Bee on thistle (studio stack)
Moderators: rjlittlefield, ChrisR, Chris S., Pau
-
- Posts: 674
- Joined: Sat May 01, 2010 6:12 am
- Location: Nice, France (I'm British)
Bee on thistle (studio stack)
(image links to flickr page with larger version)
This bee had been caught by a spider, and died on this thistle.
Nikon D90, Rodenstock APO-Rodagon-D 75mm f/4 1:1, Nikon PB-4 bellows, StackShot @ ISO 200, 1/10s, f/5.6. This lens is like an enlarger lens, but aimed at duplication. Optimal magnification is 1:1 with a design range of 0.8 - 1.2x. Here it is used at 1x as near as I can judge.
Diffuse natural daylight from a nearby window.
Images developed in Nikon CaptureNX 2. Stack of 66 images in Zerene Stacker, PMax method. First stack with the StackShot, which arrived yesterday. 0.2mm step size.
In fact I shot at 0.05 step size, which was too fine; I ended up using only one in four images for the final stack. Also, due to inadequate support and slight wind from a fan, the subject was slipping from right to left ever so slightly, then a bit faster at the end; the images with the wing in focus had to be discarded.
I see that I have a couple of hot pixels, and in the full 4k version these can clearly be seen as a dotted trail as the subject gradually shifted. Need to edit these out before stacking, next time.
Subject support was suboptimal, the plant was taped to a cardboard box before getting the StackShot I had been focussing by moving the rear standard of the bellows, so I could mount the subject on a Nikon PS4 slide holder which attaches to the front of the bellows. Here the StackShot moves the entire bellows assembly so the subject needs to be mounted on a separate stand.
I see that ZS has not been thrown by thistle spikes in the background overlaid by a semi transparent bee wing in the foreground.
- rjlittlefield
- Site Admin
- Posts: 23606
- Joined: Tue Aug 01, 2006 8:34 am
- Location: Richland, Washington State, USA
- Contact:
Re: Bee on thistle (studio stack)
Very nice, Chris. This is the point where we usually suggest moving out of the Beginners forum and up into the regular galleries, Technical and Studio in this case. The galleries get a lot more viewer traffic, so generally you'll get a lot more comments there.
--Rik
The easy way to measure scale is after you're done photographing your real subject, swap in a ruler, focus that without changing the optics, and take one more picture. Strictly speaking, the scale that you get will apply only to the first frame in the ZS input files list as ordered after stacking, but it will generally be within a few percent for the whole stack.ChrisLilley wrote:Here it is used at 1x as near as I can judge.
I assume you have some nice automated way to do this. What is it? Does CaptureNX provide some sort of defect map?...hot pixels...dotted trail as the subject gradually shifted. Need to edit these out before stacking, next time.
It depends on the method. DMap often has trouble handling overlapping structures; PMax usually handles them well except for the common "transparent foreground" artifact.ZS has not been thrown by thistle spikes in the background overlaid by a semi transparent bee wing in the foreground.
--Rik
-
- Posts: 674
- Joined: Sat May 01, 2010 6:12 am
- Location: Nice, France (I'm British)
Re: Bee on thistle (studio stack)
I wasn't far out. Photograph-the-ruler gave me a magnification of 1.07rjlittlefield wrote:The easy way to measure scale is after you're done photographing your real subject, swap in a ruler, focus that without changing the optics, and take one more picture.ChrisLilley wrote:Here it is used at 1x as near as I can judge.
Some raw converters, like dcraw and libraw, have a nice facility where a file of x y positions (and dates!) of hot/black/stuck pixels is read and the relevant pixels nulled out.rjlittlefield wrote:I assume you have some nice automated way to do this. What is it?...hot pixels...dotted trail as the subject gradually shifted. Need to edit these out before stacking, next time.
CaptureNX does not seem to. I was planning to either zap them one by one in an image editor or, alternatively, use a tool like PixelFixer
http://www.pixelfixer.org/
Yes, this is PMax.rjlittlefield wrote:It depends on the method. DMap often has trouble handling overlapping structures; PMax usually handles them well except for the common "transparent foreground" artifact.ZS has not been thrown by thistle spikes in the background overlaid by a semi transparent bee wing in the foreground.
- rjlittlefield
- Site Admin
- Posts: 23606
- Joined: Tue Aug 01, 2006 8:34 am
- Location: Richland, Washington State, USA
- Contact: