Tag: close-up

WARREN CONNECTICUT – I tried a new iPhone app today called 645 Pro. It offers “raw” files, actually tiffs, that appear to me to have a stop or more of dynamic range that the iPhone jpegs and present fewer digital artifacts. It eats battery life so I’m waiting for a new release before I press it any further. A couple of examples in a “rocks and trees” vein.

On this day last year: 798 Art District Beijing.

WARREN CONNECTICUT – I spent some time today working with my Questar telescope as a close up lens. The Questar is a Maksutov-Cassegrain design – the first of these that was available in the US commercially. It was an object of lust in the 50s and 60s – some number of years ago I found that they were still being made in New Hope PA, so I bought one. These are inherently long focal length, small aperture designs that are good for planetary observations but poor for deep space objects. It’s focal length is 1280mm. My Sony Nex-7 is fairly easily attached to it via a Rube Goldberg combination of adapters. The Sony works well on the Questar because the camera is light and its resolution matches that of the telescope fairly well. Here’s a leaf shot with the Questar. Depth of focus at this focal length is paper thin. Note the funky bokeh (the out of focus portions of the image) – this is a common issue with folded optics which have central mirrors partially blocking the exit pupil.

Here’s the Questar set up to take the above image taken with my iPhone.

Here’s the new boat, re-cropped to exclude Roger. With Roger in it it was a snapshot. Excluding Roger and moving to a square (almost) format leaves a composition of circles and angles and to my eyes makes the picture more important.

On this day last year: Outside the Forbidden City.