Tagged with 3.5mm - Personal View Talks

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.

Coiled audio cables

Vitaliy_Kiselev — Fri, 22 Feb 2013 13:58:21 +0000

3.5mm to 3.5mm

Price: from $1 shipped

http://www.ebay.com/sch/i.html?_odkw=sop%3D15%26+osacat%3D0%26+nkw%3Dcoiled%2B3.5mm%2B%2B2.5mm%26+sacat%3D0&_osacat=0&_trksid=m570.l1313&_nkw=coiled+3.5mm+2.5mm&_sacat=0

3.5mm to 2.5mm cables also exist

Can be useful for cheap wireless systems used with GH2.

http://www.ebay.com/sch/i.html?_odkw=sop%3D15%26+osacat%3D0%26+nkw%3Dcoiled%2B3.5mm%2B%2B2.5mm%26+sacat%3D0&_osacat=0&_trksid=m570.l1313&_nkw=coiled+3.5mm+2.5mm&_sacat=0

Good and Cheap solution for microphone preamp?

sfbay_jon — Fri, 05 Aug 2011 09:04:37 +0000

I'm helping on an indy shoot here in SF and the sound guy has all the gear including Sennheiser mics and wireless, and a pre-amp, mixer and multi-track recorder, so now I'm inspired to do my cheap version of an audio setup.

All of the mics that I'm interested in are self-powered 3.5mm (LAV: ATR3350 and SHOTGUN: Sanhe or AT), I am looking for some cheap way to combine two mono mics into one stereo input for my digital recorder (Tascam DR07mkii) that has a single TRS 3.5mm input. @Stonebat mentioned (in another thread) the ART USB Dual Pre, so I looked at that and the Beachtek.

Thanks to Vitaly:-) I also bought a pair of the Superlux headphones! In reading and reading the reviews, I learned about a cMoy: cool "DIY" headphone amps that are built into small tins, like Altoid mints come in. (http://tangentsoft.net/audio/cmoy-tutorial/). Lots of people, like me, know better than to pick up a soldering iron, so hobbyists sell these pocket amps on eBay as kits or assembled for about $35! Sometimes we do get good and cheap!

All of which leads to what I'd like to see--a cMoy version of a mic preamp. I've googled and seen other people asking the question, but haven't found a good answer. Who knows if this exists? Or, is even possible? OR, perhaps more important, would like to have one, if it existed?