DPReview.com is closing April 10th - Find out more

150f2, 50-200mm, and EC14 resolution tests

Started Jul 18, 2009 | Discussions thread
ForumParentFirstPrevious
Flat view
Timskis6 Veteran Member • Posts: 9,567
150f2, 50-200mm, and EC14 resolution tests
1

Camera: E-3

Lenses: 150mm f2, 150mm f2 + EC14, 50-200mm (147mm), and 50-200mm + EC14 (147mm)

Test conditions: RAW, outdoor, MF using 10X LV, eyepiece shutter closed and no LV for images, shade, sturdy tripod, remote cable release (2s), mirror lockup (5s), ISO100 for all except ISO200 for 50-200mm/EC14, subject distance ~5-6ft (US$1 bill). Slowest shutter speed 1/40s, IS off.

Purpose:

Soft images at 212mm f/2.8 (150mm + EC14)*. It was previously unknown what level of resolution degradation the EC-14 has on the 150/2. Also curious how the 50-200mm compared to the 150mm f/2 at 150mm (147mm), since it is well known the 50-200mm is extremely sharp at around 150mm, wide open.

Results:
150mm f2: sharpest at f2.2-2.5.
150mm f2 + EC14: sharpest at f/3.5
50-200mm (147mm): sharpest at f/4.5
50-200mm + EC14 (147mm): sharpest at f/6.3

And for reference (internal control), I know the 50-200mm (200mm) is sharpest around f/5.0, which is more or less what I observed here (f/5-f/5.6ish).

All images are normalized to WB @5600K, 100% crops in LR2.3 and resized to 250% in PSP9, lowest compression.

Please note comparisons can only be done within this test, outside images are not comparable.

References:

-- hide signature --

Tim
'I haven't been everywhere, but it's on my list.'
E3/E410/7-14/12-60/150/50-200/25/25/EC-14
http://www.flickr.com/photos/timskis6/

ForumParentFirstPrevious
Flat view
Post (hide subjects) Posted by
ForumParentFirstPrevious
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow