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Messages - canonuser78

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1
Technical Support / choosing the right ND filter value
« on: May 08, 2013, 03:57:14 PM »
Hello there,
I am about to search and buy one or two screw on ND filters and I plan to use it specially in video mode. I have some difficulties in choosing the right ND filter values in order to be able to shoot in daylight with wide open aperture (f2.8-4), ISO 100-160, shutter speed 1/50 at 24fps.

According to this chart considering 1/4000 shutter speed in daylingt at ISO 100-160, f2.8-4, 24fps, I wonder which one between these filters ND 1.8(1/60) and ND 2.1(1/30) will fit my needs better (?)
I just need a confirmation .
thanks,

2
Lenses / Re: Cheap fisheye for canon full frame?
« on: May 08, 2013, 04:10:58 AM »
http://www.the-digital-picture.com/Reviews/Samyang-14mm-f-2.8-IF-ED-UMC-Lens-Review.aspx

the samyang 14mm is supposed to be pretty good


indeed, Samyang/Walimex/Rokinon (the same thing) 14 mm VDSLR or DSLR version ...,good value for money .Take note the mustache distortion is pretty nasty, specially on a Full Frame camera but in most of the cases you can fix this in post processing, there are some software solutions .discussions on the subject here if this help :
http://www.canonrumors.com/forum/index.php?topic=11407.0
cheers

3
I appreciate it,
I already tried a cokin filter system but to be honest , for me at least ,it's a pain in the a** to carry/use it, that's why my attention is back to basics (screw on filters).Don't want to hear about additional frames attached to the lens or and any other unhandy accesories if it is possible of course :D

Technically I try to find the best solution for the 16-35 II 82mm thread in order to shot videos on a FF at 24fps, wide open aperture (f1.4-2.8 max 4), 1/50 , ISO 100/160 in daylight without having overexposure, uneven polarization or vignette.

Quote
Btw: you can also build a vari-nd filter from two polarizers (cpl + non-cpl) which is exactly is what a composite nd filter really is, just in the home-made version you can still use the polarizers alone and you have the option to adjust the rear cpl for a polarizer effect which is not possible with a ready-made vari nd. I wouldn't use any vari-nd for uwa though.

I think I'll try this at the end , already have the slim CPL.
thanks,

 

4
i got the lightcraft workshop variable ND 82mm it flares out to 86mm and comes with an 86mm centerpinch lens cap and doesnt vigentte on full frame


Hello there,
no vignette on full frame for this kind of filter , sounds great , but how about the uneven polarization at 82mm (16-36 USM II) ? I asked because I have found something cheaper with similar sizes as lightcraft 82/86 front thread diameter :

FOTGA Slim Fader Variable ND Filter Adjustable ND2 to ND400 82mm , review here.

My concerns are related to this line :
The Fader ND filter is suggested to use with wide and standard lens to obtain the best performance. Image quality may drop when focal length above 200mm. It may not be suitable for wide angle lens <24mm,35mm film format equivalent .

Anyone tried ?
thanks,

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