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Showing results for tags 'medium format'.
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I bought another 300 mm lens as an alternative to the Canon 300 mm L lens I already have. The main reason is to achive a lower vignetting. I have very positive experience from an earlier medium format lens. This is the Pentax 645 300 mm ED f/4 lens with good reputation. If I get some positive results from this lens I maybe replace my Canon 300 mm lens with this one. Here is some photos and data about the lens: http://www.astrofriend.eu/astronomy/projects/project-pentax645-300ed/01-pentax645-300ed.html I bought it mostly because I'm curious about it and want to test it. It's more than ten years older than the Canon lens. Lars
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Greetings SGL members. It has been some time since I have posted any new film images. It is true that I have been having a fling with a mistress named DSLR, but my heart is in these images done in the way I learned thirty years ago. My last imaging session according to my Log book was October 11, 2012. I had just finished a roll of Superia that night and I almost never returned. I began experimenting with digital. It was fun and productive but I missed my old film images. I was delayed further about one year ago. Without warning I suffered a severe heart attack. It was quite the scene. I was a goner for sure if not for the help of some cracker jack EMT's that kept CPR going. I was gone for over 15 minutes. The ER got me back and the chopper flight to an emergency heart catheterization lab placed a stent and after several months of rehab I am back and good as new! I had one great session in late June. For several back-to-back nights the weather cooperated enough to image with a new lens and I wanted to share with you all. The images below are taken with the Pentax 67 and the 400mm F/4 SMC Takumar lens. I used apertures of f/4.8 or f/5.6 for 40-50 minute exposures on Fuji Neopan Acros 100 black and white negative film. You can read about my project plan and inspiration here: http://nightflyphotography.blogspot.com/2014/07/recapturing-ee-barnards-legac... You can view the images and read about them here: http://nightflyphotography.blogspot.com/2014/07/selected-regions-of-milky-way... Here is a legend to the several images taken in June. Pictures at Eleven by Nightfly Photographic, on Flickr Below are some of the results. These are preliminary images that were scanned rather hastily, but these results look promising. I need to go back and remaster each image, something that will take me awhile. A good task for winter when I am shut indoors. Messier 24 Region by Nightfly Photographic, on Flickr Region of Dark Lanes in Ophiuchus by Nightfly Photographic, on Flickr The Southern Scutum Star Cloud by Nightfly Photographic, on Flickr The Dark Nebulae Around Theta Ophiuchi by Nightfly Photographic, on Flickr Apologies for the smaller sized image here: The Great Star Cloud in Scutum by Nightfly Photographic, on Flickr Messier 22 Region in Sagittarius by Nightfly Photographic, on Flickr The Great Sagittarius Star Cloud by Nightfly Photographic, on Flickr Thanks for looking. I hope you enjoyed them. Jim -
Long time ago I bought a Pentax medium format lens. It's a Pentax SMC 67 165 mm f/2.8. The reason I bought this was to have as low vignetting as possible. Later I bought the Sigma APO 150 mm f/2,8. Very good but a bit high vignetting. After this the Pentax have collected a lot of dust. But why not give it one more chance? Here you can see some graphs over the vignetting where I compare the Sigma with the Pentax: http://www.astrofriend.eu/astronomy/projects/project-sigma-pentax-vignetting/project-sigma-vs-pentax.html Later I shall also do some test how sharp it is, now with a live view camera it's much easier to get it in perfect focus, I think I failed with this earlier. Any other out there using medium format lenses (for astro)? /Lars
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