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Forum: Pentax DSLR Discussion 05-05-2019, 03:46 PM  
Travelling with primes
Posted By fwwidall
Replies: 48
Views: 2,206
Please do. Didn't get to see anything of Granada unfortunately, just stopped in the main square for some liquid refreshment before heading back to Malaga on the tour bus. I look forward to seeing your images.

Fred.
Forum: Pentax DSLR Discussion 05-05-2019, 02:31 PM  
Travelling with primes
Posted By fwwidall
Replies: 48
Views: 2,206
Cerebum,

I had the pleasure of spending a few hours at the Alhambra in February 2018, when we stopped in Malaga on a Canary Islands cruise.

I took along my K3, DA15mm, DA40mm, DA70mm and a Sigma 24mm and found that worked out just fine. I also took along my IR converted istDL2 for a different look. The Alhambra is a special place and one could spend a lot of time there.

IMGP9845 by Fred Widall, on Flickr

I posted a thread last year with some of my images if you'd like to see them. Lots more images from the cruise over on Flickr.

Have a great trip.

Fred.
Forum: Post Your Photos! 04-21-2019, 09:19 AM  
Macro Crystals
Posted By fwwidall
Replies: 1
Views: 175
I thought I'd share some more of my recent crystal images.

Over the past few weeks I've been playing around with photographing asorbic and citric acid crystals, as well as Epsom salt crystals.

I've been trying out various lenses on my bellows, as well as reverse mounted on another lens.

I'm using a LED bulb for illumination, and two linear polarizers above and below the crystals. I've also added the clear top off a CD case as a 'retardation plate' (I think that's the correct expression) into the light path which intensifies the colours even more.

Here are a couple from this morning using a Componon-S 50mm F2.8 enlarger lens reverse mounted on a Pentax-M 200mm F4.

IMGP4758 by Fred Widall, on Flickr

IMGP4757 by Fred Widall, on Flickr

Here's some using a noname 10X microscope objective on the bellows.

Untitled by Fred Widall, on Flickr

Untitled by Fred Widall, on Flickr

Untitled by Fred Widall, on Flickr

These were with an Amscope 4X microscope objective on the bellows

IMGP4658 by Fred Widall, on Flickr

IMGP4652 by Fred Widall, on Flickr

I'm looking forward to trying out this technique with snowflakes next winter - but I'll be very happy to enjoy some summer warmth before then :)

Hope you like them.
Forum: Post Your Photos! 04-07-2019, 02:57 PM  
Macro Epsom Salt Crystals
Posted By fwwidall
Replies: 11
Views: 531
I just got my hands on some asorbic acid and immediately had to see what crystals I could get with it.

Travel through a Black Hole.....

IMGP4495 by Fred Widall, on Flick

down into a strange fractal landscape

Asorbic Acid Crystals by Fred Widall, on Flickr

to the very heart of the crystal

Asorbic Acid Crystals by Fred Widall, on Flickr


A fun way to spend a Sunday afternoon :)

Fred.
Forum: Post Your Photos! 04-02-2019, 01:43 PM  
Macro Epsom Salt Crystals
Posted By fwwidall
Replies: 11
Views: 531
Thanks. The crystals do seem to be even more colourful under higher magnification.

---------- Post added 04-02-19 at 04:45 PM ----------



I did come across that site. I think my next attempts are going to be with asorbic and citric acids. Just waiting on Amazon to deliver some.

---------- Post added 04-02-19 at 04:48 PM ----------



I did come across some videos on YouTube showing art made with tape and polarized light. I recently came across the fact that tablets and screens put out polarized light. I did try it out and it worked, but my LED bulb puts out more light. I just stick a polarizing filter on top of it, using an old coffee can to hold it.
Forum: Post Your Photos! 04-01-2019, 01:49 PM  
Macro Epsom Salt Crystals
Posted By fwwidall
Replies: 11
Views: 531
I'm having lots of fun shooting these crystals. I love these amazing colours.

These I shot with a 10X microscope objective mounted on my bellows. The working distance was so small that I couldn't get the polarizing filter between the glass plate and the microscope objective, so I released the front standard from the bellows and stuck the polarizing filter in between it and the bellows. Seemed to work fine.


IMGP4445 by Fred Widall, on Flickr

IMGP4447 by Fred Widall, on Flickr

IMGP4439 by Fred Widall, on Flickr

IMGP4453 by Fred Widall, on Flickr

IMGP4444 by Fred Widall, on Flickr

Fred.
Forum: Post Your Photos! 03-29-2019, 06:08 AM  
Macro Epsom Salt Crystals
Posted By fwwidall
Replies: 11
Views: 531
With the end of winter I've been looking for new macro projects I could use my snowflake rig for and I came across the images of crystals by Robert Brendan over on the Photomacrography site.

I thought that would be interesting to try.

Here are my first few attempts at trying to photograph epsom salt crystals. I dissolved it in water, then let it dry on a glass plate, then photographed it using my snowflake rig. I added polarizing filters below and above the glass plate to get the colours.

I'm pleased with the first results and will be experimenting more with other substances.

IMGP4365 by Fred Widall, on Flickr

IMGP4362 by Fred Widall, on Flickr

IMGP4356 by Fred Widall, on Flickr

Epsom Salt 2 by Fred Widall, on Flickr

Fred.
Forum: Troubleshooting and Beginner Help 03-21-2019, 05:46 PM  
Bought a Miops MOBILE DONGLE for my K10D. But it broke. Need cable to content to K70
Posted By fwwidall
Replies: 4
Views: 520
That's great. Glad I could help. Fred.
Forum: Pentax Camera and Field Accessories 03-14-2019, 03:32 PM  
Some questions about extension tubes and diopters
Posted By fwwidall
Replies: 58
Views: 1,622
Yes, its flat and about 2" square with stud holes on the bottom, part of my grandson's collection. I thought it made a good test target.
Forum: Pentax Camera and Field Accessories 03-14-2019, 01:58 PM  
Some questions about extension tubes and diopters
Posted By fwwidall
Replies: 58
Views: 1,622
Ropuchy,

Have you considered using a reversed lens or microscope objective on extension tubes ? Depending on how much magnification you require it can be an inexpensive solution.

I'm experimenting with that myself. I recently picked up and Amscope 4X microscope object and mounted that on my bellows to shoot snowflakes. I picked up an RMS/M42 adapter which made it very easy to mount and I was very happy with the results.

IMGP4209 by Fred Widall, on Flickr

Its designed to be used with a 160mm tube and when I mount it on that I get a horizontal FOV of about 5.5mm i.e. 4X.

I then tried reversing some of my Pentax lenses on the tubes using a reversing ring.

55mm gave me FOV of 9mm (2.6X)
35mm gave me FOV of 5mm (4.7X)
28mm gave me FOV of 4mm (5.9X)
15mm gave me FOV of 2mm (12X)

They all had pretty decent working distances, surely compared to regular microscope objectives.
I upload a test shot to Flickr

Lens magnification tests by Fred Widall, on Flickr


Top image was with a Pentax-A 100mm F2.8 Macro (1X).

For comparison the Lego 'button' is approx. 5mm across.

Hope that helps.
Forum: Troubleshooting and Beginner Help 03-14-2019, 07:51 AM  
Bought a Miops MOBILE DONGLE for my K10D. But it broke. Need cable to content to K70
Posted By fwwidall
Replies: 4
Views: 520
I wonder if this 3.5mm male to 2.5mm male cable would work ?

Alternatively there are 3.5mm male to 2.5mm female adapters that should work. Plug the adapter into your K70 and your existing cable into it. There seem to be a number of variations on Ebay.

Hope that helps.

Fred.
Forum: General Photography 03-10-2019, 08:09 AM  
The "Vintage Digital Camera" thread (celebrating old, obsolete digital cameras!)
Posted By fwwidall
Replies: 47
Views: 2,202
I started out with an Optio 33L purchased back in June 2003.

I moved up to an istDS in December 2004. I still have the istDS and I picked up another one last year. I'm using them as a dual camera rig for experimenting with stereo/3D images.

Soccer Anaglyph by Fred Widall, on Flickr

I also have an infrared converted istDL2 which works well for false colour infrared.

IMGP1368 by Fred Widall, on Flickr

I also have an old Sigma SD14 which I used for B&W infrared, but sadly it has been unused since I got the istDL2. I really should start using it again or send it to a new home.

SDIM3081 by Fred Widall, on Flickr
Forum: Post Your Photos! 03-07-2019, 08:31 AM  
Macro Snow crystals
Posted By fwwidall
Replies: 9
Views: 421
Well, looks like I'm done for another season. No snow, and warmer temperatures forecast for the next 14 days so its time to pack up the gear just when I have everything working the way I want. I got some great images and I can be sure the snow will be back again in another 8 months or so to delight and annoy me :)

I'll leave you with a poster I put together showing my images (mostly from this year).

Snow Crystals by Fred Widall, on Flickr

Fred.
Forum: Post Your Photos! 03-01-2019, 11:12 AM  
Macro Snow crystals
Posted By fwwidall
Replies: 9
Views: 421
If you'd like to see more of my images of these amazing objects please check out the slideshow I uploaded to YouTube yesterday.
















You Tube






Hope you like it.

Fred.
Forum: Post Your Photos! 02-27-2019, 07:28 PM  
Macro Snow crystals
Posted By fwwidall
Replies: 9
Views: 421
If you'd like to learn more about how snowflakes form check out Ken Libbrecht's lecture called "The Secret Life of a Snowflake: An Up-Close Look at the Science and the Splendor of Nature's Frozen Art" presented at the Perimeter Institute in Waterloo, Ontario on Feb 1st, 2012.

Had a large variety of crystals today. This morning I was getting 'plates' which are about the size of a pinhead, and now we're getting large crystals measuring about 8mm across. Even with my bellows minimized they're too big to fit in the frame. I like the little guys the best.
Forum: Post Your Photos! 02-27-2019, 03:53 PM  
Macro Snow crystals
Posted By fwwidall
Replies: 9
Views: 421
Its been snowing all day here and I've had to shovel the driveway four times to keep up with the snow, but I've been capturing some great crystals today.

Some of them had wonderful symmetry like this guy.

[IMGP4213 by Fred Widall, on Flickr
Forum: Post Your Photos! 02-27-2019, 06:36 AM  
Macro Snow crystals
Posted By fwwidall
Replies: 9
Views: 421
Out hunting snow crystals before breakfast today - I'm glad I did, as I got some really nice hexagonal plates.

WIP by Fred Widall, on Flickr

IMGP4167 by Fred Widall, on Flickr

IMGP4155 by Fred Widall, on Flickr

IMGP4151 by Fred Widall, on Flickr

IMGP4141 by Fred Widall, on Flickr

IMGP4140 by Fred Widall, on Flickr

This one appears to be a column with five attached plates.

column by Fred Widall, on Flickr
Forum: Pentax SLR Lens Discussion 02-20-2019, 10:48 AM  
SuperTakumar 1:1.4/50
Posted By fwwidall
Replies: 12
Views: 613
Check out the very detailed info at the Takumar Field Guide.

The serial number and the model number (on the under side of the M/A switch) will enable you to precisely identify and dat what you have.

Fred.
Forum: Post Your Photos! 02-20-2019, 09:53 AM  
Macro A few more snow crystals
Posted By fwwidall
Replies: 9
Views: 455
Brian,

Welcome to the wonderful, and addictive, world of snowflake photography. I saw your post and you're off to a good start.

The 10X is a no-name one I picked up cheap on Ebay. As I mentioned I can get down to almost a 1mm FOV with that on my bellows.

I was mostly using a El-Nikkor 50mm F2.8 enlarging lens, but I think the Amscope 4x is sharper, although it does seem to have a fair amount of CA, but that's easily fixed.

Fred.
Forum: Post Your Photos! 02-19-2019, 08:07 AM  
Macro A few more snow crystals
Posted By fwwidall
Replies: 9
Views: 455
Hi Zman.

Yes, I'm very happy with the latest version. The microscope base makes focussing much easier, especially when using the big screen and the LED bulb lets me see what the captured image will look like. I made it with 1x2" wood and its a little shaky. Next time I'll use 1x4" to make it sturdier.

The microscope objective seems to have a fair amount of CA but I can remove most of it in PP, although I'm not finding the extra colours objectionable.

I can't argue with the results I'm getting.

IMGP4102 by Fred Widall, on Flickr

You should post some of your images.

Fred
Forum: Post Your Photos! 02-18-2019, 04:17 PM  
Macro A few more snow crystals
Posted By fwwidall
Replies: 9
Views: 455
Here's one more from this morning I can't resist posting - a sad little snowflake face :)

IMGP4078 by Fred Widall, on Flickr
Forum: Post Your Photos! 02-18-2019, 06:51 AM  
Macro A few more snow crystals
Posted By fwwidall
Replies: 9
Views: 455
Thank you for the very kind comment.

Seeing these incredible images appear on the screen is always a 'WOW' moment for me, so much so I tend to stay out in cold too long with numb fingers and toes. But then when something like this shows up its all worth it.

IMGP4053 by Fred Widall, on Flickr


It was -11C this morning and I was out on the hunt before my morning coffee. It was worth it. Mostly just icy junk but there were some great crystals in amongst the crap.

IMGP4069 by Fred Widall, on Flickr

IMGP4065 by Fred Widall, on Flickr

---------- Post added 02-18-19 at 08:51 AM ----------



You're most welcome.
Forum: Post Your Photos! 02-17-2019, 12:16 PM  
Macro A few more snow crystals
Posted By fwwidall
Replies: 9
Views: 455
After a couple of weeks of intense cold, followed by lots of blowing snow I've finally been able to get out and shoot a few more snow crystals.

I've been using my recently acquired, inexpensive, AmScope 4X Plan Achromatic Microscope Objective Lens (Model No: PA4XK-V300). Seems to work pretty good.

IMGP4015 by Fred Widall, on Flickr

IMGP3979 by Fred Widall, on Flickr

IMGP4004 by Fred Widall, on Flickr

IMGP4041 by Fred Widall, on Flickr

Here's my current setup.

IMGP5564 by Fred Widall, on Flickr

Here I'm using the 4X microscope objective attached to a Pentax Auto Bellows, which is mounted on my Pentax K5.

For lighting I'm using a 6.5W LED bulb (almost no heat). The light shines up through a sheet of glass on my homemade stand.

I collect the snow crystals on another sheet of glass which is then mounted on the base from an old Zeiss microscope.

The camera remains stationary and I focus using the microscope base, which allows very fine control.

I have the camera in 'LiveView' mode and the output is fed to an old computer monitor using a HDMI cable.

I use two Yongnuo RF603 triggers to fire the shutter in 2 second delay mode to minimize camera shake.

The image being displayed on the screen is a ruler. As you can see my horizontal FOV is a little over 4 mm. I can get down to approx. 1mm with a 10X objective

Simple :)
Forum: Post Your Photos! 01-31-2019, 06:18 AM  
Macro First Snow Crystals of 2019
Posted By fwwidall
Replies: 15
Views: 730
Its not too difficult to get started.


The two basic techniques are to light the crystal from above or below. I chose to go with the latter. Here's an image of the rig I started out with back in 2008. If you read the description there's a writeup of my workflow.

Snowcatcher Mark II by Fred Widall, on Flickr

Over the years I've tried tweaking things to improve things, the latest tweaks being a microscope base for ultra fine focus control, and a microscope objective for extreme closeups. But, some of my favourite images were shot with the original rig. A 50mm lens on a bellows, or extension tubes, will get you pretty close. Here's an image from back then using that rig.

Snowflake_080011 by Fred Widall, on Flickr


The other technique is to light from above which give a totally different look to the crystal.

Snowflake by Fred Widall, on Flickr

Don Komarechka is the master of that technique. Check out this video where he explains his method in great detail.















You Tube





Hope that helps.

Fred.
Forum: Post Your Photos! 01-29-2019, 10:04 AM  
Macro First Snow Crystals of 2019
Posted By fwwidall
Replies: 15
Views: 730
I feel your pain :)

We had probably close to a foot come down last night so I was out with my snowblower this morning doing my driveway and those of my neighbours.

Last year I picked up a cheap 10x microscope objective on ebay to try using for macro photography. Last night I tried it on snowflakes for the first time.

Wow !! This tiny crystal (approx 1mm) just about filled the whole frame. The downside is that working distance is very small, and the lens is just about touching the snow crystal. It would be impossible to front light it.

DOF is incredibly narrow, so I shot 8 images and used focus stacking for the final image.

IMGP3732 by Fred Widall, on Flickr

One straight from camera.

IMGP3837 by Fred Widall, on Flickr
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