Just thought I would try this out Comparision 1 http://www.photo.net/photodb/photo?photo_id=1624784 Tamron 400mm f4 LD SP @ f4 Tamron 400mm f4 LD SP @ f5.6 Sigma 50-500mm @ f6.3 @500mm Sigma 50-500mm @ f8 @500mm Tamron 400mm f4 LD SP with pentax smc 1.7x AF TC @ f5.6 Tamron 400mm f4 LD SP@ f5.6 with vivitar macro focusing TC
Comparison 2 ( section of the image) http://www.photo.net/photodb/photo?photo_id=1624798 Tamron 400mm f4 LD SP @ f5.6 original size image sample Tamron 400mm f4 LD SP@ f5.6 with resizing, sharpening with FM S1 v2 photoshop action and noise reduction using FM isoX-v2 photoshop action Tamron 400mm f4 LD SP@ f5.6 with resizing, sharpening with FM S1 v2 photoshop action Tamron 400mm f4 LD SP@ f5.6 with resizing with FM S1 v2 photoshop action Tamron 400mm f4 LD SP@ f5.6 with vivitar macro focusing TC Tamron 400mm f4 LD SP with pentax smc 1.7x AF TC @ f5.6 Sigma 50-500mm @ f8 @500mm original picture (Tamron 400mm f4 LD SP @ f5.6 ) In conclusion the Tamron F4 LD SP is an awesome lens and coupled with the 1.7x TC is as good or better than the Sigma 50-500mm in terms of resolution. Probably should have tried them both at 400mm but to late for that now. However the real star is the Fred Miranda S1 v2 interpolater which increases the image size with only some degradation of image resultion, it cant be the 400mm and 1.7x but beats the Vivitar TC 2x. The Vivitar macro TC was very disapointing image was soft even at 5x7. Wayne
