MArk, Matthew, Thank you both for your interest and help. I am pleased you also found this gadget intriguing.
First, I must correct a typo for future generations who will look into this case: >I've found this tubular thing (9 - 22 cm in length, It is 9-11 cm in length. Matthew, your suggestion looks very promising I should say. The gadget is conceptually similar. It is just smaller. Also the ends of the tube seems to be designed for human eyes (consideration of viewing point). The image is just a band of rainbow. It may well be an "off axis guider" for another system. Perhaps, a microscope! I will look into this and if I find anything to satisfy our curiosity, I'll share it. Thanks again, Bulent --------------------------------------------------------------------- http://patoloji.gen.tr http://celasun.wordpress.com/ http://www.flickr.com/photos/bc_the_path/ http://photo.net/photodb/user?user_id=2226822 http://www.pentaxphotogallery.com/artists/bulentcelasun Matthew Hunt <m...@pobox.com>, 7 Mar 2019 Per, 23:30 tarihinde şunu yazdı: > > The tiny prism makes me think of an off-axis guider for a telescope (the > prism functions as a mirror, diverting some of the light near the edge of > the field-of-view to an eyepiece or guide camera, while most of the light > goes to the main camera). > > See: > http://www.atscope.com.au/astrophoto.html > Specifically, the section "Photographing Galaxies, Nebulae, Globular > Clusters etc." > > On Thu, Mar 7, 2019 at 1:55 PM Bulent Celasun <bulent.cela...@gmail.com> > wrote: > > > I've found this tubular thing (9 - 22 cm in length, about 2 cm in > > diameter) in a thrift store. > > > > There is a single lens in each end. > > > > It has moveable parts like a mirror that rotates 360 degrees around > > the tube. During part of this travel it faces an oval hole on tube's > > wall where one can see a tiny prism inside which can intersect the > > tubular axis by moving a lever from outside. > > > > Directing the gadget toward a light source and looking at from the > > less populated end of the "tube" I see a typical rainbow. (Light > > travelling from one end to the other crossing the prism inside). > > > > Moving the lever properly while light reflecting from the mirror > > enters inside (and is reflected to cross the prism) makes two adjacent > > rainbows visible at the far end of the tube. > > > > Oh well! I am not sure if I was able to describe it... > > > > Anyway, I ask just out of curiosty. > > Has anyone ever seen something like this? > > > > https://www.flickr.com/photos/bc_the_path/sets/72157707409395914 > > > > Bulent > > --------------------------------------------------------------------- > > http://patoloji.gen.tr > > http://celasun.wordpress.com/ > > http://www.flickr.com/photos/bc_the_path/ > > http://photo.net/photodb/user?user_id=2226822 > > http://www.pentaxphotogallery.com/artists/bulentcelasun > > > > -- > > PDML Pentax-Discuss Mail List > > PDML@pdml.net > > http://pdml.net/mailman/listinfo/pdml_pdml.net > > to UNSUBSCRIBE from the PDML, please visit the link directly above and > > follow the directions. > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
