Tagged with cctv - Personal View Talks

C Mount Lenses for m43

Aria — Tue, 03 Jan 2012 19:10:49 +0000

Hi guys,

I wanted to know if anyone has experience with C Mount Lenses. I was looking at some different lenses and really don't understand the difference between the CCTV, 16mm, 2/3" C Mount Lenses and if they can work with the GH1.
I also noticed that they make mention of some Lenses being 1" or 1/2". What does this mean for use with a GH1?

Could a Lens like this be used? http://www.bhphotovideo.com/c/product/341297-REG/Pentax_C60812_C60812_8mm_to_48mm.html

Which CCTV lens for wide angle fisheye use ?

TruHype — Fri, 26 Jul 2013 05:31:26 +0000

Hello everyone,

I've recently started to get interested in C mount (CCTV) lens, for they are fast, wide, and cheap. So I wondered, is there any CCTV lens that I could use as a Fisheye (and get the same effect as the Panasonic 8mm f3.5, but faster) ? Here's a few lens I've found looking on the internet :

Rainbow 3.5mm 1.6
Tamron 4-12mm 1.2
Pentax 6mm 1.2 (+ wide conversion lens x0.45)

Wanted effect :

The GH2 exact m4/3 sensor crop is x1.86.

So I would like to get the same widness as the Panasonic 8mm or any 8mm Fisheye (Samyang, Peleng, Rokinon...) :

Panasonic 8mm : 8 x 1.86 = 14.88mm equivalent (no need for ETC mode)

Rainbow 3.5mm : 3.5 x 1.86 = 6.51 -> 6.51 x 2 = 13mm equivalent

Pentax 6mm : 6 x 1.86 = 11.16 -> 11.6 x 2 = 23.2mm equivalent -> 23.2 x 0.45 = 10.44mm equivalent

x 1.86 : GH2 Sensor Crop

x 2 : ETC tele conversion mode crop (to cover vignetting)

x 0.45 : Wide convversion lens

Does that mean we could use any CCTV c mount lens instead of the Panasonic lens to get the wide fisheye effect ?

A few videos :

Lenses :

C mount lens (1/2") work well on the GH2, but I heard that the CS mount lens (1/3") would still have really heavy vignetting because even with the ETC mode it would not cover entirely the GH2 sensor. Is that true ?

Interesting CS mount lens, but 1/3 inch : http://www.ebay.fr/itm/TAMRON-Manual-Iris-CCTV-Lens-3-0-8mm-1-1-0-ASPHERICAL-C-Mount-3-Mega-Pixel-/261248954560?pt=UK_CCTV&hash=item3cd3a6b0c0

I would use the fisheye to film Skateboarding.

Thank you.

Kowa USA - Torrance , CA ..... Road trip anyone?

CRFilms — Wed, 12 Oct 2011 04:19:04 +0000

There's a lot of talk of how SLR Magic is a rebranded Kowa CCTV lens. These are links to Kowa USA dealers and Headquarters:
http://www.kowa-usa.com/frontend/contact.asp
http://www.kowa-usa.com/frontend/store.asp (select opto-electronic)
http://www.kowa-usa.com/frontend/proddisp.asp?co=10000380 -these models, 1" sensor lenses

The dealer in Kyle, TX is closest to me....it's 3:00am as I type this....assuming he has some in stock, and he lets me come down and video it, the soonest I could have a video up is around 30hrs...IF I had a c mount adapter. So, realistic best case is 3-4 days... after ordering a c-mount adapter off Amazon.

Could somebody beat me too the punch? :)

CCTV/C-Mount lenses for G series (smaller sensor)

AlbertZ — Mon, 16 Apr 2012 07:39:30 +0000

I have seen lots of topics dealing with cheapy (and fast) cctv lens, c-mount lenses on Panasonic GH1/2. Vignetting is a serious issue on these lenses, in particular for wide angles; many videomakers on GHx use ETC; However, most of the problems of vignetting seems to be caused by the non-standard size (16/9 crop etc) of GHx-sensor, which is a little wider than standar M4/3; GF2/3 cameras, on the contrary, have standard M4/3 sensor, so these cameras shoud have less vignetting issue... What's your experience with GF1/2 and C-mount?

for example, here you can read an article about wide and fast c-mount lenses..they work better on GF series!

FS: Pentax Cosmicar 12.5mm f1.4 C-mount with M4/3 adapter

punkman — Wed, 15 Feb 2012 11:23:55 +0000

I have a couple Pentax Cosmicar 12.5mm f1.4 C-mount lenses. They have been modified to fit on a C-mount to M4/3 adapter (the barrel needs some filing to fit the adapter, done on a lathe). They have been shimmed for proper infinity focus and adjusted so the aperture/focus markings are upright.

There is vignetting. I will upload some test shots soon.

You get:

Pentax Cosmicar 12.5mm f1.4
C mount to M4/3 adapter (black anodized aluminum)
Front and rear caps

Optional features:

M4/3 AF-confirm chip, mounted on adapter
Click-less aperture
C-mount to Nikon J1/V1 adapter (instead of M4/3)

Asking price: $150

I will ship worldwide, contact me for a shipping cost quote. Let me know if you have any questions.