I made this to give me an idea of what i'm seeing....i print it out the size of the sensor used...it's not exact but it does the trick http://www.photomacrography.net/forum/userpix/1464_CHART_1.jpg Perhaps I miss the point, but shouldn't it be something like this? http://www.photomacrography.net/fo...

I am the book author, and I had one previous record of a customer unable to download the files. Unfortunately I did not hear from him/her again, so I was not able to identify the problem. A first thing to try is to access the download page with the alternative address: http://savazzi.freehostia.com/...

I will also attest that it happens. But since I have not been able to diminish the subject movement by enclosing the subject almost entirely within stiff plastic diffusion material and cardstock reflectors, I’ve discounted the possibility that the entire effect can be ascribed to air movement cause...

...very short flash durations (like 1/5000s) may create problems with non-linear sensor response (=reciprocity failure) and color shifts. The color spectrum emitted by flash tubes also changes at very short flash durations. I've not heard of reciprocity failure with digital sensors, and all the sou...

Would the long flash duration be a problem solely for freezing movement on an unstable setup, or is there some other reason to avoid it? Aside for the different effects on motion/vibration freezing, a long flash duration (on the order of 1/250-1/500s) has no negative effect I can think of. On the c...

But the continuing increase in the price of lenses like the formerly inexpensive 35mm Noflexar indicates that the market may not saturate that readily. :) This is another interesting "urban legend". I have two, tested one, and did not find it especially useful in UV photography (large focus shift b...

For instance, the EL Nikkor 63 mm f/3.5 for a while used to sell (or at least to be advertised) above 1,000 $ after being reported as particularly good for UV photography, but after it was found that most of the other EL Nikkors perform just as well it fell through the floor. The old-style EL Nikko...

I agree that when someone talks about a nice lens prices go up pretty fast, but if noone talked about this lenses we would not know the even exist. So it is a price we have to pay for that valuable information in forums like this one Regards It is probably true, and I do expect that sellers continu...

A fungicide chemical that don't attack the balsam would be the best approach, but what one? You might try thymol first (it will kill growing molds but I am not certain it can kill spores). Thymol vapors act slowly, so you need to store the slides and a small amount of thymol in an air-tight contain...

Here is a comparison of lenses. The tulip was in bright sunlight, facing the sun but I used a diffuser between the sun and the flower. Exposure was locked on that for the tulip leaves under diffused light. Aperture f11 ISO 400 hand held: Olympus Zuiko OM MF 50mm f3.5 macro: I do not mean to be too ...

The thing as I said is that I am considering buying a 1.4xTC but difficult to find any old good ones, most 1.4X TC are modern type with AF (Which I do not need) and high prices. Maybe one of the new Kenko pro300 AF 1.4 DGX? The Kenko TCs are made by Tamron and perform quite well in general photogra...

I have a limited experience with studio strobes, but here it goes. When I have time, I might write an extended version on my web site. One of the first things I noticed is that manufacturers use two ways to rate the power of a studio strobe: Ws (Watt second) and "effective Ws". The nominal measureme...

This is an RMS microscope objective with variable aperture (NA 0.7 to 1.0) and non-retractable nose. What does HI mean? Is this an immersion objective?

I hope I did not confuse the situation when I said "Seems like it would only make sense with a 1" or smaller sensor". I was referring to the odd nomenclature manufacturers use for sensor size. The imaging area of a 1" sensor actually measures about 12.8mm x 9.6 mm with a diagonal of 16mm. As such, ...

16 (mm) is the diameter of the field stop, which normally determines the field of view of the eyepiece before magnification (e.g. a 10x 21 eyepiece has a field stop of 21 mm and an apparent field of view through the eyepiece of 210 mm, as seen from a standard distance of 250 mm). In this case, since...