Search found 193 matches

by kaleun96
Fri Mar 29, 2019 1:32 am
Forum: Equipment Discussions
Topic: Polaroid 43.53mm F/6.6
Replies: 22
Views: 6913

To me this indicates that the 8000 line resolution figure is in lines (pixels) per picture height for 6x7 cm film. That would be 4000 line pairs per picture width, not per inch. That makes more sense and so for 35mm film, at 36mm across, we'd be looking at ~111lpmm? Looks like a real gem! What were...
by kaleun96
Thu Mar 28, 2019 3:44 pm
Forum: Equipment Discussions
Topic: Polaroid 43.53mm F/6.6
Replies: 22
Views: 6913

Good test, very good find. I read the brochure you linked to, and maybe that resolution figure represents the number of lines across the whole image, not per inch? Thanks Lou. I've come across a few other bits of information on the resolution: "The Polaroid HR 6000 was purchased in 1999. It has twi...
by kaleun96
Thu Mar 28, 2019 1:50 pm
Forum: Equipment Discussions
Topic: Polaroid 43.53mm F/6.6
Replies: 22
Views: 6913

Polaroid 43.53mm F/6.6

Picked up this lens from BMI surplus in as-is condition. No threads on either end so I mounted it in some polymorph plastic with a 30.5mm male thread providing the mold for the female threads. http://www.photomacrography.net/forum/userpix/7018_lens_1_2.jpg http://www.photomacrography.net/forum/userp...
by kaleun96
Mon Mar 25, 2019 12:12 am
Forum: Equipment Discussions
Topic: Some lens tests at 0.7x with an ancient coin
Replies: 40
Views: 7675

Thanks Robert. Yeah I couldn't find much info on that lens and even with Ray's help in that thread we can only assume it came from something like a Colortrak.
by kaleun96
Thu Mar 21, 2019 1:27 am
Forum: Equipment Discussions
Topic: Update on DIY Precision S&S System
Replies: 7
Views: 3150

Coming along nicely! Do you have any physical controls for moving the rails (e.g. joysticks, buttons) or is everything done over serial? I'm still struggling with the Trinamic devices but have the Pololu Tic-500 working well. Tell me about it. I picked up the TMC2130 and it's pretty difficult to fin...
by kaleun96
Wed Mar 20, 2019 9:46 am
Forum: Equipment Discussions
Topic: Some lens tests at 0.7x with an ancient coin
Replies: 40
Views: 7675

Yeah and I've been looking for a 4/60 the past few weeks and haven't had any luck so far. The other variations seem to come up occasionally under one of the three brands though.
by kaleun96
Wed Mar 20, 2019 8:21 am
Forum: Equipment Discussions
Topic: Some lens tests at 0.7x with an ancient coin
Replies: 40
Views: 7675

The lights may not be optimized for the ones with longer WD but at least they are all the sam In this case the setup wouldn't have been too different. All using the same flash with TTL on the same settings, coming from the same angle (left of the camera), but the degree of that angle would've chang...
by kaleun96
Wed Mar 20, 2019 12:13 am
Forum: Equipment Discussions
Topic: Some lens tests at 0.7x with an ancient coin
Replies: 40
Views: 7675

I'll say it before someone else does - it's easier to compare lenses if the lighting stays the same ! How do you manage this when the working distance varies so much between lenses? Of the top of my head it varies from maybe 5-20cm between these lenses. The light source is always the same and on th...
by kaleun96
Tue Mar 19, 2019 4:16 pm
Forum: Equipment Discussions
Topic: Some lens tests at 0.7x with an ancient coin
Replies: 40
Views: 7675

Some lens tests at 0.7x with an ancient coin

I'm still a bit new to testing lenses at any level that could be considered serious, these are just some quick tests I have been doing to see how a few of my lenses compare. I'll likely be adding a few here and there over time. My interest isn't coin macrophotography, nor the 0.5-1x range, but I jus...
by kaleun96
Tue Mar 12, 2019 6:21 am
Forum: Equipment Discussions
Topic: Schneider Apo Componon HM 6.7/60
Replies: 17
Views: 5929

The mfrs likely fix the aperture at the best position for overall performance in the system, and my purposes seem to overlap. Nice that was my thinking too! Stacking ancients is a time honored tradition. Interesting, I haven't come across it much myself in the circles I frequent. But some auction h...
by kaleun96
Mon Mar 11, 2019 3:38 pm
Forum: Equipment Discussions
Topic: Schneider Apo Componon HM 6.7/60
Replies: 17
Views: 5929

Thanks Ray, good to see the 6.7/80 did well in your 80mm coin shootout too! On that note, I collect a few ancient coins here and there and will make subjects of them one of these days. The relief on them can be pretty extreme so they will really test my stacking capabilities. The milling was likely ...
by kaleun96
Mon Mar 11, 2019 3:15 pm
Forum: Equipment Discussions
Topic: Schneider Apo Componon HM 6.7/60
Replies: 17
Views: 5929

Schneider Apo Componon HM 6.7/60

I managed to snag this Apo HM 6.7/60 today on eBay for quite cheap: https://www.ebay.co.uk/itm/Schneider-Kreuznach-APO-Componon-HM-6-7-60/254159619891 It's in "as is" condition as a large part of the side was milled out and tapped (inserts?) for threads. I'm hedging the optics are still ok but it's ...
by kaleun96
Fri Mar 08, 2019 2:23 pm
Forum: Equipment Discussions
Topic: How does StackShot know when it has reached the rail limits?
Replies: 27
Views: 5781

Those look like the connectors Wemacro uses, they are really robust but very bulky. I've tried to stay with something much smaller since I have a lots of cables and PCB interfaces with the Precision S&S in development , this is why I didn't consider them. I see they have a GX12 that is marginally s...
by kaleun96
Fri Mar 08, 2019 1:55 pm
Forum: Equipment Discussions
Topic: How does StackShot know when it has reached the rail limits?
Replies: 27
Views: 5781

What about GX16 connectors? They are not unlike DIN in general appearance, but differ in the presence of a threaded collar that prevents the plug from accidentally falling out of the socket, and in the fact that the male pins are on the panel socket rather than on the cable plug (at least in all GX...
by kaleun96
Fri Mar 08, 2019 12:33 pm
Forum: Equipment Discussions
Topic: How does StackShot know when it has reached the rail limits?
Replies: 27
Views: 5781

Cool to see you got it working! They're a much cleaner limit sensor than switches in my opinion. I've got a TMC2130 on the way to try its method of limit detection (i.e. stall detection). I think I will redesign my circuitry since I can now do away with the limit switches, at least I hope so. Mike, ...