr.com/photos/bboyoutburst/5128812538/) by bboyoutburst (http://www.flickr.com/people/bboyoutburst/), on Flickr

75mm f2,8
http://farm2.static.flickr.com/1309/5128207165_d30f6c01fb_o.jpg (http://www.flickr.com/photos/bboyoutburst/5128207165/)
Bruselas75mm2.8 (http://www.flickr.com/photos/bboyoutburst/5128207165/) by bboyoutburst (http://www.flickr.com/people/bboyoutburst/), on Flickr

[bboyoutburst]

Nadie que me pueda interpretar esto o darme un consejo?