Dr JLW

Lives in United States New England, United States
Works as a Engr
Joined on Dec 2, 2003

Dr JLW's recent activity

  • Interesting but why would you want to do this.  Packing the stuff so intricately means that it has to be repacked as carefully and I'd rather just take photos with the lenses. If I were going to ...
  • I have not done a detailed comparison but here is some information that may be useful. I have used Silkypix but mostly I use Photoshop.  I find the controls in silkypix a bit counterintuitive since ...
  • It depends on how you travel and how much time yu want to spend messing with gear.  we took two weeks traveled by ourselves and took several thousand photos which went into two books one general ...
  • I have been very happy with my  Zhongyi Mitakon Turbo (mod 1) adapter with my AiS lenses.  It restores the full field of view and makes them a stop faster. I have been very pleased with its ...
  • This may be more than you ever wanted to know. Maksutov is famous for a version of the Schmidt Cassegrain that is purely spherical surfaces.  It has to be very well made.  It was a breakthrough ...
  • Thank you for your kind words. The lack of contrast is due to the well known (among military optics types) difficulty of reducing "Stray light", or veiling glare.   Use of  a long and very black ...
  • I have the Vivitar 800 mm F/11"solid cat"  which I use with a focal reducer.  I'll write more about that on on the thread I started some time ago but here are few tips for those interested in ...
  • Assuming the OP meant for long term use, I think it makes most sense on for most lenses to get vintage pro grade fast vintage lenses in the 35mm and longer focal lengths. They are quite good and ...
  • My Komura was the first auxiliary lens I bought for my Miranda in 1964 or so.  It was quite inexpensive then, but I did buy it used . Teflon tape works well and holds up for a long time.  About a ...
  • It has been some time since I had to deal with a stiff focus mount but I always had good results removing as much grease as I could and using teflon thread tape as a lubricant on the helicoid. It ...
  • I agree that it's likely spot on the sensor but it might also be a spot on the lens, especially if you were using a wide. You can readily remove them by using the lassos tool in photoshop followed ...
  • I use an 85 and 135 for portraits of family, especially grandchildren. I like a fast lens and prefer f/2 or faster.  That really sets the focal length limit.  Longer f/2 lenses are expensive and ...
  • The Vivitar/ Perkin Elmer cats are unique to date. Usually "mirror lenses' are two mirrors and a thin glass element, esecially the cheap ones and adapted compact telescopes. They are lightweight ...
  • Sigma made a 14mm F/3.5 fduring the late 80's and eary 90's for full frame 35mm film use and it is decent.  I kept mine because I could not get $200 for it on Ebay and I see one there now for ...
  • Replied in travel camera
    Lots of good options. We have had two Panasonic ZS models.  They are small and very capable ina lot of situations.  We have been impressed with what they can do. The latest DMC ZS 100 is a ...
  • Created discussion thread My Adapted Vivitar 800 mm Solid Cat
    I first heard about these from the people at Perkin Elmer West when I was working with them on a project during the mid 1980's and wanted one since then. Turns out I met the designer then. I ...
  • Best of runder $100 makes it tough, so many things that go into it but the old Kilfitts had a great reputation and there are a few 300mm Kilftts on eBay in your price range as buy it now's. ...
  • I suggest teh widest lens you can get with the longest 35mm equivalent being 24mm.  Check the web pages of Ken ROckwell for a primer on how to use wides. An ultra wide zoom is better. A polarizer ...
  • Those may all work but defore trying those i suggest yo get a rubber squeeze bulb, turn the sensor so it faces down and use teh bulb to blow off the crud. I found this has worked for me and it is a ...
  • Thanks. I have a Meade 1000 f/10 usable as both telescope and lens.  When I got it I had access to alignment equipment and mine needed and got some fixing.
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Last review Mar 14, 2012
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