March 02, 2015, 12:09:19 AM

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 - mb66energy

Pages: [1] 2 3 ... 32
1
EOS Bodies / Re: Patent: Improved EF to EF-M Adaptor
« on: February 24, 2015, 03:17:42 PM »
The master lens is called   EF-M 70-200  f/2.8 IS    in the patent (strange?!) ...

But I am confused by the EF-M 70-200 ...

The patent makes no such reference.  Egami's blog does.
The lens isn't named in the patent filing.
Egami refers to is as EF-M 70-200 in one place, and just as 70-200 elsewhere.

I wouldn't take machine translations as gospel  ;)

Thanks lw ! - You saved from a sleepless night! - Best, Michael

2
EOS Bodies / Re: Patent: Improved EF to EF-M Adaptor
« on: February 24, 2015, 12:43:43 PM »
The master lens is called   EF-M 70-200  f/2.8 IS    in the patent (strange?!) ...

The lens adapter might istself work as
  (1) an IS unit
  (2) AF aid by wobbeling one lens element:

Ad (2): My idea is about the correlated action of a lens moving forth and back with e.g. 30 Hz and
a contrast detection on the sensor. The cameras processor can decide which lens position
gives a better contrast detect and knows the direction where to focus the main lens
based on the wobbeling lens element position and the sensor contrast detect signal.

If the main lens has achieved right focusing the wobbeling is stopped. An ingenious idea that might be
as effective as phase detect and accurate like contrast detect.

But I am confused by the EF-M 70-200 ...

3
EOS Bodies / Re: Possible Canon EOS 5D Mark IV Spec Talk [CR2]
« on: February 23, 2015, 01:00:27 AM »
I don't want to buy two different bodies with different capabilities where I have to swap the lenses to use each bodys special features. I am very impressed by the 5Ds's but what body to choose? Prices are o.k. but I would easily pay 4000 €/$ if they had made a switchable low pass filter.

You okay with that switchable filter requiring you to partially disassemble the body?

https://support.red.com/entries/100226366-DSMC-Interchangeable-OLPF-System-FAQs#q10

"You will need to use a T6 Torx driver to install and remove a DSMC Interchangeable OLPF and an LED flashlight (or similar) to ensure no debris or contaminants are visible in the optical cavity before inserting an interchangeable OLPF.

NOTE: It is not required, but RED highly recommends performing an OLPF swap in a cleanroom environment."

I wrote switchable and it meant literally switchable by menu or a hw switch.

I know...and that isn't really possible the same way switching lenses isn't a menu switch.  Yeah, others have tried vibrating the sensor for AA filtering, but that approach hasn't yet proven to be both effective and without side effects.


I am not shure if this is impossible ... thinking of smart materials whose opical properties can be cmhanged by applying a voltage (DC or AC). Perhaps it's a technical problem with 50 MPix, but feasible with 12 MPix.

4
EOS Bodies / Re: Possible Canon EOS 5D Mark IV Spec Talk [CR2]
« on: February 22, 2015, 05:05:20 PM »
I don't want to buy two different bodies with different capabilities where I have to swap the lenses to use each bodys special features. I am very impressed by the 5Ds's but what body to choose? Prices are o.k. but I would easily pay 4000 €/$ if they had made a switchable low pass filter.

You okay with that switchable filter requiring you to partially disassemble the body?

https://support.red.com/entries/100226366-DSMC-Interchangeable-OLPF-System-FAQs#q10

"You will need to use a T6 Torx driver to install and remove a DSMC Interchangeable OLPF and an LED flashlight (or similar) to ensure no debris or contaminants are visible in the optical cavity before inserting an interchangeable OLPF.

NOTE: It is not required, but RED highly recommends performing an OLPF swap in a cleanroom environment."

I wrote switchable and it meant literally switchable by menu or a hw switch.

5
EOS Bodies / Re: Possible Canon EOS 5D Mark IV Spec Talk [CR2]
« on: February 22, 2015, 01:08:52 PM »
I don't want to buy two different bodies with different capabilities where I have to swap the lenses to use each bodys special features. I am very impressed by the 5Ds's but what body to choose? Prices are o.k. but I would easily pay 4000 €/$ if they had made a switchable low pass filter.

IMO a logical new incarnation of the 5D main line would have 22-30 MPix, the same frame rate, 4k video and high DR/colour accuracy/good high ISO capabilities and excellent ergonomics. Add wifi and a tilt screen for situations where you have no access to the OVF.

Bringing four or five 5D flavours to market is only logical from the marketing side: Sell more bodies. The moderate prices for 5Ds and 5Ds R might be a hint for that transition.

More and more I tend to buy a 5D classic or two if I switch to full frame and check if full frame is interesting for me.

6
Lenses / Re: Which Lens to buy for Portraits
« on: February 19, 2015, 11:34:37 AM »
I am not specialized in portrait but I had the chance to do 10 shots of four rap musicians - spontanous shot with natural light in a park. They had seen my 40D with the EF 2.0 100 and asked if I am a pro photographer ...

My experience was that the lens is very fast / easy to use. It is small enough not getting in the way: Well balanced camera and - more important - I think it is very decent for those who are photographed.
The optical quality is superb, see the links of ajfotofilmagem . The photos I have made were done at f/4 and show a high fidelity - not only sharpness but also the fine textures of skin and hair.

If I can put the flexibility into my feet without being restricted by walls it might be a good option which will still work on a FF body - if you operate in limited space a zoom might be the better option. Or a second 650D with your 50mm lens mounted. I prefer to have two bodies with me to reduce the amount of lens changes ...

7
EOS Bodies - For Stills / Re: Coincidence or?? MP/SEC
« on: February 16, 2015, 03:22:41 PM »
I guess it is the speed of the ADC units. 14 bit at a rate of roughly 0.5 Gigasamples is fast, just today, if you need accuracy and repeatability.

Another reason might be the data transmission speed inside the camera. 500 x 14 bits means 500 Mhz bandwidth for a 14 bit parallel bus or 7 Ghz bandwidth for a single serial bus. Compare processor speeds which stagnate at roughly 2.5 Ghz for mobile devices (Notebooks) or 1.2 GHz (smarphones).

For the 7D ii: The limit isn't perhaps the internal processing or data transfer speed but the speed of the mirror / shutter mechanism at the given cost of the camera for Canon.

8
Photography Technique / Re: What is your keeper rate?
« on: February 16, 2015, 02:22:03 PM »
Some thoughts why I consider to buy the 5Ds(R) to enhance my keeper rate:
  - 60 MByte files are not easy to handle - minimaze image count from the first technical step:
    Pulling the trigger
  - to get out the most of 50 MPix a tripod is needed for many situations - slows down the process of
    taking a photograph, make composition much more reliable
  - using the APS-H or APS-C mode might be very powerful to have objects in the view which are
    just outside the image border: to avoid them or include them ...
    might just interesting for action oriented photography to enhance the control during fast composition /
    framing

And no plan to update my computer: Make things right from the first step and it will be a joy to wait 30 seconds before the image appears!

(2ct of a man who is tired from our fast & furious world ...)

9
Photography Technique / Re: What is your keeper rate?
« on: February 16, 2015, 02:15:57 PM »
+1 privatebydesign, mb66energy, Zv - and possibly others!

Since I pretty much keep everything (disk space is cheap, though backups can be painful), that definition of "keeper rate" is not very useful? Then there is "technically ok" but could still be flawed in many other ways.

My best go on 500px, with some extras at Flickr. I have 140 photos at the former, from 10s of thousands of original shots still on disk. What's the "keeper" here?

At the moment I switched from storing nearly everything on the disk to the following procedure:
  10   create a new directory on the external disk named DIGI_ROLLS like   YYYY-MM-DD_some-description
  20   copying files from a camera to an external disk
  30   batch renaming these files to insert a unique ID from IMG_1234.cr2 to IMG_EOSM_001234.cr2
  40   if a second camera's files have to be transferred GOTO 10
  50   copy the directory to my PC
  60   check file numbers / directory size
  70   delete files on memory cards after checking roughly creation date, file count

The idea behind that procedure is the following:
  - it is now easier for me to make an "image file deletion" party - everything is on disk.
  - backup is much smaller
  - if the DIGI_ROLLS drive is full I can buy another one
  - if the DIGI_ROLLS drive fails in 2 months or 3 years and there was no need to use it to
    restore files I deletet accidentally ... so what ?

Know I need time for photography and the right light ... waiting for spring.

10
Photography Technique / Re: What is your keeper rate?
« on: February 16, 2015, 10:53:16 AM »
Technically (IQ is what camera / lens deliver):
  Action (I do not very often): 30%
  Documentation: 50%
  Still Life and landscape: 50%
  Still Life and Landscape with tripod: 100%

Photographically o.k.:
  roughly 1% from the technically good photos ...

Artistically:
  Well below 1% from the photographically o.k. photos (1:20000 from all exposures)
  resulting in 2 or three photos I am really satisfied with per year ...

11
Lenses / Re: Why does 7D II seem COMPARATIVELY soft with certain lenses?
« on: February 16, 2015, 08:01:16 AM »
Just a remark about potential differences in the 7D ii sensor compared to similar cameras (in terms of SENSOR) ...

Maybe it is the result of microlens array placement. For me it makes sense to optimize the 7D ii sensor for medium to large telephoto according to its main field of use.
I checked some comparisons with the great 18 MPix sensors  ;) of 60D/600D/EOS M and the 7D ii where you can see that the vignetting is stronger in 7D ii compared to the other cameras for wide angle and less pronounced for a longer focal length.

Another reason might be the low pass filter which might be slighly stronger than in 60d e.g. (see third link).

Differences of vignetting were derived from the test chart image brightness visually.

EF 2.0 200

600D vs. 7D ii
http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=458&Camera=759&FLI=0&API=0&LensComp=458&CameraComp=963&SampleComp=0&FLIComp=0&APIComp=0
 - slightly better resolution for 7D ii and less vignetting

EOS M vs. 7D ii
http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=458&Camera=812&FLI=0&API=0&LensComp=458&CameraComp=963&SampleComp=0&FLIComp=0&APIComp=0
 - similar resolution but less vignetting for 7D ii

http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=960&Camera=736&FLI=0&API=0&LensComp=960&Sample=0&CameraComp=963&FLIComp=0&APIComp=0
 - visible moiree for 60D in the MID FRAME image (diagonal lines) as orange "lines" from 11 o'clock to 5 o'clock.
EF 2.8 40

60D vs. 7D ii
http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=810&Camera=736&Sample=0&FLI=0&API=0&LensComp=810&CameraComp=963&SampleComp=0&FLIComp=0&APIComp=0
 - very similar results

EF-S 2.8 24

60D vs. 7D ii
http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=960&Camera=736&FLI=0&API=0&LensComp=960&Sample=0&CameraComp=963&FLIComp=0&APIComp=0
 - slightly better resolution (esp. in the center) for 7D ii but less vignetting on 60D

12
Canon EF-S and EF-M Lenses / Re: Canon EF-M 22mm f/2 STM
« on: February 09, 2015, 04:40:52 PM »
EOS M combined with the 22mm is a great thing: A worthy successor of these classic 35mm lens compact cameras of the 1970s.
The body has it's quirks - mainly because I feel operating a smart phone with EF-M bayonet due to the inferior ergonomics.
But the IQ of the 22mm with the EOS M is great - not only in terms of sharpness but also in terms of contrast and plasticity 3D-look of the images. Two examples for this gallery page ...

13
Lenses / Re: New Unique Macro Coming? [CR1]
« on: February 08, 2015, 04:05:07 PM »
Just today I dreamed about an EF-M 50 f/2.0 IS USM-STM lens. USM for speed, STM for video ...

14
EOS Bodies / Re: Who is going to buy the new 5Ds's?
« on: February 05, 2015, 10:27:13 AM »
I skipped a lot of cameras I was interested in at the first glance:
5D mk ii, mk iii, 7D, 6D, 7D mk ii

At the moment I am searching for a "decade lasting body" and the 5Ds might be an option. I am lusting for a camera fit to do excellent A0 prints if you have THE IMAGE.
And I am lusting for a camera with a 12 million image pixel sensor consisting of R-G-G-B pixel quadruplets for cleanest colors.
5Ds might deliver for both applications.

It is an option for me ... if the camera ist roughly 3500 $/EUR (my first estimate) ... After reading the Canon press release I am no longer shure about my estimate ... and I fear it will be 4999 $/EUR.

Standing by and waiting for more date, reviews and especially sample photographs/"experience reports".

15
EOS Bodies / Re: Full Specifications of the EOS Rebel 760D
« on: February 05, 2015, 08:36:34 AM »
What is the advantage of the screen on top?  I know I've read that people like to be able to look down at the camera and see all the settings, but is that the main thing?  I find the same information on the back screen on the Rebel and for my eyes it is usually in a bigger font / easier to read.

I'm really in the market for a body upgrade from my T1i and am curious if the 760D actually offers anything truly useful over the 750D besides the top screen.  If indeed you can only remote control the 760D via phone, then that is a feature that would be really handy to have.

Advantages of top LCDs
1) view of all parameters of camera and lens settings with one view (including distance setting, zoom setting)
2) better simultanous view of important controls and settings
3) better daylight visibility (esp.under direct sunlight) - much higher contrast (for me the higher contrast is more important than bigger letters)
4) power efficiency (as said from other member): top LCD: near zero, touch screen: roughly 0.2-0.5 Watts (estimated)
5) viewable if camera around neck.
6) ...?

EDIT: Forgotten to mention that I like to shoot in manual mode (measuring with spot) to reduce surprices in terms of exposure.

Pages: [1] 2 3 ... 32