Search found 55 matches

by david_b
Fri Jan 17, 2020 9:01 pm
Forum: Camera systems and imaging
Topic: DSLR or Integrated?
Replies: 11
Views: 215

Re: DSLR or Integrated?

The EOS RP is a reasonably priced mirrorless camera which can be controlled by EOS Utilities.
by david_b
Tue Jan 14, 2020 4:06 pm
Forum: Microscopes and optics
Topic: BH-2 Focus adjustment question
Replies: 16
Views: 183

Re: BH-2 Focus adjustment question

The side that doesn’t come off will simply pull out. Planetary gears, along with small nylon gear on fine focus shaft, will be visible. Good luck There is a small amount of play in the nylon gear in the photo but none of them seem damaged. The small nylon wheel in the fine focus shaft looks ok too....
by david_b
Tue Jan 14, 2020 1:36 pm
Forum: Microscopes and optics
Topic: BH-2 Focus adjustment question
Replies: 16
Views: 183

Re: BH-2 Focus adjustment question

Sometimes shims have not been applied. Depending on the backlash between gear box and rack which you can now see, some maybe applied to take up the excess slack. There should always be a small amount of play though. The lubricant in the gear box looks like it requires replacing. It should spin quit...
by david_b
Tue Jan 14, 2020 10:59 am
Forum: Microscopes and optics
Topic: BH-2 Focus adjustment question
Replies: 16
Views: 183

Re: BH-2 Focus adjustment question

There is also a gear box in the back of the stand.... If the focus is stiff, and especially if it has noticeable hysteresis, then the grease is thickened and the scope needs service. This folder contains two PDFs that describe how to fix the focus mechanism: https://drive.google.com/open?id=1bUoWPd...
by david_b
Mon Jan 13, 2020 7:04 pm
Forum: Camera systems and imaging
Topic: DSLR or Integrated?
Replies: 11
Views: 215

Re: DSLR or Integrated?

Here's a manufacturer's table of DSLR & Mirrorless cameras suitable for microscopy - those that have Liveview via USB should be fine. Canon is a popular choice at a reasonable price point and Canon Utilities works well for camera control from a computer. https://www.lmscope.com/en/Camera_Ranking_en....
by david_b
Mon Jan 13, 2020 5:30 pm
Forum: Microscopes and optics
Topic: BH-2 Focus adjustment question
Replies: 16
Views: 183

Re: BH-2 Focus adjustment question

Thanks Carl The tension can be adjusted so the coarse focus wheel is easy to turn - but when I do that the problem with the fine focus gets noticibly worse. When I tighten the coarse focus to the max, the fine focus is better but far from perfect. The fine focus adjustment itself is not stiff - the ...
by david_b
Mon Jan 13, 2020 2:02 pm
Forum: Microscopes and optics
Topic: BH-2 Focus adjustment question
Replies: 16
Views: 183

Re: BH-2 Focus adjustment question

Thank you both; the allen key worked perfectly and I can now adjust the tension. It seems to require more turning than I expected to make a small change in tension. Anyway, the reason I was wanting to free the adjustment ring is there is a small but annoying problem with the fine focus. Hard to desc...
by david_b
Mon Jan 13, 2020 9:12 am
Forum: Microscopes and optics
Topic: BH-2 Focus adjustment question
Replies: 16
Views: 183

BH-2 Focus adjustment question

I have a BH-2 and would like to adjust the tension on the focus knob. According to the manual, this is achieved by inserting a screwdriver into one of the holes on the adjustment ring. On the unit I have here, the screwdriver can only be inserted a few mm and there is insufficient leverage to move t...
by david_b
Sun Jan 12, 2020 8:00 am
Forum: Microscopy accessories
Topic: 10x eyepiece for 23.2mm tube that fits this 33mm smartphone holder?
Replies: 9
Views: 134

Re: 10x eyepiece for 23.2mm tube that fits this 33mm smartphone holder?

Wouldn't it be easier and cheaper to buy an adapter that clamps on to your existing 10x eyepiece?
by david_b
Sun Jan 12, 2020 3:59 am
Forum: Microscopy accessories
Topic: 10x eyepiece for 23.2mm tube that fits this 33mm smartphone holder?
Replies: 9
Views: 134

Re: 10x eyepiece for 23.2mm tube that fits this 33mm smartphone holder?

Then I'm not understanding, "I find the 20x lens it comes with to be a little too zoomed in..."
by david_b
Sat Jan 11, 2020 8:24 pm
Forum: Camera systems and imaging
Topic: BH2 BHS MTV
Replies: 36
Views: 462

Re: BH2 BHS MTV

It requires the use of a 10x eyepiece - scroll down the page to see how it installs.
by david_b
Sat Jan 11, 2020 9:19 am
Forum: Microscopy accessories
Topic: 10x eyepiece for 23.2mm tube that fits this 33mm smartphone holder?
Replies: 9
Views: 134

Re: 10x eyepiece for 23.2mm tube that fits this 33mm smartphone holder?

I'm thinking that with a 10x you would see a circular image within the rectangular phone display.
You'd then need to use the phone's zoom to fill the screen.
The supplied 20x eyepiece is doing that for you, optically instead of digitally.
by david_b
Fri Jan 10, 2020 11:55 pm
Forum: Camera systems and imaging
Topic: BH2 BHS MTV
Replies: 36
Views: 462

Re: BH2 BHS MTV

Again, the link in post #5 to the relevant page on Alan Wood's site explains what is needed. You need the photomicro adapter L or a similar third party tube. According to that article, no Nikon adapter is available for the photomicro L, so you can either remove the Olympus mount and replace it with ...
by david_b
Fri Jan 10, 2020 5:33 pm
Forum: Illumination Techniques
Topic: LED vs. Halogen test
Replies: 7
Views: 224

Re: LED vs. Halogen test

Here's my offering...

Image

Image
by david_b
Fri Jan 10, 2020 9:13 am
Forum: Camera systems and imaging
Topic: BH2 BHS MTV
Replies: 36
Views: 462

Re: BH2 BHS MTV

I'm not clear why you are wanting to attach the camera to a TV adapter, instead of one of the adapters listed?
by david_b
Fri Jan 10, 2020 5:47 am
Forum: Camera systems and imaging
Topic: HA2307 HDMI industrial camera
Replies: 43
Views: 6185

Re: HA2307 HDMI industrial camera

I just bought one just like this- has anyone used this with a Macbook computer? Can the images/videos go from camera to hard drive via the USB? I had no luck at all with getting a Mac to see the Hayear camera and ended up using Windows software (IC Measure) running on Parallels. My understanding is...
by david_b
Thu Jan 09, 2020 10:49 pm
Forum: Camera systems and imaging
Topic: BH2 BHS MTV
Replies: 36
Views: 462

Re: BH2 BHS MTV

by david_b
Mon Jan 06, 2020 11:50 pm
Forum: Illumination Techniques
Topic: LED vs. Halogen test
Replies: 7
Views: 224

Re: LED vs. Halogen test

Very good, thank you!
The first LED image shows quite a lot of CA compared to the halogen. Is that banding on the slide?
And it's interesting how differently the colours are rendered in the last pair.
by david_b
Mon Jan 06, 2020 7:41 pm
Forum: Illumination Techniques
Topic: LED vs. Halogen
Replies: 15
Views: 347

Re: LED vs. Halogen

Did you find the 100w BHS to be a microbe-boiler?
by david_b
Sun Jan 05, 2020 8:24 am
Forum: Camera systems and imaging
Topic: New to this: looking to record video on my DSLR
Replies: 28
Views: 401

Re: New to this: looking to record video on my DSLR

I just thought of another question, so sorry! Since my microscope doesn't have any eyepieces and I plan to use it exclusively for photo/video from my DSLR, I'm wondering if there's a connector that allows some adjustable zoom between the eyepiece hole and the camera? From what it looks like, if I d...
by david_b
Sun Jan 05, 2020 8:00 am
Forum: Camera systems and imaging
Topic: New to this: looking to record video on my DSLR
Replies: 28
Views: 401

Re: New to this: looking to record video on my DSLR

Question though: is it possible to remove the bright center spot without having to do post-processing? I tried a few settings on my camera and adjusting the diaphragm and brightness on the microscope without much success. I'm not familiar with Nikon's liveview - can you not control exposure from th...
by david_b
Sun Jan 05, 2020 7:36 am
Forum: Camera systems and imaging
Topic: New to this: looking to record video on my DSLR
Replies: 28
Views: 401

Re: New to this: looking to record video on my DSLR

Despite the CA visible in the high-res image, I remain impressed. ... such performance would have been exceptional with any equipment made a few decades ago ! In the Motic example, there is some slight CA fringing towards the edge of the image, which was not present with the Brunel optic. Also, the...
by david_b
Sat Jan 04, 2020 11:42 pm
Forum: Illumination Techniques
Topic: LED vs. Halogen
Replies: 15
Views: 347

Re: LED vs. Halogen

A potentially interesting direction is the more natural-like balanced illumination from a new kind of LED's... Are you referring to Olympus True Color? https://www.olympus-lifescience.com/en/resources/white-papers/true-color-led/ Hi david_b, not these ones, there was some other brand of LEDs, not a...
by david_b
Sat Jan 04, 2020 11:18 pm
Forum: Camera systems and imaging
Topic: New to this: looking to record video on my DSLR
Replies: 28
Views: 401

Re: New to this: looking to record video on my DSLR

Just out of interest, I repeated the test using my current scope, this time removing the eyepiece instead of using the photo tube.
Motic 40x objective

Image

Image
by david_b
Sat Jan 04, 2020 10:18 pm
Forum: Illumination Techniques
Topic: LED vs. Halogen
Replies: 15
Views: 347

Re: LED vs. Halogen

Hobbyst46 wrote:
Sat Jan 04, 2020 9:50 pm
A potentially interesting direction is the more natural-like balanced illumination from a new kind of LED's...
Are you referring to Olympus True Color?
https://www.olympus-lifescience.com/en/ ... color-led/
by david_b
Sat Jan 04, 2020 9:36 pm
Forum: Camera systems and imaging
Topic: New to this: looking to record video on my DSLR
Replies: 28
Views: 401

Re: New to this: looking to record video on my DSLR

MichaelG. wrote:
Sat Jan 04, 2020 9:10 pm
Incidentally, I estimate the magnification to be about 51.7x ... so it’s presumably a nominal 50x objective.
Checking the same slide on my current scope, it appears to have been the 40x
by david_b
Sat Jan 04, 2020 8:54 pm
Forum: Camera systems and imaging
Topic: New to this: looking to record video on my DSLR
Replies: 28
Views: 401

Re: New to this: looking to record video on my DSLR

The objective is presumably a generic example from one of the Chinese factories - there were no markings to identify the source. Who knows, it could even be the same factory as the OP's Omax. I'm afraid I didn't keep the high res files because the test was redundant after I sold the microscope. I on...
by david_b
Sat Jan 04, 2020 6:16 pm
Forum: Illumination Techniques
Topic: LED vs. Halogen
Replies: 15
Views: 347

Re: LED vs. Halogen

Would be interested to see a side by side comparision of the same slide under LED and Halogen lighting if possible This article is helpful but the images are small: http://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/artjan14/dw-lightcompare.html To me, some of the ...
by david_b
Sat Jan 04, 2020 5:23 pm
Forum: Camera systems and imaging
Topic: New to this: looking to record video on my DSLR
Replies: 28
Views: 401

Re: New to this: looking to record video on my DSLR

I don't recall the objective magnification, but if it helps 1 div = 0.01mm
The microscope I no longer own, but was nothing special - Chinese (Brunel) with plan objectives.