| Latest Review Posted | Preset Tele-Astranar, Spiratone, Photax, Prinz-gal 400mm F6.3
This lens is not particularly good, but it does the job. Mine is branded a Rexatar 400mm.
I haven't had any luck getting any good pictures at the lower apertures (too blurry due to low depth of field and general poor sharpness), but it seems to perform well enough stopped down.
Using this lens for nature photography is difficult because it is incredibly cumbersome. Manual focusing (while usually my preference) makes it difficult to nail focus on a bird before it flies off. If you aren't careful, you can unscrew the lens instead of focusing.
Here are some example un-edited photos. They clean up quite well with edits, since contrast and saturation can be added in software, but sharpness is difficult/impossible to recover. I use a crop sensor, so you may get better results at full frame/35mm.
https://www.pentaxforums.com/gallery/images/114592/large/1_IMGP7676.jpg https://www.pentaxforums.com/gallery/images/114592/large/1_IMGP7731.jpg https://www.pentaxforums.com/gallery/images/114592/large/1_IMGP7754.jpg |
