Diffraction on smaller aperture values TEST

posted on 14th of august, 2012

This post was continued with some tests: https://www.dreamstime.com/thread_29668

Test finished (at least, a preview).

Test subject: a small part of acrylic on canvas covered with varnish (lake protection). For next test I will use a towel (thanks Afagundes).

Test conditions: Nikon D90 body, Nikkor 35mm f/1.8 AF-S DX, f/1.8 - f/22, Giottos MT9361 tripod, exposure delay mode ON (anti-vibration).
Tethered shoot (aperture changes was made from PC so the body was not moved).
Original Jpeg from camera (Standard, ISO 200, Noise reduction OFF, Long exposure noise reduction...

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Comments (5)

Posted by Alvera on August 19, 2012
You're welcome.
Posted by Giannit on August 19, 2012
Thanks for share with us this very interesting test!
Posted by Egomezta on August 14, 2012
Thanks for sharing...

Comments (5)

This article has been read 900 times. 2 readers have found this article useful.

Nikon VR On or Off? How to see in EXIF.

posted on 17th of august, 2012

Sometimes you want to see if a photo was taken with VR On or Off. Usual image editing or viewing software don't show this.

This is how I do:
- Download Exiv2 from here:
- Windows version is here:
- Unzip in a root folder, I put it in C: because you will have to write a command line in Command window and will be easier.
- Copy your photo in that folder.
- Start - Run - Command to open the black Command window.
- Make sure at your cursor is C:> then type: cd exiv2
then type: exiv2.exe -g Exif.NikonVr.VibrationReduction Your_photo.jpg
(-g will display only VR related exif info).

A message like this: "Exif.NikonVr.VibrationReduction Byte 3 On" means that your VR was ON.
If not, you will see...

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Comments (13)

Posted by Psmpics on August 29, 2012
Another way to do this is with the free Nikon ViewNX 2 software. From the browser window you can:
1. Right-click any image.
2. Choose "Copy File and Camera Information".
3. Open a text editor, e.g., Word, Notepad, and then paste the contents from the clipboard.

Included among the details listed, is "VR: ON" or "VR: OFF".

For a brief description of ViewNX 2 and a link where you can download it, see my blog post Top 5 Reasons People Don’t Shoot RAW.
Posted by Laurasinelle on August 22, 2012
Thanks for sharing! Good to know!
Posted by Alvera on August 21, 2012
Thank you. VR off from now on.
Remember, only on telephoto :)

Comments (13)

This article has been read 2614 times. 2 readers have found this article useful.

10,000 views on my blog today!

posted on 24th of august, 2012

10,000 views on my blog today! And counting.
Alvera photo - my journey in the microstock world
This external blog was made last year in november and it's not a very sophisticated blog. I use it for redirect buyers to my images from dreamstime. This blog brings me also some referrals.
I use it also to give buyers more info about my photos and IDEAS about how to use the images.
If you have a blog too, please add me there, I will add you too.
Thank you! Wish you peace and love and many sales!

Comments (4)

Posted by Parkinsonsniper on August 28, 2012
You deserve it friend :) I have a blog too, but it's not even close to yours. http://parkinsonsniper.wordpress.com/ check it and give me some advices about what should I do to make it alive! :)) it looks dead, even to myself!
Posted by Alvera on August 28, 2012
Thanks Celiaak, hope your site have a follow by email option?
Posted by Celiaak on August 28, 2012
I use to visit your blog articles from the Google+ stream. That way I never miss a post :)

This article has been read 1366 times. 2 readers have found this article useful.

Don't trust what they write ON plastic! Trust only what you test!

posted on 29th of august, 2012

Three SD cards tested, see here what is write on them: What they write on label - click here

Tested with h2testw_1.4 (google for it, it's free and small).

Sandisk Extreme class 6 (20 MB/s* on label) - 4 GB capacity
Writing speed tested: 12.3 MByte/s
Reading speed tested: 14.1 MByte/s

Sandisk class 2 - 8GB capacity
Writing speed tested: 5.40 MByte/s
Reading speed tested: 7.32 MByte/s

HAMA class 6 - 8GB capacity (don't know why Hama has a 10 in a circle and a 6 in another circle).
Writing speed tested: 12.3 MByte/s
Reading speed tested: 14.0 MByte/s

Trust me, on a DSLR camera in high speed mode you will shoot about 6-7 photos at high speed and after that the buffer will be full and SD...

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Comments (15)

Posted by Alvera on September 09, 2012
no, they don't will be interested :) they have an * after that number (special testing condition) and the write speed is never published.
Posted by Miraclemoments on September 09, 2012
Yes...maybe you should direct an email to them and find out what they say...will be interesting to hear what they say.
Posted by Alvera on September 09, 2012
don't know, maybe are fakes, pirated
With this "30 mbps ultra" my d90 shoot about 8 NEF at full speed and after that about 1 photo per second. At action photography 1 fps is very low :(

Comments (15)

This article has been read 1999 times. 6 readers have found this article useful.

Motion blur on subject

posted on 31st of august, 2012

I made some photos at a drifting race. First one was approved today. I want to share my technique. First of all, you will need a shutter speed of about 1/8 - 1/20 sec. This is beyond my anti-shake abilities with a 450 mm lens so I use a tripod. Also, I pre-focused on the road - see photo below. But this is not all. Because it was a sunny day and my camera can do only 1/4000, I used a neutral density filter ND8 which gave me minus 3 full stops so with a f11 or f9.5 I was able to lower my shutter speed at 1/10. The result was a very sharp background and a motion blurred car (two cars in this photo). Hope more photos will be approved, I have one at 1/6 and the car is so distorted - a ghost on the street! Wish you luck! Oh, btw, in this case I saw the limitation of my low speed cards - see the previous blog....

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Comments (5)

Posted by Alvera on September 04, 2012
Thanks. One more approved.
   Image not available or id is incorrect.   
Posted by Giannit on September 03, 2012
Great technique.... congrats.
Posted by Alvera on September 01, 2012

Comments (5)

This article has been read 957 times. 1 readers have found this article useful.

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