On 6/8/04 12:51 am, "monty rakusen" <[EMAIL PROTECTED]> wrote:
> Hi List > > Firstly, may I apologise if you've seen this mail on other forums but I'm > trying to solve this problem. > > I'm wondering if there's anyone out there with a similar problem or can shed > any light on this matter . A great number of people have been in touch with > me on this subject...thanks...with conflicting answers and I'm beginning to > think that the problem might be me! > > I am using Schneider Digitar lenses with Rollei shutters on an Xact2 with an > Imacon 132C back single shot only. > > All is fine excepting one lens...120mm macro. This lens seems very fuzzy > especially at close focussing and in my opinion not very good quality. I've > done my testing and found it is focussing at the right plane and tested all > the apertures and found it only good up to f16.I use live video for > focussing. I've borrowed and tested an identical one with the same results. > I've complained to Schneider who replied as follows.. > > "Dear Mr. Rakusen, > > With digital backs you shouldn't close the iris more then 2 f-stops, > especially when going towards close up photography. Please use f-stop 8 and > you will get sharp and crispy images, anything beyond f 8 is disturbed by > diffraction. > > Kind regards > > > Ulrich Eilsberger > business unit - photo > director productmanagement" > When shooting with film it was a general rule of thumb that when the image was larger than 1to 1 we reversed the lens ,and shot with open flash ,the difference doing this was quite significant . > Now I really don't know what to do! I've spent good money on a macro lens > for shooting product (jewellery) and I'm supposed to use it at f8? > > Meanwhile I'm going to have a test of a Rodenstock. Maybe I should be using > a much longer lens like a 150mm or more? I've tried my 180mm 2.8 for the > Rollei 6008, which incidentally I am told was designed over 70 years ago and > the results were equal if not better than the 120 digitar. > > The people who mailed me to say how happy they were with the lens were > generally using it with a smaller chip and I wonder if this has anything to > do with the problem. > > > =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
