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Forum: Monthly Photo Contests 07-03-2019, 04:17 PM  
New Growth
Posted By Damian
Replies: 25
Views: 461
I would like to nominate this photo
Forum: Monthly Photo Contests 07-03-2019, 04:16 PM  
Flowers to be
Posted By Damian
Replies: 5
Views: 160
I would like to nominate this photo
Forum: Monthly Photo Contests 07-03-2019, 04:15 PM  
June Photo Contest - Macro Flowers and Plants. Purple, Green, and Yellow.
Posted By Damian
Replies: 2
Views: 212
I would like to nominate this photo
Forum: Monthly Photo Contests 06-12-2019, 07:33 PM  
June Photo Contest - Macro Flowers and Plants. Purple, Green, and Yellow.
Posted By Damian
Replies: 2
Views: 212
Picture of Purple and Green hanging flowers that grow in a clump of grass in my back yard. I don't know what they are called, but they are pretty.
Forum: Lens Clubs 02-29-2012, 10:25 PM  
The impossible lens club?!
Posted By Damian
Replies: 482
Views: 165,185
I really have no idea. Maybe an industrial fastener / tool company like Granger or Fastenal. Otherwise maybe you can cannibalize a part from an old broken zoom lens. Otherwise probably need to have it fabricated. Maybe someone else would have a better idea..... aliasant.......ripit...... ovim.......
Forum: Lens Clubs 02-18-2012, 12:00 PM  
The impossible lens club?!
Posted By Damian
Replies: 482
Views: 165,185
Topcon UV lenses use a different mount and registration distance then the RE-Topcor / Exakta mount. There is also no aperture assembly in the lens. It's mounted on the camera.

Douglas, from what I've heard, and I could be wrong, the UV Topcor system was thier "budget" camera system and most of the lenses are not of sufficient quality to bother with. I have no first hand experience so, as I said, I could be wrong. There are decent deals out there for RE-topcor's, you just have to be patient and keep looking. Also, since you will be taking the lens partially aprat for the conversion, you may not want to discount buying lenses with "issues". You can usually get them quite cheap. I picked up my 58 1.4 for under $50 because of "issues". I also recently missed (was at work) a 35 2.8 with stuck aperture blades go for under $40 on ebay. I really need to download the ebay app for my android.

Sorry I haven't been around for a while. Work, scouts, children and family, have kept me very busy these last 3 months. I still have not completed my 58 1.4 and it doesn't look like I will have time for at least a few more months. Until then, it sits on my desk in front of me to be admired for it's aesthetic beauty.
Forum: Lens Clubs 11-20-2011, 02:12 PM  
*Macro* lens club
Posted By Damian
Replies: 4,072
Views: 546,873
Some afternoon fun with leaves and back lighting. Tamron Adaptal-2 SP 90mm f2.8
Attachment 109609

Attachment 109610
Forum: Lens Clubs 11-12-2011, 11:34 AM  
The impossible lens club?!
Posted By Damian
Replies: 482
Views: 165,185
Aliasant, thanks for the information. I may try to do the infinity stop mod if I can't figure out another solution.

Ripit, The standard m42 adapter I have is only .80 mm thick and would work perfectly if not for the issue with the spring on the aperture ring that depresses the click stop ball bearing. That little spring is held in place by the aperture position pin/plate thing that moves with the aperture position. That pin/plate isn't necessary for the conversion but the spring is. So I need to encaplsilate it into the new mount - with room to move - so that I will have click stops. Without is the springs on the aperture overpower the friction of the blades and it returns to f3.5 or greater when not held. So I wouldn't be able to use f1.4, f2, f2.85 etc without holding the aperture ring in place. Anyway, I either have to mill down my 62mm reverse ring or find a thinner 62mm reverse ring or use a standard m42 mound, make a circular shim the correct size and thickness and solder it to the m42 ring.

The wavy piece of metal under the aperture position pin/plate is the spring that pushes down on the ball bearing for click stops.
Attachment 108896
Forum: Lens Clubs 11-08-2011, 02:36 PM  
The impossible lens club?!
Posted By Damian
Replies: 482
Views: 165,185
2mm roughly. It varies from side to side by up to .09mm. 2-2.02mm on one side to 2.09-2.11mm on the other. Basically, it's not entirely flat. Chinese quality control.



I've only messed with the 58 1.8 other then the 58 1.4. I took the optics out of the 58 1.4 for cleaning, but did not mess with the focusing helical. It worked fine, so there was no need to fix it. I can't remember if there are any shims or rings that can be removed. I'll have to go back and look at the pictures from the cleaning to see if there is anything visible. That might be an option though. My goal for this project was to make no modifications to the lens, but simply swap mounts. Totally reversible modification in case I don't like the lens, I can revert it and sell it like it was. Typically they are worth more as collectors items then as "modified for pentax".
Forum: Lens Clubs 11-08-2011, 08:32 AM  
The impossible lens club?!
Posted By Damian
Replies: 482
Views: 165,185
I purchased a 62mm reverse pk adapter. The main adapter plate is 1.15mm thicker then necessary to get infinity focus. Everything else will work, I just need to mill down the plate. Otherwise I'll need to use a standard m42-pk adapter and add a flange to hold the aperture ring in place and provide a home for the spring.
Forum: Lens Clubs 11-07-2011, 08:06 PM  
The impossible lens club?!
Posted By Damian
Replies: 482
Views: 165,185
Failure!

My Topcor 58mm f1.4 conversion solution won't work the way I hoped. Luckily I know a man with a lathe who is willing to work for beer and conversation. Of course, I may get bored and try the shim solution instead. We'll see.
Forum: Lens Clubs 11-03-2011, 09:21 AM  
Macro by any means necessary club
Posted By Damian
Replies: 557
Views: 114,336
Nice depth in the wing casings. They look translucent.
Forum: Lens Clubs 11-03-2011, 09:19 AM  
The impossible lens club?!
Posted By Damian
Replies: 482
Views: 165,185
Is that a piece of wire wrapped around the stop down lever holding the aperture in the "manual" position. Is that a permanent solution? Not the "prettiest" I must say. But hey, if it works that's all that really matters.
Forum: Lens Clubs 11-01-2011, 07:34 PM  
The impossible lens club?!
Posted By Damian
Replies: 482
Views: 165,185
I really need to check the forum more often. That's awesome aliasant! Great job. It's amazing how many great diy ideas pop up in here.
Forum: Lens Clubs 10-24-2011, 05:53 PM  
The impossible lens club?!
Posted By Damian
Replies: 482
Views: 165,185
Sorry so late to the discussion. I've been chasing my tail for the last several weeks. Between cub scouts with my son, my baby girl, my wife out of town for a week, work, relatives, and preparing for my annual Halloween party, I haven't had time to sleep much, let alone check my subscribed threads. I know Aliasant already answered the question, but I figured since you seemed to be asking me, I might as well be polite enough to answer. Personally I use Ronsonol, which in reality is nothing more then Naphtha. It worked well enough, but next time I might give acetone a try since most seem to agree that it works well. Normally, I just soak a flat cotton swab in Naphtha and place it on the side of the lens element needing cleaning and then put a piece of cellophane over it to lock in the vapors. Leave it like so for a while then check to see if it's doing the job. Anyway, I'm glad your cleaning met with success. Don't forget to bathe the lens in UV light for a few hours a few days in a row to kill any fungus you can't see. Oh, and welcome to the thread, I'm a relative new comer myself.

Update on other projects: I finally, after three separate orders to china, got the 62mm reverse macro adapter I need to complete the Topcor 5.8cm f1.4 conversion. I was sent 58mm adapters with step up rings twice instead of the "pictured" 62mm one piece adapter. I'm glad the sellers were reasonable enough to refund my purchase and let me keep the extra adapters. Apparently 62mm reverse macro adapters in k mount are becoming scarce. In hind sights I probably should have done what Ripit suggested and just used parts I had on hand to make a shim, but hey, I have what I need now. I'll try to get to this in the next few weeks, but things are getting more and more hectic by the week as we approach the holidays. I'll get to it eventually. I'm probably going to have to shelve the Canon FL bellows conversion till after Christmas though. If only I could buy time in a can.....
Forum: Pentax Camera and Field Accessories 10-14-2011, 07:28 AM  
Pentax Q to K mount adapter ?
Posted By Damian
Replies: 23
Views: 8,369
George Mallory, one of the first to try to climb Mount Everest, when asked by a reporter "why do you want to climb Mount Everest?" he replied "Because it's there". The same logic applies to mounting K lenses on a Q body.
Forum: Pentax SLR Lens Discussion 10-12-2011, 07:27 PM  
Vivitar 100mm 2.8 M42
Posted By Damian
Replies: 6
Views: 9,225
Get a Super Tak 105/2.8. I love mine. It has a very nice quality to the rendering you just don't see from modern lenses. Picked one up for $65 a while back. If you ask me, that's a bargain considering how good it is.
Forum: Lens Clubs 10-10-2011, 10:06 AM  
Macro by any means necessary club
Posted By Damian
Replies: 557
Views: 114,336
Wow, I honestly didn't expect any comments regarding the stone. But you are probably right, I'm thinking it is a Tanzanite as well. I've done a lot of research on both Tanzanite and Sapphire because of this little issue. It is possible though for a Sapphire to become scratched or chipped during normal wear. But it is unlikely. All around us, in everyday materials there are microscopic particles of diamond and other precious stones. They are too small to see or gather. So even a sapphire or a diamond can become scratched in everyday use. I've also seen hard stones damaged by impact with materials softer then themselves, yet still hard, such as granite, concrete, quartz, and steel. So basically, though it is most likely a Tanzanite, the only way to know for sure is to have it analyzed. If it is a Tanzanite, it's not the end of the world. To have a high quality sapphire of the same size set would only cost about $250-$350, which isn't bad considering what I paid for the ring to begin with. Yes, I'm a cheap bastard, but so is my wife, so it's all good. She actually said she would prefer to keep it for now. Regardless of what it is, she likes the look of it.



I'm thinking I may have to try again, but focus on the flat face of the stone to see if I can get a better look at the scratches.



That's why I posted these. I was actually happy enough with the results from the stack of the 135mm with the 24mm, but I already had everything set up so I decided to see how deep I could go. I'm fairly pleased with the results, but I think it's about time to invest in a good linear stage if I'm ever going to try this again. My cheapo macro rails just aren't precise enough and are very frustrating to use.
Forum: Lens Clubs 10-09-2011, 07:46 PM  
Macro by any means necessary club
Posted By Damian
Replies: 557
Views: 114,336
So my wife had her engagement ring worked on recently as it had lost a few of it's itty bitty diamonds that surround the sapphire in the middle. While discussing the service work, the jeweler told her that the sapphire in the ring looked more like a Tanzanite then a Sapphire due to a large amount of scratching and other damage on the stone. He suggested she get it analyzed in a spectrometer to know for sure. When she came home and told me this I of course was less then happy because the ring was sold to me as a Sapphire. Before anyone says "that's what you get you cheap bastard" she picked it out from this place that carried antique jewelry online and I bought it without her knowledge to surprise her when I proposed a few years back. After she told me the news I performed all the known do-it-yourself tests on the stone to see if I could determine if it was a Sapphire or not. The tests were inconclusive. So I decided to investigate these scratches and gouges myself. Not having a microscope, reversed lens stacking is my only means of seeing into the sub-macro world. Here's what I found.
Just for everyone's knowledge, all the pictures below were subject to minimal post processing. Auto Levels, contrast adjust, re-size and finally minimal sharpening.

Here's a the ring at close to 1:1 for comparison. I used a Tamron Adaptall-2 90mm 2.8 macro at f11.
Attachment 105715

Roughly 1.80:1. This was the first stack using both my macro lenses stacked. I was actually the least pleased with the results from this combination. Tamron AD2 90mm 2.8 with Sigma 50mm 2.8 reversed. Both lenses were set to f4 for this shot. I tried only setting the aperture of the Sigma to f5.6, but the vegnetting was very pronounced, so I compromised by setting both lenses to f4.
Attachment 105714

Roughly 3.75:1. This ones is using the same Tamron 90mm but wide open this time with a Miranda (Cosina, Vivitar) 24mm f2.8 reversed and set to f5.6.
Attachment 105710

Roughly 5.63:1. This was taken using a Pentax-A 135mm f2.8 wide open with the same Miranda 24mm reversed and set to f8.
Attachment 105711

Roughly 8.33:1. Now we start getting really close. Taken using an old M42 Auto Mamiya Sekor 200mm f3.5 wide open with the same Miranda 24mm reversed and set to f8. The flare spot you see is probably a result of the older singles coated optics of the Mamiya Sekor. Regardless, resolution held up nicely.
Attachment 105712

Roughly 16.67:1. This was by far the hardest shot to take and is the only keeper out of about 20 shots. It probably could have been sharper, but it's hard to get sharp results at that magnification when there are two little boys chasing each other around the house sending vibrations through the floor system. Taken using a Tokina SD 400mm f5.6 with the same Miranda 24mm reversed and set to f5.6.
Attachment 105713

I'm still not sure if it's a Sapphire or a Tanzanite. Assuming this really is an antique stone and setting, it's possible the the sapphire was damaged when purchased and we just haven't noticed until told. I guess I'm just going to have to get it spectrally analyzed to know for sure.
Forum: Lens Clubs 10-05-2011, 07:32 PM  
The impossible lens club?!
Posted By Damian
Replies: 482
Views: 165,185
That sounds right. I know the A pin tells the camera the lens is set to "A". I'm not sure if it does that via grounding out or if it acts like a button.
Forum: Lens Clubs 10-04-2011, 08:55 PM  
The impossible lens club?!
Posted By Damian
Replies: 482
Views: 165,185
Thanks for the info. I saw that thread not long ago. Thankfully Google Chrome translates Russian. I will eventually try a FD or FL conversion, but not on this lens. It's worth too much and I'm sure someone else will appreciate it far more then I.



Actually no I don't. I have 3 50ish f1.4 lenses though and rarely use them wide open. So it's hard to justify the need for an f1.2 lens considering I usually shoot 1.4 lenses at f2.



I've pretty much decided to do just that. Well except the throwing part. I'd much rather sell it and I think it would be worth far more undamaged. I'm not decided on what to purchase with the profits. I probably won't get a Pentax 50mm f1.2, I'll probably get a Limited lens of some sort. I've been eyeing the 31mm limited and the 77mm limited for some time now. The 70mm limited looks damn good too. Though I won't make enough from the sale of this lens to purchase what I want, I have several other items i'm getting rid of. Hopefully I can raise enough money to have my choice.




Great work on the Topcor 35mm f2.8. It looks like it takes a pretty sharp picture too. I'm jealous, but not of the rectangular aperture of course. I'm still looking for one myself. Hopefully I will eventually find one at a decent price. Like under $50. I have trouble justifying spending more then that on something I have to convert. Unless it is truly special.
Forum: Lens Clubs 10-01-2011, 08:35 PM  
The impossible lens club?!
Posted By Damian
Replies: 482
Views: 165,185
So, I have an interesting dilemma. I was at the flea market today, and stumbled across a camera bag with a very nice looking lens sticking out the top. I took a closer look and there in front of my eyes was a Canon FL 55mm f1.2 lens attached to a Canon FT camera. Without looking too interested, I looked over everything and was pleasantly surprised to find the lens, camera, bag, filter assortmant, camera instruction manual, flash and other doodads all in very good and well cared for condition. I looked around some more and talked to the guy about some other items and then asked how much for the camera. The guy told me $100 bucks, I told him $50 +throw in the lizard toy my son was begging me for and he had a deal. We shook hands, the camera became mine and 50 of my hard earned dollars became his. So the dilemma is, do I keep this nice piece of glass and risk destroying/devaluing it in an extensive, difficult, and irreversible lens conversion, or do I sell it on flea-bay for the roughly $300 these are currently going for and use that money to buy a lens I don't have to convert. I already have some very very nice 50ish glass. I don't really 'need' another, but 'need' isn't the point of LBA is it? Anyway, opinions from informed canon lens owners/hackers would be apprciated. I have been wanting to try a canon conversion, just wasn't planning on cutting my teeth on a relatively expensive piece of glass.
Forum: Lens Clubs 10-01-2011, 06:26 AM  
SIGMA 10-20mm CLUB
Posted By Damian
Replies: 3,836
Views: 879,714
Very nice mike. Great colors too. The fade from yellow/orange to deep violet/blue is quite effective.
Forum: Pentax SLR Lens Discussion 09-24-2011, 12:49 PM  
Samyang 35mm f1.4 now Available
Posted By Damian
Replies: 228
Views: 71,035
Again, very nice! If most of those are at f1.4 or close to it, I'd have to say it's quite good wide open and worth the price. Even if it doesn't have AF.
Forum: Pentax SLR Lens Discussion 09-22-2011, 07:56 PM  
Samyang 35mm f1.4 now Available
Posted By Damian
Replies: 228
Views: 71,035
I know how you feel.

Very nice indeed! I think this one just ended up on my must buy list. The question now is, will it be the Samyang 35mm or the 70 Limited first. Decisions, decisions.
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