photonius

photonius

Lives in United States United States
Joined on Jan 5, 2008

Comments

Total: 67, showing: 1 – 20
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In reply to:

photonius: i just found the Kodak Wratten Carbon Neutral Density gel filters. Looking at their transmission curves that you find at Kodak, they seem indeed very color neutral, they also cut the IR, so indeed the magenta cast may be of the past.

Yes, as I mentioned in another reply earlier, most filters, also B+W, singh ray, and others don't filter in the IR, thus leading to color casts with high ND filters. Thus it is nice to see that this issues is finally being noticed. In film days not an issue but it seems it took manufacturers a while to address it with the filters.

Direct link | Posted on Feb 28, 2015 at 19:32 UTC

i just found the Kodak Wratten Carbon Neutral Density gel filters. Looking at their transmission curves that you find at Kodak, they seem indeed very color neutral, they also cut the IR, so indeed the magenta cast may be of the past.

Direct link | Posted on Feb 28, 2015 at 10:36 UTC as 3rd comment | 3 replies
In reply to:

jtan163: What would an IR cut filter be used for?
I was under the impresion most digital sensors had one on board (with some exceptions, Leica M8?).
Would these be used to allow the specialist astro cameras (e.g. D810a and the Canon whtaever it is a) to be used in more normal photography?

most of the strong ND filters give a color cast, because - despite the IR filter in the camera - IR will leak through and cause these color casts. The ND filters have normally no filtering capacity in the IR range, although they reduce the transmission in the visible light. Because the visible light is reduced, the IR that gets through has a stronger effect than normally. The simple way to prevent this is to extend the wavelengths that are filtered into the IR.

Direct link | Posted on Feb 27, 2015 at 11:05 UTC
On Opinion: Canon EOS 750D and 760D article (316 comments in total)
In reply to:

Mike Jacoubowsky: My prediction- The T6s lives a long and happy life and becomes a "Canon to remember." The T6i goes away fairly quickly, replaced by an "SL" version (smaller & lighter, same IQ but enough fewer features to strongly differentiate from the T6s). Give the T6i a year or so.

The one HUGE feature the T6s holds for me? The level. There are some of us (raising both hands on this one!) that have trouble getting shots level, and frequently need to adjust rotation by up to 1.75 degrees or so. Having that level will both decrease time in Photoshop and likely get faster & better shots.

I agree about the level. It should really be in all cameras, as it would also be a good feature for beginners, many P&S cameras have that. I don't have any particular problem holding the camera steady, but looking through the small Rebel viewfinder while taking a UWA shot, it's not so trivial to get it exactly straight. I have to test my camera seriously once, I suspect the viewfinder is not quite straight either.

Direct link | Posted on Feb 17, 2015 at 20:33 UTC
On Canon EOS 5DS / SR First Impressions Review preview (2286 comments in total)

The Nifty Fifty is already the 50mm f1.8 lens.

It should be the Hefty Fifty or something like that.

Direct link | Posted on Feb 10, 2015 at 14:20 UTC as 115th comment | 3 replies
On Hungarian law bans photos taken without consent article (321 comments in total)

It may be a way to suppress opposition and protests. The Hungarian government at present is very right wing and has run already into problems with the EU (of which it is a member) about continuously eroding civil liberties and suppressing opposition. The law may well be mostly applied during demonstrations so authorities can confiscate cameras, mobiles etc. that document abuse.

Direct link | Posted on Mar 18, 2014 at 18:58 UTC as 124th comment | 2 replies

well, the sensor is only 16 bit. "This new sensor is a 19-Mpix, 30.7 x 15.8mm Bayer pattern 16-bit CMOS sensor ... ", so obviously some processing.

Direct link | Posted on Mar 3, 2014 at 22:26 UTC as 22nd comment | 2 replies

" Sales for the Rebel SL1 have not been as great as we expected in America". I guess everything has to be supersize there.... ;-) But surely, with the obesity pandemic, small controls won't work.

Direct link | Posted on Mar 3, 2014 at 20:53 UTC as 81st comment | 2 replies

I thought they use a trick to have multiple exposures at different sensitivities?

Direct link | Posted on Mar 3, 2014 at 20:16 UTC as 26th comment | 4 replies
On Nikon Coolpix P600, P530, S9700 go big on zoom range article (45 comments in total)

no GPS in the bigger models? why

Direct link | Posted on Feb 7, 2014 at 11:59 UTC as 15th comment | 1 reply
In reply to:

Abaregi: Why the small sensors in these new ones from Fuji, isn't the point of stepping up from a cellphone or compact camera to get higher image quality indoors and in darker days/nights?

Simplified: Big sensor = big lens
So, either dSLRs for big sensors, or a compromise like Sony RX100. A compact all in one with large zoom range, that's what these cameras are. If you want big sensor go for the X FUJIFILM System X-E2 etc.

Direct link | Posted on Jan 6, 2014 at 17:10 UTC
In reply to:

ConanFuji: Fujifilm...wake up.
You've been stuck on 16MP since the F500EXR like 5 years ago.
There's smartphones with more megapixel than these!
And what's with the slooooooooooooooooooowwwww lens on pinhead sized sensors?
It's the era of the Full Frame, baby!

I guess that was ironic. You know of course how big a 1200mm lens is on FF : http://www.bhphotovideo.com/c/find/newsLetter/Mother-of-All-L-Lenses.jsp
And that at f5.6 diffraction on that size sensors limits resolution to about 3MPs...

Direct link | Posted on Jan 6, 2014 at 17:03 UTC
On Tamron to develop 150-600mm F5-6.3 ultra-telephoto zoom article (193 comments in total)

Hopefully this will bring some movement into the long tele zoom market, if it achieves similar quality as the Tamron 70-300 VC. In Canon land, nothing really beats the aging 100-400 L so far, the cheaper Sigmas being worse and heavier.

Direct link | Posted on Nov 7, 2013 at 10:38 UTC as 57th comment
On Nikon Df preview (2792 comments in total)

Does the ISO wheel spin when the camera is set to AUTO ISO? ;-)

Direct link | Posted on Nov 5, 2013 at 16:42 UTC as 604th comment | 1 reply
On Niki Feijen's haunting images of abandoned houses article (218 comments in total)

picture 9, the church. Is that staged? must be, can't believe there would be dead bodies sitting there. so, in all pictures, how much is staged, versus real?

Direct link | Posted on Oct 26, 2013 at 13:09 UTC as 98th comment

too bad they didn't put the GPS in there that can be found in their smaller cameras. For traveling, it's nice to sometimes tag photos in remote areas.

Direct link | Posted on Oct 16, 2013 at 10:18 UTC as 33rd comment
In reply to:

abortabort: Seriously? The 16-28mm is a great lens, but 5 TIMES the price?! Samyang's cine versions are something like $50 more, if that. I suppose this will still be cheaper than the competition though.

I don't think they will make substantial better quality control on this lens - certainly not the way Roger suggests that cinema lenses need to be highly calibrated in his blog. The optical specs are the same as the normal lens, it's really just the barrel which is different. I think they look at it as a niche product, selling few copies to pros that can afford it.

Direct link | Posted on Sep 23, 2013 at 11:51 UTC
In reply to:

CarVac: They may have reworked some of the mechanisms to provide for parfocal zooming. That would certainly account for an increased price.

based on the optical diagram, they are the same.

Direct link | Posted on Sep 23, 2013 at 11:47 UTC
In reply to:

Jorginho: I just decided on the 84.5 filter series. Quite a few Dutch reviews by pro photographers convinced me. In general: in spite of the hard (organic) glass not scratch free, but no colour cast not even when you put two or three in your filterholder. Price is okey. So...no Cokin (creative) for me.

But a good thing they survive.

ah, nice, but not available everywhere yet. Still, they fit the Cokin P and same material as Cokin, Hitech, Lee, Singh-Ray (C39). perhaps dyes are better (no IR leak??)

Direct link | Posted on Sep 6, 2013 at 21:10 UTC

Decent price with decent quality will sell. Look at how Lee is continuously sold out, despite the high price. They just need to update for modern needs, i.e. NDs, and gradients (no color necessary usually) for photography, and sets of filters for video (effects that are not easy to do in post).

Direct link | Posted on Sep 6, 2013 at 16:31 UTC as 34th comment
Total: 67, showing: 1 – 20
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