Messages

1

Third Party Manufacturers / Re: Sony 400/4 telephoto on the way....

« on: May 03, 2013, 10:47:20 AM »

See, for example, Very Long Baseline Telescopes.

sorry but aren´t that radio telescopes??

2

Third Party Manufacturers / Re: Sony 400/4 telephoto on the way....

« on: May 03, 2013, 10:42:59 AM »

Absolutely no sign of a new 400/4 coming from Canon ie a scaled up version of the superlative 300/2.8 II would be just fine - very little R&D required!.

how much exactly.. in manhours?

3

Technical Support / Re: 10 Stop ND Filter - Metering

« on: May 03, 2013, 10:26:20 AM »

I have B+W/Schneider 10-stop NDs, they're good but not true neutral, they have a warm tone.

mine is a cheaper Haida 10 Stop Pro II MC (Schott glass).
he has a light blue tone. at least the non pro version has, as reported.
i have not noticed that yet with my few testshots out in the garden.

after some reading i decided to safe myself 70 bucks and go for the haida.
no matter if warm or blue tone you have to adjust in post anyway.
and those who have both filters wrote they don´t see any other difference between a B+W and the haida.

small test (not mine):

http://www.flickr.com/photos/66830363@N02/8401550855/#


i will have to do more testshots today but im pretty satisfied so far.

4

Technical Support / Re: 10 Stop ND Filter - Metering

« on: May 03, 2013, 09:19:27 AM »

If you are like me and have trouble calculating 10 stops there are iPhone apps like NDTimer and Long Time that will do the hard work then use your histogram to fine tune.

no that´s not a problem

and the live view actually works pretty good.
it was always in the ballbark with my testshots.

i only wondered why the normal metering is so completely wrong.

5

Technical Support / Re: 10 Stop ND Filter - Metering

« on: May 03, 2013, 09:14:46 AM »

Because the 10-stop ND does not allow sufficient light for the metering sensor to work, whereas Live View is using the more sensitive CMOS image sensor for metering data.

FWIW, I usually compose, meter and focus before putting the 10-stop on, then just adjust the exposure by 10 stops.

oh i did not know live view uses the sensor for metering too.
thx for the info.

but i guess it makes sense.. for the metering sensor to receive light you need the mirror to be down too i guess? same as for the AF sensor.

6

Technical Support / 10 Stop ND Filter - Metering

« on: May 03, 2013, 09:04:13 AM »

i got  my 10 stop ND filter today. 

now i wonder why the metering is completely off.
i knew it would maybe not be 100% accurate, but my 550D shows me 1/100s or 1/200s when a correct exposure is around 10 seconds.

but when i use live view the metering is correct.

why is that?

7

Speedlites, Printers, Accessories / Re: Kenko Teleconverters... im so confused.

« on: April 20, 2013, 10:40:34 AM »

just to let you know.. i bought a Kenko 1.4x Pro 300 DGX (blue point).

i have done a few quick and dirty testshots the last 2 days in my backyard and so far it works great.

next weekend i can test it against the canon 1.4x III but i doubt the canon can be noticable better. maybe when shooting testcharts.

anyway i got it for 147 euro used (4 weeks old) on ebay and that is hard to beat. 

8

Lenses / Re: Why aren't zoom lenses faster than 2.8?

« on: April 18, 2013, 08:23:57 AM »

A 100-400mm f/1.2 lens (which will never exist) would need to have a 333.3 mm (13") front element - a practical impossibility.  Your comment about needing an 83mm front element for the 100mm end isn't relevant - the front element can't change size so the optics must be sized for the long end.  That's why the 100-400mm lens is a variable aperture zoom with an f/5.6 long end - if it was f/4.5 throught the zoom range, it would need an 89mm front element.

so what he meant is a CONSTANT aperture 100-400mm f1.2?

yeah sorry,  then i was stuck to much in reality... 

9

Lenses / Re: Why aren't zoom lenses faster than 2.8?

« on: April 18, 2013, 07:30:30 AM »

It is quite easy actually. If you want to know what size it would require just divide the focal length with the required f-stop and you'll see what size the front element diameter would be. So, for a 100-400mm f/1.2 the front element would be 33,3cm in diameter. 

If you divide the focal length with the diameter of the front element you'll get the maximum f-stop for that lens.

33,3 cm...wow!!!

i don´t quite get the math.... 

can you show how f1.2 gives 33,33 cm on a 100-400mm lens?

it´s more like 83mm for the 100mm end.

by the way:

The number for lens f/stop in photography (for example, f/8) is the ratio of lens focal length divided by the effective lens aperture. Aperture is not the obvious physical diameter, but instead is the apparent "working" diameter as seen through the magnification of the front lens element.

10

EOS Bodies / Re: Canon 5D MK3 or 6D Replacements... when?

« on: April 18, 2013, 06:31:34 AM »

No digital camera is an investment.  They are all rapidly depreciating expenses.  Determine if you really can't do
what you like with your current gear and if the answer is "no", then go buy something that will.  Whatever you choose, there will be a better choice in six months.

he does not see that camera as investment... not as an investment that grows.
but he wants to spend/invest his money for the right stuff.

as most people do who work for their money. 


so it´s absolutely fine to aks if there will be a better option in the "near" future.

11

Lenses / Re: Why aren't zoom lenses faster than 2.8?

« on: April 18, 2013, 06:27:23 AM »

they are.. from now on. 

12

Lenses / Re: Sigma 18-35 F/1.8 just announced?!

« on: April 18, 2013, 05:13:07 AM »

excuse my ignorance.... but why all the world on the net is talking about this lens to be equal to a f2.7 (f2.9) FF lens?

f1.8 is f1.8.... ?

here too:

So it's 18-35 f/1.8 for APS-C, making at a FF-equivalent of 29-56 f/2.9

i mean when i put a 50mm f1.8 on FF or APS-C it´s an f1.8 lens.

In terms of DoF

then they have to write that. 
because DOF is not everything.

in terms of speed it´s an f1.8 lens.

13

Lenses / Re: Sigma 18-35 F/1.8 just announced?!

« on: April 18, 2013, 05:04:42 AM »

excuse my ignorance.... but why all the world on the net is talking about this lens to be equal to a f2.7 (f2.9) FF lens?

f1.8 is f1.8.... ?

here too:

So it's 18-35 f/1.8 for APS-C, making at a FF-equivalent of 29-56 f/2.9

i mean when i put a 50mm f1.8 on FF or APS-C it´s an f1.8 lens.
exposure does not change.
 

14

Third Party Manufacturers / Re: Nikon D800 Value Dropping?

« on: April 13, 2013, 06:20:37 AM »

i think we don´t speak about the average joe shooter here who buys a 2500$+ camera and is using P mode?

sure such people exist... as pensioners exist who buy fast cars only to drive them at 80 km/h max.   

many DSLR owners would be better served with a P&S camera, because they use them as P&S camera anyway.
 

15

Third Party Manufacturers / Re: Nikon D800 Value Dropping?

« on: April 12, 2013, 06:10:07 PM »

D800 cost 2260 euro here compared to 2979 euro for the 5D MK3 (both on amazon).
so the D800 price is not bad.

thought you need very good glass and you have to use a tripod to make best use of the 36 MP.

if you are a lazy handholding shooter and don´t want to spend so much money for the best glass you are better served with a D600. i think many notice that after a while.