Whatever you do - don't sell that lens

Minolta MC Tele Rokkor-PF 100 f2.5 and Kodak Ultra Max 400 film.

Every photographer has a lens or two in their roster that they won't trade. Those kind of lenses will be used to take the "last roll". Rokkorlab is no exception.

Image above is a recent film photo taken in February using Minolta MC Tele Rokkor-PF 100 f2.5 lens. This famous tele can be considered "aesthetically perfect". Images taken with it stand out as exceptionally clear and vivid. Sometimes when used on digital there may be "foreground object multiplication", which is caused by too few iris blades. On film the lens is one of the "perfect ones".

MC Tele Rokkor-PF 100 f2.5 has become fairly rare on auction site even if pricing does not yet reflect it. Reverse engineering of the optical formula would be required to be able to manufacture more of the 100 mm tele perfection - possibly with increased number of iris blades.

Rokkorlab works constantly on the best but obsolete optics to come up with solutions to resurrect brilliant image quality from the bygone era.

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Proceeding with film bench

One smaller product development currently tries to build a work bench for film copying and scanning with a camera and lens. In the image film copying and scanning tools can be seen. Lumix GF1 camera body will be used as light table. On the right a film microscope was devised using Rodenstock lens and Vivitar telescopic adapter.

What is missing currently is a custom built stand that turns the macro bellows and focus rail setup into vertical position hovering over the light source. On top of the GF1 display a ground glass will be placed. Film - either negative or positive - is placed on the ground glass for copying or scanning.

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Capture fun in the sun and snow

Extremely bright snowy scenes of the maturing winter are interesting but also difficult to photograph - contrast between brightly lit areas and shadows can be steep. Another question is what hue range to use for the snow. If the snow is not in the brightest exposure value, it easily becomes gray.

With color negative film gray snow is never a problem. It is possible to add some saturation to shadows and create colorful winter scenes. Kodak Ultra Max 400 film captured the image on the left.

Taking lens was Minolta MC Tele Rokkor-PF 100 f2.5 stopped down to f11. ND4 filter was also employed.

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Developing in February

First 3D printed parts and products will be completed. Work continues to refurbish Emco Unimat 3 lathes and accessories for metal work.

What is Rokkorlab

Rokkorlab is a not-for-profit 3rd sector association for development of photographic and other fine mechanical products and services. A new product or service is first invented and proposed. If there was demand for the product, resources could be pooled to develop prototypes. Finished products could be manufactured on demand and made available to contributing developers. Suitable products could later become available for buyers.

3rd sector simply means independent - the association is not tied to a commercial or other entity. Ideas flow freely. Several technology platforms are in development for prototyping

Are you a developer?

Developers often struggle to find the necessary support to create entirely new or improved products. First there must exist an idea. But what then? How to begin to push the idea into a real useful item? This is where a developers' association could enter the picture.

If interested in products or product development, please use contact information

Proposed products

Entirely new film camera system for the enthusiast

Partial list of products or services in development

3D design and CAD using Impulse Imagine3D software for 3D printed parts and products
Metal shop for camera and lens part manufacturing
New adapter with fixed iris for Pentax-110 miniature film lenses
Film workbench with film microscope for analog film copying and inverting negative film to positive for scanning
Repair and restoration of Minolta MD zoom lenses
Rokkors in the hands of a modern photographer - the photo book

Partial list of completed products

Adapter for using Minolta MD 35-70 f3.5 Macro zoom lens with Canon EOS cameras
Restoration of Minolta MC W.Rokkor-SI 28 f2.5 wide angle lens
Manual aperture modification for Vivitar 35ES (Revue 400 SE) pocket rangefinder enabling battery free operation
Fixing Tokina RMC 28 f2.8 stuck iris

Recent articles

 Minolta MC Tele Rokkor-PF 100 f2.5 - Lens technical data and sample film image..

  What others shoot - Primotar (flickr)..

  Best from previous seasons (summer 2016) - Spontaneous photography with Vivitar 35ES pocket rangefinder (film)..

  Best from previous seasons (summer 2016) - Action photography with a manual tele lens (film)..

  Best from last summer (2017) - Easy to adapt Tokina RMC 28 f2.8 wide angle lens (digital)..

  Best from last summer (2017) - Serviced Tokina RMC 28 f2.8 on Canon 5D full frame (digital)..

  Best from last summer (2017) - Bad sky day with Vivitar 35ES pocket rangefinder (film)..

  Best from previous seasons (summer 2013) - Self portrait with segmented scanning (film)..

  Best from previous seasons (summer 2016) - Ektar 100 color film and Minolta wide angle lens (film)..

  Best from previous seasons (summer 2016) - Canon EOS adapted Minolta 28 mm wide angle (film)..

  Best from previous seasons (winter 2015-2016) - Filmed and scanned with the same lens (film)..

  Best from last summer (2017) - Almost normal summer sky (film)..

  Best from previous seasons (winter 2016-2017) - Minolta MC W.Rokkor-SI 28 f2.5 (film)..

  Best from this last summer (2017) - Konica Hexanon AR 40 f1.8 pancake lens (film)..

  Best from previous seasons (summer 2014) - EOS adapted MD 35-70 f3.5 Macro lens in 5k high resolution film scan (film)..

  Best from previous seasons (summer 2016) - Trombi (small tornado) (film)..

  Best from previous seasons (summer 2016) - Carl Zeiss Jena MC Flektogon 35 f2.4 (film)..

  Best from previous seasons (summer 2016) - Rollei Digibase 200 color negative (film)..

  Best from previous seasons (summer 2016) - Pentax-110 lenses (digital)..

  Best from previous seasons (summer 2016) - Agfa CT Precisa 100 slide film and MD 35-70 f3.5 Macro (film)..

  Best from last summer (2017) - Konica TC-X body (film)..

  Rust removal in low light with Canon 5D and Minolta Rokkor-PF 50 f2..

  Kodak 50D - Photography with motion pictures film stock..

  Battery free summer photography for 2017 season..

  Boating with Hexanon pancake lens (film)..

 Konica Hexanon AR 2x teleconverter - Lens technical data and sample film image..

  Testing Tokina RMC 28 mm lens (film).. (updated)

  Near rangefinder quality with Konica Hexanon AR 40 f1.8 pancake (film)..

  Sunrise with Tokina RMC wide angle (film)..

  Ektar sky (film)..

  Service for common Tokina RMC iris problem..

  Hexanon AR mount lenses - comparing sharpness and contrast..

Archived articles

Archive  Previous articles.. (updated)