<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <head> <link rel="apple-touch-icon" sizes="57x57" href="/apple-touch-icon-57x57.png"> <link rel="apple-touch-icon" sizes="60x60" href="/apple-touch-icon-60x60.png"> <link rel="icon" type="image/png" href="/favicon-32x32.png" sizes="32x32"> <link rel="icon" type="image/png" href="/favicon-16x16.png" sizes="16x16"> <link rel="manifest" href="/manifest.json"> <link rel="mask-icon" href="/safari-pinned-tab.svg" color="#5bbad5"> <meta name="msapplication-TileColor" content="#da532c"> <meta name="theme-color" content="#ffffff"> <title>Rokkorlab</title> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <meta name="description" content="Minolta Rokkor lens services"> <meta name="keywords" content="minolta, rokkor, md, lens, zoom, tele, telephoto, lens conversion, film, photography, scanning, adapter"> <style type="text/css"> a, a:link, a:visited { text-decoration: none; color: #88D9F3; } a:hover { font-weight: bold; text-decoration: none; color: #77C8E2; } a img, img { border: 0; } body { font: 11px Verdana; color: #EEE; background: #bbbbbb; margin: 0px 0px 0px 0px; padding: 0; } h1 { font: 16px Verdana; margin-top: 5px; color: #FFF; } h2 { font: 13px Verdana; margin-top: 10px; margin-bottom: 10px; color: #FFF; } p { margin: 5px 0px 8px 0px; padding: 0; } ul { list-style-type: square; margin: 0px 0px 0px 0px; padding: 0; } li { margin: 0px 0px 5px 0px; padding: 0; } #footer { width: 990px; margin: 15px auto; text-align: center; color: #333; font-size: 10px; } #header { height: 5px; background: #797979; } #main { width: 970px; margin: 0px 0px 0px 15px; } #wrapper { width: 990px; margin: 10px auto; line-height: 15px; padding:0; } .table1 { table-layout: fixed; background: #797979; width: 960px; text-align: left; } .table2 { table-layout: fixed; background: #797979; margin: 5px 0px 0px 0px; width: 930px; } .table3 { table-layout: fixed; background: #797979; width: 930px; text-align: left; } .table4 { table-layout: fixed; background: #797979; margin: 0px 0px 0px 0px; width: 930px; } </style> </head> <body> <div id="header"></div> <div id="wrapper"> <div id="main"> <p><img src="1823img33pieni.jpg"></p> <p><table class="table1"><tr> <td style="color:#88D9F3;"><p><img src="logo04.jpg"></p> <table class="table3"><tr> <td style="color:#EEE; padding-right:25px; padding-left:20px"><p><h1>Portra 800 turns night into a day</h1></p> <p><h2>Film image taken with Minolta MC Rokkor-PF 58 f1.4.</h2></p> <p>Classic 58 mm Minolta legacy lens and Kodak Portra 800 captured this early summer morning in June.</p> <p>This lens and film combination offers good opportunities for photography in low light. The 58 mm Rokkor is fairly sharp already at f3.5 whereas some other lenses need to be stopped down to f5.6 for comparable sharpness. Together with ISO 800 film there are more than three f-stops more exposure available for hand held photography. This means that photography does not have to end at sunset but continues all the way to sunrise.</p> <p>If there is one word to describe the 58 mm f1.4 Rokkor it would be 'awesome'. Lenses are still available on auction site for relatively low prices, although several copies had to be obtained to have one mostly working sample. Common issues are stiff focus ring and slow and oily aperture blades. Both issues can be solved in many cases.</p> <p>For summer 2018 photography season - well underway by now - the theme is photography in low light with Kodak Portra 800 and 58 mm Rokkor-PF.</p> <p><a href="1823img33.jpg"><img src="nuolifront.png">&nbsp;2.5k large image.. </a></p> </td> <table class="table2"><tr> <td style="padding-right:25px; padding-left:16px"><p><img src="IMG7390index.jpg"></p></td> <td style="color:#EEE; padding-right:25px; padding-left:45px"><p><strong>Harvesting solar energy</strong></p> <p>More and more solar panels are harvesting the power of sun and converting it into electricity. During the summer Rokkorlab computers are mostly powered with this small cluster of eight light weight solar panels connected in parallel.</p> <p>Rather than just buying something from a shop the solar panel was turned into a small technology project to learn how a complete system works and what it could do when put together from individual components.</p> <p>Eight panels could charge a car battery during the day. Two amps were generated on average - three with precise positioning.</p> <p><img src="nuolifront.png"><a href="IMG7390.jpg">&nbsp;2k large image.. </a></p> </td> <table class="table4"><tr> <td style="padding-right:25px; padding-left:16px"><p><img src="IMG7319index.jpg"></p></td> <td style="color:#EEE; padding-right:25px; padding-left:45px"><p><strong>Shutter and lens mount for Rokkorcam</strong></p> <p>Altissa Altix camera appears to be the perfect platform for prototyping new Rokkorcam film camera. In the image Tempor leaf shutter can be seen. Mechanical shutter needs no batteries and is positioned correctly in the light path so that Rokkor lenses can be rather easily adapted and tested.</p> <p>Rather than adapting lens the Altix camera lens mount will be replaced with M42 thread mount. The result depends on the shutter diameter - if it allowed wider than SLR images go through to 45 mm wide film frame.</p> <p>Can you already see a Rokkor on top of the camera like I do?</p> <p><img src="nuolifront.png"><a href="IMG7319.jpg">&nbsp;2k large image.. </a></p> </td> <p></p></td> <table class="table4"><tr> <td style="color:#EEE; padding-right:10px; padding-left:18px"> <p><h2>Developing in August</h2></p> <p>Summer 2018 photography season continues for three more weeks. This summer's theme is photography in low light with Portra 400 and 800 films. Website updates will be slow during active season.</p> <p><strong>Products and services in development (in order of priority)</strong></p> <p>Rokkorcam - a new film camera system taking 45 mm wide 16:9 aspect ratio images on <a href="/cgi-bin/csvsearch.pl?&search=product0008">standard 135 film</a><br> Optical film scanning <a href="../IMG7206.jpg">workbench</a><br> Pentax-110 m4/3 adapter with <a href="/cgi-bin/csvsearch.pl?&search=photo0042">fixed iris</a><br> M42 thread mount conversion for <a href="../IMG7195.jpg">Minolta MC Rokkor-PF 58 f1.4</a><br> M42 thread mount and Konica AR mount conversion for several Minolta Rokkor lenses<br> Service and restoration for <a href="../P1090732.jpg">Minolta MD zoom lenses</a></p> <p><strong>Completed products</strong></p> <p>Minolta-Konica conversion for MD 35-70 f3.5 <a href="../IMG7223.jpg">Macro zoom</a><br> Adapter for using Minolta MD 35-70 f3.5 Macro zoom lens with <a href="/cgi-bin/csvsearch.pl?&search=product0004">Canon EOS cameras</a><br> Restoration of Minolta MC W.Rokkor-SI 28 f2.5 <a href="../DPP65722.jpg">wide angle lens</a><br> Manual aperture modification for Vivitar 35ES (Revue 400 SE) pocket rangefinder enabling <a href="/cgi-bin/csvsearch.pl?&search=support0005">battery free operation</a><br> Fixing Tokina RMC 28 f2.8 <a href="/cgi-bin/csvsearch.pl?&search=support0006">stuck iris</a></p> <p><h2>Recent articles</h2></p> <p><img src="photo.gif">&nbsp;&nbsp;<a href="/cgi-bin/csvsearch.pl?&search=photo0065">Best from previous seasons (winter 2013-2014) - MC W.Rokkor-HH 35 f1.8 scanned with 5D (film).. </a></p> <p><img src="scanner.gif"><img src="placeholder.gif"><img src="placeholder.gif">&nbsp;<a href="/cgi-bin/csvsearch.pl?&search=digitize0014">Making slides from color negative.. </a></p> <p><img src="photo.gif">&nbsp;&nbsp;<a href="/cgi-bin/csvsearch.pl?&search=photo0064">Adapting 5D (digital).. </a></p> <p><img src="photo.gif">&nbsp;&nbsp;<a href="/cgi-bin/csvsearch.pl?&search=photo0063">Best from last season (summer 2017) - Red dawn with Hexanon AR 40 f1.8 (film).. </a></p> <p><img src="photo.gif">&nbsp;&nbsp;<a href="/cgi-bin/csvsearch.pl?&search=photo0060">Lens test - Pentax Super-Multi-Coated Takumar 28 f3.5 versus Minolta MC W.Rokkor-SI 28 f2.5 (film).. </a></p> <p><img src="photo.gif">&nbsp;&nbsp;<a href="/cgi-bin/csvsearch.pl?&search=photo0062">Best from this season (winter 2017-2018) - Minolta-Konica sample image (film).. </a></p> <p><img src="photo.gif">&nbsp;&nbsp;<a href="/cgi-bin/csvsearch.pl?&search=photo0061">Best from this season (winter 2017-2018) - Hibernating boat with MC Tele Rokkor-PF 100 f2.5 (film).. </a></p> <p><b>Support</b><img src="placeholder.gif">&nbsp;<a href="/cgi-bin/csvsearch.pl?&search=support0007">Film color grading tutorial - adjust shadow saturation..</a></p> <p><img src="rokkor.gif"><img src="placeholder.gif">&nbsp;<a href="/cgi-bin/csvsearch.pl?tp=tp19&search=rokkor0004">Minolta MC Tele Rokkor-PF 100 f2.5 - Lens technical data and sample film image..</a></p> <p><img src="article.gif">&nbsp;&nbsp;<a href="/cgi-bin/csvsearch.pl?&search=article0011">What others shoot - Primotar (flickr).. </a></p> <p><img src="photo.gif">&nbsp;&nbsp;<a href="/cgi-bin/csvsearch.pl?&search=photo0040">Best from last season (summer 2017) - Bird in sunrise with Hexanon AR 40 f1.8 (film).. </a></p> <p><img src="photo.gif">&nbsp;&nbsp;<a href="/cgi-bin/csvsearch.pl?&search=photo0057">Best from last season (summer 2017) - Easy to adapt Tokina RMC 28 f2.8 wide angle lens (digital).. </a></p> <p><img src="photo.gif">&nbsp;&nbsp;<a href="/cgi-bin/csvsearch.pl?&search=photo0056">Best from last season (summer 2017) - Serviced Tokina RMC 28 f2.8 on Canon 5D full frame (digital).. </a></p> <p><img src="photo.gif">&nbsp;&nbsp;<a href="/cgi-bin/csvsearch.pl?&search=photo0054">Best from last season (summer 2017) - Bad sky day with Vivitar 35ES pocket rangefinder (film).. </a></p> <p><img src="photo.gif">&nbsp;&nbsp;<a href="/cgi-bin/csvsearch.pl?&search=photo0059">Best from previous seasons (summer 2016) - Spontaneous photography with Vivitar 35ES pocket rangefinder (film).. </a></p> <p><img src="photo.gif">&nbsp;&nbsp;<a href="/cgi-bin/csvsearch.pl?&search=photo0058">Best from previous seasons (summer 2016) - Action photography with a manual tele lens (film).. </a></p> <p><strong>What is Rokkorlab</strong></p> <p>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 become available for buyers.</p> <p>3rd sector means independent - the association is not tied to a commercial or other entity. Ideas flow freely. Several technology platforms are in development for <a href="/cgi-bin/csvsearch.pl?&search=article0010">prototyping and manufacturing</a></p> <p><h2>Are you a developer</h2></p> <p>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.</p> <p>If interested in products or product development, please use contact <a href="/cgi-bin/csvsearch.pl?&search=support0001">information</a></p> </tr></td> </tr></td></table></table></table></p> </div> <div style="clear: both;"></div> </div> <div id="footer"> Copyright 2013 - 2018 rokkorlab.net </div> </body> </html>