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Forum: Macro Photography 09-23-2017, 02:02 AM  
Help with magnification calculation
Posted By Nass
Replies: 7
Views: 554
It would indeed make a difference to the calculation but not one that I have a formula for.

Maybe it's something it's something to add during the winter month downtime to http://extreme-macro.co.uk/calculators/

But I completely agree, a shot of a ruler is by far the best way to measure (the equations we use are approximations because of thin lens assumptions)
Forum: Macro Photography 09-23-2017, 01:58 AM  
2 to 1 Macro
Posted By Nass
Replies: 8
Views: 483
Hard but fun though :)
Forum: Macro Photography 09-23-2017, 01:57 AM  
Drinky Cup Macro Flash
Posted By Nass
Replies: 2
Views: 521
Yep, does direct the light but you have to say it's pretty harsh without diffuser sheet in front! Imagine that on a shiny bug
Forum: Macro Photography 09-23-2017, 01:54 AM  
Lynx Spider @ 2:1
Posted By Nass
Replies: 9
Views: 548
yeah I have to say those eyes did make me think salticidae
Forum: Pentax SLR Lens Discussion 08-27-2017, 06:13 PM  
I've never seen a lens design like this.
Posted By Nass
Replies: 5
Views: 949
Very cool indeed!
Forum: Macro Photography 08-08-2017, 01:35 PM  
Macro with pop-up flash & snoot
Posted By Nass
Replies: 8
Views: 689
Very nice. The thing about the popup flash is that it's usually so slow to recharge, otherwise I'd use it a lot more
Forum: Macro Photography 06-10-2017, 11:31 PM  
I Need Some Stacking Help
Posted By Nass
Replies: 10
Views: 656
Like Doundounba said, smears like that happen because of alignment discrepancies at the extremes of the image plane on the sensor. I almost always get them regardless of which of my systems I use. Best is just to crop it out.
Forum: Macro Photography 05-30-2017, 01:52 PM  
New focus stacking rail
Posted By Nass
Replies: 17
Views: 2,370
I've had one very positive opinion from someone who bought it, but not a detail review of any sort. By the sounds of things it sounds as if it's good though :)
Forum: Macro Photography 05-28-2017, 11:18 PM  
My First Stacks!
Posted By Nass
Replies: 9
Views: 860
Bravo! It's so exciting when you get your first successful stacks through, well done :). On top of that you've chosen one of the hardest things to get right, the needle. If anything is going to show up un-diffused lighting and a wide tonal range, shooting the highly reflective metal of the lighting will do it :). I remember when I was at a similar stage to you, the next thing I spent a looooong long time at was diffusion, experimenting with diffusers, understanding it, making lots of them. Might be worth spending some time at?
Forum: Pentax K-30 & K-50 05-28-2017, 05:01 PM  
Canīt reach focus
Posted By Nass
Replies: 4
Views: 626
Are you using the same m42 adapter on the 500 as you use on the 200 or 400 when they reach infinity? It does matter, because some of the M42 adapters add a little bit of extra distance between lens and camera, and the effect of that is the loss of the ability to reach infinity focus. It's a bit like using extension tubes but the reverse - us macro types use them to be able to focus closer than the lens would do on its own, but the corrollory of this is that you also use infinity focus.
Forum: Post Your Photos! 05-28-2017, 04:58 PM  
Nature My hummers are back
Posted By Nass
Replies: 18
Views: 555
Lovely things :). Wish we had them in the UK
Forum: Flashes, Lighting, and Studio 05-28-2017, 04:56 PM  
Question about trigger voltage and using older flashes with Pentax DSLR's
Posted By Nass
Replies: 33
Views: 1,213
Good advice from Pathdoc
Forum: Welcomes and Introductions 05-28-2017, 01:56 PM  
Manchester, UK
Posted By Nass
Replies: 8
Views: 267
Warmest welcome from a fellow UK-based Pentax guy. :). Manchester has been on our minds a lot this week :(
Forum: General Photography 05-23-2017, 01:19 PM  
Question for flickr users.
Posted By Nass
Replies: 18
Views: 1,014
Not worried, no plans to leave Flickr. Not using it much at the moment either, mind you
Forum: Macro Photography 05-22-2017, 11:29 PM  
New focus stacking rail
Posted By Nass
Replies: 17
Views: 2,370
Yay, I like that. Nice!
Forum: Flashes, Lighting, and Studio 05-18-2017, 11:22 PM  
Taping up everything except centre pin - safe?
Posted By Nass
Replies: 9
Views: 946
About Ģ55/Ģ60 ish
Forum: Flashes, Lighting, and Studio 05-17-2017, 02:20 AM  
Flash Advice for Macro Studio
Posted By Nass
Replies: 5
Views: 463
One thing, doublecheck the flash you buy that it's got a decent range of manual flash settings. Some will go 1/1 - 1/128 in 1/3 stop settings, but others just allow 1/1 and 1/16. The former obviously gives you more choices.

Beyond that, member automorphism basically hit it on the head. Cables are a pain (but not the end of the world) and you don't need HSS. Fwiw I have found rear-sync useful myself, to prevent ghosting on combines light sources, but that's using a field monitor as background and I don't think too many people do that.

Good luck!
Forum: Macro Photography 05-11-2017, 03:58 PM  
New focus stacking rail
Posted By Nass
Replies: 17
Views: 2,370
Hi Bob,

It does look like a terrific idea indeed, but I don't have one myself. I know of several other competent people trying it out, so let me get back to you with the consensus once there is one! Not sure if I like that it is tied into Helicon though, Zerene is the higher quality package.

-Johan
Forum: Troubleshooting and Beginner Help 05-11-2017, 02:32 PM  
LED ringflash
Posted By Nass
Replies: 8
Views: 725
^^ My experience too. I'm still not aware of any LED light sources at all that have as short a duration as Xenon
Forum: Post Your Photos! 05-11-2017, 12:01 PM  
Macro P-p-p-p-p-p-
Posted By Nass
Replies: 5
Views: 401
Both are fine portraits. There are hints of oversharpening, and the subject could be a bit brighter (ie the stem looks a little dark to me). Still, as portrait studies, bravo!
Forum: Macro Photography 05-08-2017, 08:09 AM  
Macro Lens
Posted By Nass
Replies: 20
Views: 1,186
I do a bit of that sort of stuff. There are many equipment options - have a look at Extreme Macro Photography

Good luck!
Forum: Pentax Camera and Field Accessories 05-06-2017, 02:56 AM  
Assembling the Neutral Density filter team
Posted By Nass
Replies: 11
Views: 690
Reverse ND grad is good for sunrises and sunsets
Forum: Pentax SLR Lens Discussion 04-26-2017, 04:28 PM  
I have an odd question
Posted By Nass
Replies: 46
Views: 1,786
Maybe have a go at identifying which of the contacts transmits focus information, and tape over just that one?
Forum: Pentax Price Watch 04-26-2017, 11:30 AM  
Oddity, Pentax A 100 Dental Macro on Ebay, $459
Posted By Nass
Replies: 11
Views: 1,259
Don't blame you!
Forum: Pentax Price Watch 04-26-2017, 10:36 AM  
Oddity, Pentax A 100 Dental Macro on Ebay, $459
Posted By Nass
Replies: 11
Views: 1,259
459? sheesh
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