Search found 21 matches

by Larry45
Sat Apr 11, 2020 7:29 am
Forum: Administrator's Appreciation Gallery...Macro and Close-up Images
Topic: Snowdrops
Replies: 2
Views: 5486

Snowdrops in late sunset

I love the line from the blossom to the background light. How refreshing. I can feel the fresh air.

Survive the Coronavirus and capture more.
by Larry45
Wed Mar 11, 2020 1:00 pm
Forum: Equipment Discussions
Topic: Sharpness
Replies: 29
Views: 4983

stack artifacts

Sirs:

I just processed a stack with the other 40D. The results were the same except that the artifacts were located differently.

Regards,
Larry

PS I'll probably shoot a series with the 7D next.
by Larry45
Wed Mar 11, 2020 7:59 am
Forum: Equipment Discussions
Topic: Sharpness
Replies: 29
Views: 4983

Stack Artifacts

Sirs:

I shoot with my 40D in raw. I run it through Adobe Bridge. This is the third 40D which has done that. For that reason I don't think it is the camera body. I'll shoot you a series with the other 40D I have currently to see if the problem recurs.

Regards,
Larry
by Larry45
Tue Mar 10, 2020 10:44 am
Forum: Equipment Discussions
Topic: Sharpness
Replies: 29
Views: 4983

artifacts

Rick,
The broad color region appears around the bright spots in each image of the stack.
Can you do “one drive?” I’ll have to remember how to do it. I think I send you some info so you can get it.
Larry
by Larry45
Tue Mar 10, 2020 9:59 am
Forum: Equipment Discussions
Topic: Sharpness
Replies: 29
Views: 4983

Stack Artifacts

Dear rjlittlefield and Scarodactyl: I just had a moment to shoot this series. I shot it with the same camera body and the same lens setup, Pentax 200mm with Mitutoyo 20x mounted. As Bill Paxton in "Twister" said, “I’m not back.” I will try to upload a full resolution image if your website will accep...
by Larry45
Mon Mar 09, 2020 12:51 pm
Forum: Equipment Discussions
Topic: Sharpness
Replies: 29
Views: 4983

Color Haze and Hot Pixels

Dear rjlittlefield and Scarodactyl: I had not realized that you could not see enough detail to see the “hot Pixels.” They turned into haze of different colors. The colors are green, gray and pink. There seems to be a cubic color haze over bright points. I was going to ask about that next. I’ve had a...
by Larry45
Thu Mar 05, 2020 10:52 am
Forum: Equipment Discussions
Topic: Sharpness
Replies: 29
Views: 4983

Artifacts

Sirs:

The dots on the stack are individual spots. I'm attaching a closeup. Also, I'm going to clean lenses. We'll see what shows up or doesn't.

Regards,
Larry

Image
by Larry45
Thu Mar 05, 2020 7:56 am
Forum: Equipment Discussions
Topic: Sharpness
Replies: 29
Views: 4983

Artifacts

Sirs: As you may be able to see, I am making progress on sharpness. I have been finding artifacts when I process the stacks. Some of them are from dust on the sensor. I cleaned it before I shot this stack so I think we can write off that problem in the accompanying image. The artifacts are circled i...
by Larry45
Sat Feb 22, 2020 12:52 pm
Forum: Equipment Discussions
Topic: Camera resolution and photomacrography results.
Replies: 11
Views: 1340

Mitutoyo_M_Plan-Apo_20x_0.42_

Sirs:

What about the above? Will I see a difference using it with the 7D?

Regards,
Larry
by Larry45
Sat Feb 22, 2020 7:42 am
Forum: Equipment Discussions
Topic: Camera resolution and photomacrography results.
Replies: 11
Views: 1340

Equipment Discussions

Sirs:

The NA of the Nikon objective is 0.25. Image

Regards,
Larry
by Larry45
Fri Feb 21, 2020 8:59 am
Forum: Equipment Discussions
Topic: Camera resolution and photomacrography results.
Replies: 11
Views: 1340

10 mp vs 18mp camera for photomacrography

Sirs:

I am using a 70's Pentax 200mm lens with a Nikon 10X objective mounted. Does this tell you anything? I think it is pretty good optics but I don't know any more to tell you. I suppose I should just try using the 7D.

Regards,
Larry
by Larry45
Thu Feb 20, 2020 11:11 am
Forum: Equipment Discussions
Topic: Camera resolution and photomacrography results.
Replies: 11
Views: 1340

Camera resolution and photomacrography results.

Sirs: I have been under the impression for several months that a low megapixel count camera was necessary because the higher count on the camera does not turn out good sharp images. I read it somewhere but can’t find it now. I'm currently using a Canon 40D, 10 megapixels. I'm starting to have a litt...
by Larry45
Thu Aug 22, 2019 10:09 am
Forum: Equipment Discussions
Topic: Sharpness
Replies: 29
Views: 4983

Sharpness

Hi All, I wanted to thank you for your help resolving my sharpness issues. Those make me crazy. I am much more sane now. I wanted you to see my goal for all of that work. I found the pyrite filiform phacolite. I had to reshoot until I got the composition I wanted. It was such a relief to get it. I t...
by Larry45
Tue Jul 23, 2019 7:37 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: new mineral pictures
Replies: 5
Views: 2616

degraded sharpness

Hi Soldevilla, Your photography embodies my vision for my photomachrography. Wonderfull work. I, too, have trouble with the 20x objective. Someone suggested that I switch from constant light to flash and I got a marked improvement. I set my flash at manual 1/16. The person said that this setup produ...
by Larry45
Sun Jul 07, 2019 10:04 am
Forum: Equipment Discussions
Topic: Sharpness
Replies: 29
Views: 4983

Duplicate images

Hi, Rick I had planned to say a few words about the duplicate images. Yes, they are the same. I made this stack using Canon 580 EX flashes using 1/16 manual setting. Thing I wanted to point out was the missing image in the stack. I don't know how it happened unless it was caused by an anomaly with t...