The GetDPI Photography Forum

Great to see you here. Join our insightful photographic forum today and start tapping into a huge wealth of photographic knowledge. Completing our simple registration process will allow you to gain access to exclusive content, add your own topics and posts, share your work and connect with other members through your own private inbox! And don’t forget to say hi!

Problems with Wide Lenses - Summary

henningw

Member
There are lenses for 1.2-1.3" CCD sensors, but they cost between $2000 and $5000, the ones I've seen. That one above is probably well over $2000.
And it's HUGE and heavy. MTF looks good, but over 20% distortion! No thanks.

Henning
 
S

seb33

Guest
WIDE SHARP CHEAP and FAST C-mount lens on GH2 !!! (Pentax 6mm 1:1.2 with crop mode 1:1)
http://vimeo.com/20766631
NEW : QUICK TEST between this lens and the Lumix pancake 14mm 1:2.5 here :
vimeo.com/​20788176
AT LEAST I've found the PERFECT WIDE SHARP and CHEAP lens for the GH2 !!! It's a C-mount Pentax/Cosmicar 6mm 1:1.2 lens I've bought 9.99€ (12.50$) on Ebay !
The rear barrel had to be modified for 20€ (watch pictures below) to fit on the C-mount to micro 4/3 adapter (Kipon).
This 6mm focal lenght on the GH2 gives a huge vignetting on micro 4/3 sensor, but thanks to the new crop 1:1 GH2 function, the vignetting is disappearing completely !
This 6mm lens with the crop function gives nearly the same frame (same width but less height) than on the Lumix 14mm 1:2.5, but much much more faster.
It's a sharp lens, even with the crop. In 24X36 eq. it's a 30mm.
This lens is incredible for GH2, there is no other competition for such a fast lens !

In this movie you will watch daylight tests (always @ 1:1.2, 1/50 shutter speed, 160 asa) with a 22€ Polaroid 43mm variable ND filter and a 40.5 to 43mm step-up ring, there's my girlfriend preparing her new collection for children "Pitchoovintage".
Then you will watch night test, from 160 to 3200 asa, always @ 1:1.2 and 1/50 shutter speed.

GH2 24P
Crop mode 1:1
No CC
from 160 to 3200 asa
from 1/25 to 1/50 shutter speed
C-mount Pentax/Cosmicar 6mm 1:1.2
edited on Adobe Premiere CS5

music : Elusive "Intro" + "writing on the wall" from "Pressure Drop" EP
duration : 4mn49sec

HERE IS AN INTERESTING LINK FOR HOMEMADE C-MOUNT MACHINING :
cjeastwd.blogspot.com/​2009/​06/​adapting-lens-to-fit-mount.html
And a post (in french) from my friend Christophe about the crop :
christophemilet.com/​?p=1589
 
Top