Search found 598 matches

by dmillard
Mon Oct 08, 2018 2:08 pm
Forum: Equipment Discussions
Topic: Stacked Lens vs APO objectives at 4x with Surprising Results
Replies: 88
Views: 8966

Well, for anybody that missed out on the Makro-Symmar, I will be posting one for sale very soon! :) As Robert previously said, usedparts-semifa is one of the best. I ordered the lens Thursday, and received it this morning before 9:00 am, extremely well-packed. I then quickly tested it against the Ma...
by dmillard
Sun Oct 07, 2018 6:47 pm
Forum: Equipment Discussions
Topic: Stacked Lens vs APO objectives at 4x with Surprising Results
Replies: 88
Views: 8966

In 2012 I posted that I have a 35mm f/2.0 Mid 1977 (looks much like the one above) 28mm f/2.0 Approx 1943 (looks older!) That's interesting Chris. I just looked in Kingslake's History of the Photographic Lens , and according to him, the Schneider Xenon is an unsymmetrical six element double-Gauss l...
by dmillard
Sun Oct 07, 2018 3:20 pm
Forum: Equipment Discussions
Topic: Stacked Lens vs APO objectives at 4x with Surprising Results
Replies: 88
Views: 8966

Thanks again for sharing the performance of this lens combo! From Schneider's data at https://www.schneideroptics.com/info/age_of_lenses/ , your particular 28mm & 35mm Xenons were produced in 1995 and 1996 respectively, but Schneider doesn't provide information about how long and how many of either ...
by dmillard
Sun Oct 07, 2018 8:18 am
Forum: Equipment Discussions
Topic: Stacked Lens vs APO objectives at 4x with Surprising Results
Replies: 88
Views: 8966

typestar wrote:
This community is very fast: ;-)
The challenge now is locating either of the Xenons! :wink:
by dmillard
Thu Oct 04, 2018 8:53 pm
Forum: Equipment Discussions
Topic: Stacked Lens vs APO objectives at 4x with Surprising Results
Replies: 88
Views: 8966

Thank you for another noteworthy test! What was the working distance with the stacked pair?
by dmillard
Thu Oct 04, 2018 8:20 pm
Forum: Equipment Discussions
Topic: Lee diffusers?
Replies: 14
Views: 1607

I use a variety of Lee filters, primarily as cylinders on my Mitutoyo and Olympus objectives. I often combine them with an inner layer of 214 Tough Spun to further cut interior reflections, or selectively mask them with black cardstock. Like Harald, I have found them to be very color neutral, but I ...
by dmillard
Mon Oct 01, 2018 11:03 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Foraminifera fossils
Replies: 5
Views: 1450

These are very nice images Leo96! And I also appreciated Enrico's erudite clarification of the subject material.
by dmillard
Tue Sep 25, 2018 1:35 pm
Forum: Equipment Discussions
Topic: 5x Magnification Ideas and Suggestions
Replies: 27
Views: 3405

A quick test of the 7.5X with an Apo-Symmar 135mm f/5.6 shows that it easily covers the full frame of a Sony A7Rii at 4.91X. I think the darkened corners seen here may result from mechanical vignetting somewhere else in my system (the lens aperture, PB-6 bellows, or the Nikon-Sony adapter), rather t...
by dmillard
Sat Sep 22, 2018 9:28 pm
Forum: Equipment Discussions
Topic: 5x Magnification Ideas and Suggestions
Replies: 27
Views: 3405

Re: 5x Magnification Ideas and Suggestions

RobertOToole wrote:Any ideas or suggestions for a 5x test?
Possibly a Nikon CFI Plan Apo 4/0.20 or an Olympus UPlanApo 4/0.16 pushed to approximately 5x with tube lenses of the appropriate focal lengths (250mm and 225mm, respectively).
by dmillard
Sat Sep 01, 2018 5:23 am
Forum: Equipment Discussions
Topic: (LSA || DCR150 || ITL200) ? FF : CROP
Replies: 58
Views: 5503

Hi David, Many thanks for the test! Can you change the power of the Vivitar 283? If yes, which value have you used? I’m asking for that because your diffuser of Leelux 400 absorbs a lot of light. BTW, what is a paper Waterhouse stop ? BR, ADi The Leelux 400 absorbs a lot, plus I used an inner cylin...
by dmillard
Sat Sep 01, 2018 5:07 am
Forum: Equipment Discussions
Topic: (LSA || DCR150 || ITL200) ? FF : CROP
Replies: 58
Views: 5503

Adalbert wrote:Hi Lou,
Very nice moth scales!
I agree - excellent illustrations of the capabilities of the lens and the camera!
by dmillard
Fri Aug 31, 2018 8:39 pm
Forum: Equipment Discussions
Topic: (LSA || DCR150 || ITL200) ? FF : CROP
Replies: 58
Views: 5503

Hello everybody, Has anybody tested the tube-lenses 360mm / 300mm / 240mm ? Hello Adalbert, I had hoped to do show you a comparison between some large format lenses in those focal lengths, but unfortunately found I had misplaced a few important components for my Aristophot stand, which I have negle...
by dmillard
Wed Aug 29, 2018 5:47 am
Forum: Equipment Discussions
Topic: (LSA || DCR150 || ITL200) ? FF : CROP
Replies: 58
Views: 5503

What about this one (OK, is expensive but APO) https://www.ebay.de/itm/Rodenstock-Apo-Ronar-9-360mm-14inch-Objektiv-lens-90170/332098746576?hash=item4d52a0b8d0:g:CnYAAOSw5cNYg1lT BR, ADi I previously found the Apo-Ronar 240mm f/9 to be very free of chromatic aberration, but my copy was one that may...
by dmillard
Tue Aug 28, 2018 10:51 am
Forum: Equipment Discussions
Topic: (LSA || DCR150 || ITL200) ? FF : CROP
Replies: 58
Views: 5503

I'd like to reinforce what Jorgen said about focal length vs format size. If you are happy with a given objective on a tube lens of focal length 200mm on APS, you will get exactly that same image, with same corner quality, filling the FF sensor if you use change to a tube lens of 300mm. I am using ...
by dmillard
Sat Aug 11, 2018 11:41 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Scotch Thistle
Replies: 5
Views: 1220

Really nice images!