It’s always interesting to see how C-mount lenses do work on the Panasonic GH2 with 1:1 crop mode. Seb Farges tested three lenses:
“This is a movie shot with three lenses, from 6mm to 3.5mm, which is 15mm to 9mm for micro 4/3 sensor (24X36 : 31mm to 18mm). 1st part with the 6mm (more info: vimeo.com/โ20766631), some shot with polaroid variable ND filter. Second part, same lens but with a Pixco 0.45X lens converter, found for 16โฌ on ebay, it’s 40.5mm screw mount filter size lens is perfect for the Pentax. The third part is shot with a new lens I’ve found on Ebay for 46โฌ, a C-mount Rainbow 3.5mm 1.6, perfect for the crop function ! It’s very wide, little fish eye effect, but I have a little focus problem with my copy, so I have to closed the aperture, but not too much because it seems I have problem of intern dirts, that can be viewed in more closed apertures.
I like this [shoplink 21738 ebay]3.5mm Rainbow C-mount[/shoplink] lens, it’s fun and very wide. I hope you’ll enjoy the shots.”
Links
C-mount Pentax 6mm 1.2 on [shoplink 21691 ebay]eBay (Click here)[/shoplink].
C-mount Rainbow 3.5mm 1.6 on [shoplink 21737 ebay]eBay (Click here)[/shoplink].
Pixco wide angle lens converter 0.45X on [shoplink 21738 ebay]eBay (Click here)[/shoplink].
33 Responses
excellent clip! i wonder if i use those lenses on olympus how much i would need to crop the heavy vignetting area away, and what would be left. the fast f values keep the dof to a reasonable level, i like that. and those ebay prices…i should check them immediately to see if i can get one too for such low bid ๐
Thanks Ulli. If you use the digital 2X function instead of the ETC 1:1, it will vignetting a little, but bad fully the digital zoom is not very good in video.
like it a lot. great story. very versatile lenses and cool music.
Thanks Andrew ๐
i watch this movie again and again and wonder how ep2 or epl2 would compare?
i notice lack of detail when panning, but shadow and noise seem controlled in low light.
if you could do a similar test with the same subjects idea and lenses, I think a very interesting comparison.
I do understand video capabilities are different between gh2- ep2/epl2.
what do you think seb?
๐
Thanks Andrew. Yes GH2 is much better than ep2… I was thinking about shotting a repetitive scene with all my lenses. stay tune ๐
so if I used it on a PEN w/out cropping, there’d be heaving vignetting yea? otherwise I’d buy them in a heartbeat @@
Yes, you’ll have heavy vignetting on the Rainbow 3.5mm like the Pentax 6mm, you can see the vignetting of the 6mm at the beguinning of this test :
http://vimeo.com/20766631
also would be good of you could post exif and data about lenses dof fps etc….
Thanks Seb Farges, excellent video, very interesting test. If I’m not mistaken 1:1 crop means something like 6.7x zoom, the camera takes data only from central 1920×1080 pixels of the sensor. What are the focal lengths of those lenses then?
Thanks Miroslav. 1:1 crops means X2.6, then for 24X36 eq. 2X. So 6mm to 3.5mm give 15mm to 9mm for micro 4/3 sensor and 31mm to 18mm for 24X36 eq.
Thanks for the explanation, keep up the good work!
here are the links where I found all these :
C-mount Pentax 6mm 1.2 modified http://tinyurl.com/3muqwbe
C-mount Rainbow 3.5mm 1.6 http://tinyurl.com/65v4tjc
Picko wide angle lens converter 0.45X http://tinyurl.com/3fdvw48
mode 24P
No CC
cinema mode
A little long but nicely done, thanks for sharing!
Thanks Bu, yes you’ll have to watch to see the 3.5mm shots ๐
Video is shaking a lot. Difficult to watch.
“Video is shaking a lot. Difficult to watch.”, it’s a little hard comment ๐ I hope you did not watch my movies with 25mm and 35mm lenses ! Well it’s not so easy to film my crazy daughter on a scooter from one hand the GH2, the other hand my bicycle ! ๐
Have you seen these Seb? http://camcaddie.com/ There was a GH2 video on here or mirrorlessrumors.com of skaters done using one, looks stellar for this type of work.
nice shots, very well edited, like it a lot ๐ where was this filmed?
btw andrew the music is Justice – genesis
Thanks Joe ๐ Most of the shots were taken in Bordeaux (french west coast) and in Maubuisson (near the atlantic ocean coast).
such a lovely city !!!
I can’t believe I just watched 3 minutes of someone’s family footage. That’s pretty damn cool home video. Very nice music, and cute kid ๐
Thanks Ahem ๐ Family movies is my speciality, I like filming the people I love , and try to interest the audience, and my daughter is such a phenomenon ! ๐
You have a lovely family. Without meaning to sound too creepy….more of your wife, please ๐
Impressive video….Great work!
Thanks Luke, I will tell her ! ๐
That was an excellent video. I wish my home movies looked so professional!
(and +1 on Luke’s comment)
Nope, sounds creepy no matter how politely you say it.
Thanks for the video. Am I missing something? The field of view on the shots looked very normal–as in it felt like a 28-50mm lense. I didn’t get the same wide feel I would get with the nikon 14-24mm on my full frame Nikon.
What is the crop factor with c-mount lense on a 43 sensor?
I so much want to like the GH2 since Nikon video just isn’t there yet, but the lack of true wide angle lenses for 43 sensors make me hesitant.
Thanks pmt. The field of view of the shot are, in 24X36 eq. 31mm for the Pentax, maybe aroud 25mm for the Pentax + Wide converter, and 18mm for the Rainbow. To obtain this, for example for the Rainbow 3.5mm you have to calculate : 3.5mm X 2.6 (for the GH2 crop 1:1 function) X 2 micro 4/3 crop factor (for the 24X36 eq.). So for 40โฌ you can have a fast 18mm F1.6. If you want an equivalence of your 14mm, you’ll have to take the Panasonic 7-14, that will give to you a 14-28mm eq, for 800โฌ and and F4 aperture.
Thanks for the info sebfarges.
Hello! Very cool video! and awesome music!
Stupid-amateur question, with the rainbow lens, which adaptor you use?
Thanks!
Thanks Riki ๐ The Pentax and the Rainbow are C-mount lenses, so you’ll need a C-mount to micro 4/3 adapter to use them on the GH2. You can find on Ebay for 20$
If you have very deep pockets, this one probably cover almost the whole sensor:
http://cgi.ebay.com/Century-Extreme-Wide-angle-3-5mm-T1-8-C-mount-nice-/270760944439?pt=Camera_Lenses&hash=item3f0a9c2337#ht_500wt_1156