Posts for: Pablo8
Jun 15, 2012 04:18:07 #
Phocus wrote:
Anyone ever cut a circle in cardboard to make an apeture? Had a friend that did this and there was a formula to do it but we never got to discuss it further before he passed away. So now I'm still curious.
Here attached will be my 500mm f4. Sigma lens, with front cap which has a swivel centre section. When in the open position, the lens acts as an f5.6 aperture. The lens diameter is approx' 6ins, the hole diameter is approx' 4ins. Hope this helps with your lens.
Jun 14, 2012 07:52:53 #
I've got a Nikon 500mm f.8, and a Sigma 500mm f.4 (Big Bertha) . Rip... Is that a Novoflex 640mm F8 lens you are holding? I have that one plus 400mm and 280mm with the pistol focus grips.
Jun 6, 2012 03:19:06 #
Festina Lente wrote:
quote=rpavich quote=wlgoode quote=Lorendn I alm... (show quote)
The disadvantage with the Cokin ND, is that they are not (or weren't ) neutral grey, but gave a colour cast. Stopped using them in preference for Lee Filters.
Jun 4, 2012 02:55:30 #
gazzman wrote:
I've just got myself an infra-red filter, but am confused how to use it.
I screwed it onto the lens, but cannot see a thing through the veiw-finder! It is totally blacked out.
Any ideas of what I'm doing wrong will help.
Thank you :)
I screwed it onto the lens, but cannot see a thing through the veiw-finder! It is totally blacked out.
Any ideas of what I'm doing wrong will help.
Thank you :)
Just holding and looking through the filter before screwing onto the lens, would have indicated the opaqueness of it. Why did you buy it without this knowledge?
Jun 2, 2012 05:40:12 #
# 34 Doesn't sound as though you have ever worked as a professional Wedding or Press Photographer.
May 30, 2012 08:19:26 #
I was advised by a Nikon Technical Seminar lecturer to leave zero sharpening in the camera settings, and sharpen in post processing. Works for me... (Retired Pro).
May 24, 2012 03:09:52 #
Cokin Grad Grey filters had the reputation of giving a colour cast, for the more discerning slide-film worker when they were first introduced in the UK. I soon turned to Lee filters for a true neutral grey.
May 23, 2012 03:12:08 #
Bill41 wrote:
My relatives ask me to shoot their weddings freque... (show quote)
I'm surprised you still get invitation to relatives weddings.
May 21, 2012 03:05:51 #
I used Cokin filters in the days before Digital came on the scene. My experience with their Grad Grey and ND filters, was that they were not neutral in colour. This was most noticable with Tranny film shots. Lee filters cost more but they are better quality regards being neutral in colour. Cokin will be OK for B&W though.
May 20, 2012 03:09:40 #
Audwulf wrote:
Hey Alex,
Here are samples of IR. I used a Cokin 007 filter.
Here are samples of IR. I used a Cokin 007 filter.
It's possible, the filter you have, was designed for use with Infra-Red film, or you did not complete a 'White Balance' with the filter in place. You have not achieved typical infra-red results from looking at your samples.
May 14, 2012 09:33:02 #
mrblackett wrote:
Yep, seems like a filter issue, weird that it's not happening on all 4 corners.
Perhaps it is more noticable in the sky area, as opposed to the darker vegetation in the lower corners. Then again, it could be that the lens was made on a Friday afternoon, and is not centrally registered over the sensor.
May 13, 2012 10:31:19 #
I have got 280mm 400mm and 640mm lenses with pistol grip focus. Manual stop down and Nikon fitting plus Pentax screw lens fitting. Not used them for a while as I bought them for my Nikon film bodies. Good quality optics and the pistol focus grip useful for following action.
May 13, 2012 03:27:55 #
Just looked at my Sigma 10 ~ 20mm lens, and yes, the markings are distances in feet. The line will be the distance at which the lens is focussed, if using manual focus. But the DOF with this lens is so deep, one should not have to worry too much about being out of focus.
May 11, 2012 11:05:27 #
Pity, as you would have a long journey to come to my lectures.
May 11, 2012 10:45:38 #
snowbear wrote:
That's just pincushion distortion due to the wide angle being used.
Nickey wrote:
I wondered if the subject is leaning forward? The building in the background doesn't look straight, looks crooked to me.
That's just pincushion distortion due to the wide angle being used.
To me, that is perspective distortion (Keystoning) Pin - Cushion distortion would give inward curved lines to the straight pillars and vertical building lines at the picture edges.