Search found 500 matches

by harisA
Wed Nov 13, 2019 11:21 am
Forum: Photography Through the Microscope
Topic: Hard disk head
Replies: 0
Views: 457

Hard disk head

Long time since my last photo here. A lot of detail was lost due to compression from 24Mb to 300KB.
Epi brightfield 5x/0.15 zeiss neofluar

Image
by harisA
Mon Oct 28, 2019 3:49 am
Forum: Photography Through the Microscope
Topic: anomoeoneis sphaerophora
Replies: 19
Views: 2899

Smokedaddy wrote:
grgh wrote:Both nice shots,but,
first shot electrifying, reminded me of old valves from radio days.
I can relate to that. 8)

Image

-JW:
Blue glow on 6l6 tubes is a sign of poor vaccum or/and voltage near maximum ratings.
by harisA
Wed Mar 06, 2019 6:39 am
Forum: Equipment Discussions
Topic: Help to identify massive lens.
Replies: 7
Views: 2672

Help to identify massive lens.

Came across this beast last Saturday.No markings on body.Front lens diameter 12cm,rear lens diameter 8.5cm ,length about 15cm ,distance from the front element to image plane (infinity focus) 19cm,weight 3.8kg. Any idea what it is? http://www.photomacrography.net/forum/userpix/1778_2_1.jpg http://www...
by harisA
Fri Jun 01, 2018 8:38 am
Forum: Equipment Discussions
Topic: Flash through a compound microscope?
Replies: 10
Views: 2655

I own the Nikon E400 which is also a CFI-60 microscope.Why are you using such a long tube between trino head and the camera? My photography setup has a much shorter tube. In order to get a proper advise please answer the following questions. Are there any additional optics inside the tubes? When you...
by harisA
Tue May 29, 2018 2:22 am
Forum: Equipment Discussions
Topic: Calculating vignette, cropping on tube lens?
Replies: 20
Views: 5376

@harisA I have both Nikon and Mitutoyo objectives and I get similar vignetting with all of them. Also @Pau I have that Nikon 10x (the one in my profile photo?) and get a vignette. If you can't cover a FF frame sensor with a mitutoyo objective and your 180mm tube lens then the problem is definately ...
by harisA
Tue May 29, 2018 2:13 am
Forum: Equipment Discussions
Topic: Calculating vignette, cropping on tube lens?
Replies: 20
Views: 5376

With the exception of Mitutoyo objectives the only way to achieve FF frame coverage is to use a tube lens with a focus distance significant higher than the objective's designation. I am curious to know what experience is the basis for that statement. I re-checked just now, and I get good full frame...
by harisA
Mon May 28, 2018 12:42 pm
Forum: Equipment Discussions
Topic: Calculating vignette, cropping on tube lens?
Replies: 20
Views: 5376

With the exception of Mitutoyo objectives the only way to achieve FF frame coverage is to use a tube lens with a focus distance significant higher than the objective's designation. Nikon objectives require 200mm tube lens and Olympus 180mm .You can start with a 300mm lens but have in mind that this ...
by harisA
Sat May 26, 2018 2:43 am
Forum: Equipment Discussions
Topic: 184mm F/.9 Industrial CRT Lens by Lenzar Optics
Replies: 23
Views: 9656

Is this having a front element with diameter of 184/0.9 =204mm?
If this is the case the lens must be really massive however this not evident from the pics here.
by harisA
Thu May 24, 2018 7:48 am
Forum: Equipment Discussions
Topic: Minolta DiMAGE Scan Elite 5400 Lens Test at 1.2x
Replies: 111
Views: 24208

Thank you for clarify this. Do you know if there are any mirrors inside the Minolta scanner optical block?
by harisA
Thu May 24, 2018 5:40 am
Forum: Equipment Discussions
Topic: Minolta DiMAGE Scan Elite 5400 Lens Test at 1.2x
Replies: 111
Views: 24208

I was able to add a few notes on the Scan Elite 5400 lens on my site, which might be of general interest: http://savazzi.net/photography/scanner_lenses.html#scanelite5400 The following is from enricco site: ''In particular, the sensor of the Scan Elite 5400 II scanner has a 53.5 mm long active area...
by harisA
Thu May 17, 2018 5:29 am
Forum: Equipment Discussions
Topic: One more scanner lens-Microtek 9800XL
Replies: 4
Views: 1402

The lens has a diameter of 34mm and a length of 38mm.It is a fixed focus lens and was found mounted at a distance of 22mm from the scanners ccd. CCD has a length of 40mm.Since A3 paper has a width of 300mm we are talking about a 0.13x magnification on sensor. I manage to mount the lens inside a M42 ...
by harisA
Thu May 17, 2018 4:45 am
Forum: Equipment Discussions
Topic: One more scanner lens-Microtek 9800XL
Replies: 4
Views: 1402

One more scanner lens-Microtek 9800XL

I couldn't resist the new ''scanner lens'' trend created by Robert O Toole.I bought the 17Kgr scanner in an open market for 5 euro. However I had to carry it with my hands for half kilometer.So in the end I can say it was a fair deal...... Microtek 9800xl is an A3 scanner with a line ccd of 21000pix...
by harisA
Mon May 14, 2018 1:26 pm
Forum: Equipment Discussions
Topic: Nikon D850 Electronic vs Mechanical Shutter Test at 20x
Replies: 9
Views: 1969

If I understand correctly you are using shutter speed of 10sec with the combination mechanical shutter/no flash. Are you using a nd filter to block the light?If yes which one?.Also I think with such a low shutter speed (10s) you will avoid vibrations with any camera with a mechanical shutter.
by harisA
Wed May 09, 2018 1:54 pm
Forum: Equipment Discussions
Topic: Pixel size and image resolution
Replies: 52
Views: 6127

In this case the feature size on subject is smaller than the sensor can resolve, given the fixed magnification (it was fixed, correct?). This can easily be calculated, assuming all sensors resolve in a theoretically predictable manner. Of course some sensors will resolve smaller details than other ...
by harisA
Wed May 09, 2018 8:38 am
Forum: Equipment Discussions
Topic: Pixel size and image resolution
Replies: 52
Views: 6127

Pixel size and image resolution

There are a lot of threads in this forum regarding various equipment.Microscope objectives,tube lenses,macro lenses are thoroughly tested and this is good ,because knowledge is shared. However there is a lack of testing regarding image sensors despite the fact it is the weakest chain link.(it is wel...