Enlarging Lens Comparisons - News
The new Alcon Division, which now also includes the CIBA Vision contact lens and lens care business and select Novartis ophthalmic medicines, delivered robust growth in the second quarter. With the new organizational structure implemented in the second
Even prior to Johnson's revelations, American purity reformers had viewed the Spanish-Cuban-American War and the acquisition of Caribbean and Pacific colonies through the lens of European empire, prophesying the speedy arrival of “regulated vice” to
Big picture considerations – lenses and software comparisons « Mel ...
I recently sold a couple of large prints to a friend and went through a couple of days of testing how to get the best appearance from big enlargements. Along with that I’ve been reading about sharpness differences in lenses and wondering about the impact on enlargements. Being a nut for sharpness in my landscapes I decided to do a little testing on my gear and see what differences I could find along with techniques to maximize sharpness.
You may never need to worry about this issue but I’m the photographer who walks up and puts my nose right at a big photograph just to see how sharp it is. For normal people, the “correct” viewing distance is around 2 times the diagonal dimension of the picture (where infinite sharpness is less of an issue). Your brain is pretty good at dealing with this – watch people at an exhibition moving back and forth in front of a painting or large photo and you’ll discover most of them land in the same spot, which is around 2 times the diagonal of the image they are examining. Has to do with angle of view of our eyes and how much we jump around in an image to take it all in.
Anyway, to compare lens sharpness I have two lenses with a 50mm focal length – one is a fixed macro at 50mm and the other is a zoom whose range includes 50mm. In order to learn what differences might show up in processing I have two software tools for enlarging – Photoshop CS5 (bicubic) and Perfect Resize 7 (formerly known as Genuine Fractals). Software packages make enlargements by literally creating new pixels in your image using sophisticated algorithms that try to made the new pixels blend in with the old ones. I can’t begin to explain how this works – it’s just magic to me.
My test is a simple one: photograph a straight edge with the two lenses at a fixed distance and then enlarge the image with the two software tools and compare the results.
As a summary I found the two lenses have little difference in sharpness in this test – the differences were greater between the software tools than the lenses.
I set up my camera at 64 inches from my target (just a random choice), a razor blade in front of a piece of white foamboard. Lighting was from above, a 65 watt flood light (hence the really warm color in the images). Camera was on a tripod, manual focus using LiveView on the back of the camera and a 5 second delay between the mirror lock-up and the shutter release.
Enlarging Lens Comparisons - Bookshelf
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Once the film is dry, it's time to compare the two strips. ... the analyzer's probe in the middle of the baseboard, directly under your enlarging lens. ...British journal of photography
ZZZ^mtnVZ Covers 5 x 5 C39; WraV HR Lustrar 7;; Enlarger lens . .... but also to anyone considering owning a top system 35mm SLR, as a basis for comparison. ...American photography
For instance, one of the lenses I use for enlarging is a Series II Collinear ... is so vastly superior to one on bromide that there is really no comparison. ...Applied photographic optics, lenses and optical systems for photography, film, video, electronic and digital imaging
Figure 38.4 Enlarger lens design The diagrams show typical optical ... A wide- angle enlarging lens for small and medium formats allows greater magnification ...Focal encyclopedia of photography, digital imaging, theory and applications, history, and science
As long as the enlarger lens plane and either the film plane or the easel plane can ... By comparison, tungsten light has a relatively low blue output but ...Information Today Directory
150mm f/5.6 Componon-S Enlarging Lens Prices | ZDNet
Price comparisons of 150mm f/5.6 Componon-S Enlarging Lens at ZDNet Reviews. Each review comes complete with video or image galleries, quick spec sheets and price ...
90mm f/4.5 APO-Componon HM Enlarging Lens Prices | ZDNet
Price comparisons of 90mm f/4.5 APO-Componon HM Enlarging Lens at ZDNet Reviews. Each review comes complete with video or image galleries, quick spec sheets and ...
Any 40mm enlarger lens comparisons?
Hi, I am in the market for a shorter focal length lens (than 50mm) for 35mm work. Does anyone know how the 40mm lens Nikkor, Rodenstock, Schneider etc.
Compare prices for Printmaker 67 Dichro (Color) Enlarger with ...
CheapUncle allows you to compare prices to find the best deal on Printmaker 67 Dichro (Color) Enlarger with Lens Kit by Beseler. By comparing prices and combining ...
Innovision Optics - Creative Ways of Imaging
Innovision Optics provides advanced lens systems and motion control for the film and television industries.