Search found 14 matches

by waltknapp
Wed Feb 24, 2010 5:05 pm
Forum: Equipment Discussions
Topic: Exposure Metering/setting
Replies: 9
Views: 2172

It's one thing to set exposure manually on a lens that the markings on the aperture ring are the actual effective aperture. I've no problem with that and I do still have a good handheld exposure meter if I need it. But quite a different thing if the lens is on a bellows and every change in bellows e...
by waltknapp
Wed Feb 24, 2010 4:57 pm
Forum: Equipment Discussions
Topic: Exposure Metering/setting
Replies: 9
Views: 2172

I don't think he got it mixed up with focus. He's one that's very insistant that photography is done with manual settings for exposure. But shoots AF. He was very clear in what he was saying. As I said, he's not a macro shooter except maybe some product photography. I do most of my high magnificatio...
by waltknapp
Wed Feb 24, 2010 3:47 pm
Forum: Equipment Discussions
Topic: Exposure Metering/setting
Replies: 9
Views: 2172

The Sony a850 and a900 both are crippled in A mode to run only with chipped lenses in that mode. Yes there is still A mode with that limitation. The Sony a700 (which pretty much copied and updated the Minolta 7D) was the last to be able to set exposure without a chipped lens. And it went out of prod...
by waltknapp
Wed Feb 24, 2010 11:34 am
Forum: Equipment Discussions
Topic: Exposure Metering/setting
Replies: 9
Views: 2172

Yes I mean aperture priority, where you set the aperture (if the equipment has the ability to set that) and the camera metering reads the light coming in and sets the shutter speed. On Sony/Minolta cameras this is marked as A on the dial. Note there is also the alternative in flash control where wit...
by waltknapp
Tue Feb 23, 2010 2:12 pm
Forum: Equipment Discussions
Topic: Exposure Metering/setting
Replies: 9
Views: 2172

Exposure Metering/setting

Recently I was told that Canon plans to phase out automatic exposure (A Mode) working with anything other than their chipped lenses. Sony has already done this, Some Nikon cameras as well. The idea being that we all can just set exposure manually for everything else. I was flat out told that everyon...
by waltknapp
Wed Sep 30, 2009 8:39 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Ants
Replies: 9
Views: 3539

Some nice angles there! :D What a strange lens! Would a ring flash get light where you need it? The 1x-3x is equipped with mounting grooves for the Minolta 1200 Macro Ringflash. And yes it lights quite well with that setup. There is also a slide copying stage that matches up with the lens. It, too,...
by waltknapp
Sat Aug 08, 2009 12:11 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Christmas tree buds, using a ruler to provide scale
Replies: 19
Views: 9221

6" Vinyl Ruler 10-Count (05145, 05150, 05146, 05142, 09242, 05160, 05220) It was a couple years ago I last ordered, but that appears to be the same as what I ordered. I also ordered one of their right angle rulers, but that's not seen much use. At the time I ordered a fair supply so it will be a lo...
by waltknapp
Thu Aug 06, 2009 8:52 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Christmas tree buds, using a ruler to provide scale
Replies: 19
Views: 9221

Re: Rulers and scale bars

Indeed, using rulers does get in the way of my photographs. There is the DOF issue, and my rulers set off horrible glare. On the business of glare and rulers the crime scene rulers are matte finish and come in several shades, at least the ones I found were like that. I keep a few of each shade in m...
by waltknapp
Mon Mar 03, 2008 8:48 pm
Forum: Macro and Close-up Archives
Topic: Wasp sting, Olympus 20/3.5 bellows lens
Replies: 19
Views: 12820

Cyclops wrote:There is some softness there but its a fabulous image none the less!
Nice one!
The Minolta RD175 is a 1.1MP 3CCD digital. Some softness was the name of the game back then.

Walt
by waltknapp
Sun Mar 02, 2008 3:06 pm
Forum: Macro and Close-up Archives
Topic: Wasp sting, Olympus 20/3.5 bellows lens
Replies: 19
Views: 12820

Walt with your experience with all of these similar macro lenses, are there any particularly stellar performers to keep an eye out for? It really depends on what you are photographing. As has been noted each of these lenses has a fairly limited range of magnification for which it's designed. So it ...
by waltknapp
Sun Mar 02, 2008 11:21 am
Forum: Macro and Close-up Archives
Topic: Wasp sting, Olympus 20/3.5 bellows lens
Replies: 19
Views: 12820

The OM 38mm bellows lens that I have has the same arrangement. RMS thread and stunning glass. There were a few versions made. The original RMS manual versions were single coated, then there was a multicoated RMS version and then the design was changed to those that Rik owns. Mine are single coated ...
by waltknapp
Sat Mar 01, 2008 3:42 pm
Forum: Macro and Close-up Archives
Topic: Wasp sting, Olympus 20/3.5 bellows lens
Replies: 19
Views: 12820

I thought this was a bit odd (no click stops) but figured it was due to the ancient design of the lens. Can I take it your is the same? My Olympus 20mm is the same, except the ring movement is smooth and will not unscrew the lens. The 38mm is more interesting as it has two rings, one is a stop ring...
by waltknapp
Fri Feb 29, 2008 11:48 pm
Forum: Macro and Close-up Archives
Topic: Wasp sting, Olympus 20/3.5 bellows lens
Replies: 19
Views: 12820

Re: Wasp sting, Olympus 20/3.5 bellows lens

Also a lot of the time my shots are soft and I think I'm suffering from some extraneous light bouncing into lens from my flash setup I have an assortment of these micro bellows lenses, including the two Olympus ones. I first ran into them in a scientific photography course over 40 years ago and hav...
by waltknapp
Fri Jan 11, 2008 11:23 pm
Forum: Equipment Discussions
Topic: How to mount a microscope objective on a bellows?
Replies: 13
Views: 6007

How to mount a microscope objective on a bellows?

For a slightly less quick and dirty method, use a body cap. Preferably black and soft plastic. Drill a hole through the center just slightly under the screw thread diameter so the threads will bite. Screw the objective into that and attach it to your bellows.