August 29, 2014, 10:48:19 PM

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - Lawliet

Pages: 1 ... 10 11 [12] 13 14 ... 25
166
EOS Bodies - For Stills / Re: 1D X NOT compatible with Pocket Wizard!
« on: April 12, 2013, 04:09:10 PM »
I feel ok since the current beta firmware supports normal manual control with the 1D X, including AC3 and blended TT5/monolight control.
I actually prefer the 1Dx-version over the TTL-capable default - power tracking for manually controlled speedlights is more helpful then the TTL-inherent randomness if one works with changing apertures. Makes me wonder if that will transfer to the other cameras... :)

167
Lumens, not watts! 

To get an exposure you need lms/m2, lumen-seconds/square meter. Good thing: flashtubes have about 40lm/w and a flash duration shorter then the sync time, so all strobes set to say 100Ws produce the same 4000lms, about the same as four 30W CFLs in one second (or a 650W halogen during a 1/5s exposure)

168
Lighting / Re: Does the flash pulse when <x-sync & hss on?
« on: April 06, 2013, 01:55:30 PM »

Indeed, my 60d also doesn't to a proper exposure reduction to x-sync but just overexposes -

My old 30D had safety shift, that stopped down until sync speed was ok if required. Did the rip that out?
(That way you lose only the stops from the exessive light value, but don't have to pay the HSS-price, about 40% more flash range)

169

You guys know the min light(watts) I should be looking for? or any good suggestions?


At 2m with a rect. softbox in the 2'x3' to 4'x6' range I need about 150Ws to get f/11; a bit more with very narrow boxes or grids. With a white BD you're in the same ballpark. If you're in a confined space without black light absorbers the walls will act as fill cards, giving you more, although uncontrolled, illumination.
Keep in mind that you might want to dial light down, either to fill in shadows or to shoot wider open or with inherently more efficient tools. Thats where to much power and a narrow range is a problem.
(From a european perspective the elinchrome RX one or renewed D-lite2 are an interesting entry level offering. Enough power for indoor use, a clean accessory/upgrade path and they can be remote controlled via iPhone or PC - at a price point compareable to chinese imports.)

170
Once you reach the resolution limit of the lens, the sensor will represent the image the best it can.  If the data is not there it will be soft. 

Thats not how lens resolution works - instead higher frequency detail gets dampened, like in a low pass filter. More resolution just means slightly lower contrast for microdetail. Thats unless lens aberrations convolute detail in a nonrecoverable way, but the new canon lenses show little tendency to do so.
(But even with perfect lenses we're sooner or later have to choose between lack of DOF and diffraction...)

171
Canon always differentiate their product line, so I feel if it was a new line in a 5d style body they would separate it from the 5d line by lowering fps and autofocus.

They could differentiate upwards. 1DX AF and metering, all the other bells and whistles(how much would freedom from the shackles of x-sync be worth?), and charge an adequate premium. Keep in mind that the 5D3 will be at the half of its product cycle by then...

172
Speedlites, Printers, Accessories / Re: Flash life of speedlites?
« on: March 19, 2013, 03:24:44 PM »
i read that article when he posted it.. and honestly think the number is too low.
he gave no creditable source for his information.

Looking at the actual data sheets of various flash tubes: something in the 1-10k pops range is quite common, if those discharges are at 30% of their explosive energy. Drop the energy to 10% and we're at about 50k flashes. Given the size auf the average flashguns tube and the energy in the caps the latter number seems to be closer to reality, w. reduced output on the flashgun following the progression I'd expect other parts to give first...cavet emptor, rough estimate.
Bad thermal management or shock are a bad idea otoh.

173
Canon General / Re: your scariest photography moment?
« on: March 11, 2013, 01:29:20 AM »
what silly thing have you done?
Maybe the most uncalculateable dangerous, individual reactions varied:
Some environmental fashion shots in the aftermath of the Tel Aviv fashion week.
A perfectly reasonable idea, even got free assistants in uniform.
Until someone decided that rockets coming our way would spice things up.

More leaning to the silly side: having an assistent set up some HMIs for cont. light shooting and not double checking everything. The guy must have missed the memo about the need for heavy UV filtering(and never overriding the safty switches detecting those filters) & about everything started to look like painted w. daylight flourescent paint at the moment htat light came on. Lesson learned: never assume someone has taken care of it, make sure it has been done properly...

174
Lenses / Re: 70-400/ f4.0-5.6 Zoom ... Canon, where are you?
« on: March 05, 2013, 09:05:08 AM »
It is therefore NO alternative to a newly designed, excellent 100-400 II

It doesn't need to, it just closes the proverbial box.
With more attractive alternatives up- and downward plus sides that make a lateral breakthrough difficult we're looking at a limited audience with lots of options.
About the same dilema the 24-70/4 faces, but from more angles.

175
Lenses / Re: 70-400/ f4.0-5.6 Zoom ... Canon, where are you?
« on: March 05, 2013, 04:15:58 AM »

Not able to stick a new 4-stop IS into the current 100-400

In a way they did just that, plus an 0.7TC in the lens design to obscure it. Lets assume the 200-400 eventually becomes available to paying customers the actual utility of a new 100-400 would be reduced again, as in either 300mm is enough or I'd prefer closer to 5-600mm. With the high MP numbers common cropping is much easier then dealing wit a to narrow FOV.

176
I'm sure there are times when extracting stills from video can be great.

There is one severe problem: Video relies on motion blur to gloss over the only 24fps thing, while stills should freeze motion. Doing both the same time sounds challenging, at least if you want to use the video stream.
(Not that I'd use the same composition or lighting for two essentially different media, but thats a matter of style)

177
Reviews / Re: Review - Canon Speedlite 600EX-RT
« on: February 27, 2013, 03:14:10 PM »

Li-ion chemistry is optimal for sustained, moderate-current discharge, and a flash needs brief, high-current discharge to fill the capacitor. 

True for LiCo cells, you comfortably get about 15W out of something camera sized, i.e. about 5s recycle time.
But change the cobalt for iron phosphate and the tide turns, you'd fry the caps and the flashtube long before the battery gets remotely taxed - cells rated for cont. 30C and peak 100C+ discarge means multiple full pops a second. (Profotos B4 uses such a battery, something 1/10 the size for a 50Ws flashgun?  :o 8) )

178
Lenses / Re: Why aren't zoom lenses faster than 2.8?
« on: February 21, 2013, 09:38:33 PM »
Canon used to make a 25-100 F/1.8

Keep in mind that this is a cine lens - about the image circle of an EF-s.
If one took a common 70-200/2.8 and welded an inverse TC2 to it he'd get an 35-100/1.4. Makes me think of the fast 4/3rds zooms...
Now the same trick for EF would require a f/2.8 zoom for medium forma (6x9 should work, 6x7 feels like a tight fit)as a baseline. Not pretty.

179
Lighting / Re: Weird ettl ec behavior - is this just me?
« on: February 21, 2013, 07:55:17 PM »
after all afaik only the 1dx series has rgb metering (and of course cheaper Nikons, doh).
side note:
Depends on how you define RGB-metering. The iFCL-capable cameras are actually dichromates, not the best color sensitivity, but a rough idea instead of color blindness. Basically they can detect red and blue, but green and white look the same to them.

180
EOS Bodies / Re: 2013 Predictions for Canon EOS Products
« on: February 21, 2013, 07:30:48 PM »
I actually hope Canon keeps the AA filters a part of their lineup, and if they ever decide to create a camera without one, that they always make it an OPTIONAL body subtype.

Canon gave DPP that IPSF tool to deal with the negative aspects of the AA filter and some lens errors - they gain less then Nikon from leaving the filter out. Not that the difference is that large, at least once you're out of the lab.
I'd guess the filter stays, esp. with Canons affinity to video and the problem off removing artefacts from that many pictures. Thats unless common sense has to take a backseat because of marketing decisions.

Pages: 1 ... 10 11 [12] 13 14 ... 25