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Forum: Pentax SLR Lens Discussion 01-27-2022, 07:31 PM  
Pentax 94mm f/1.8?
Posted By Pond-Curtis
Replies: 16
Views: 1,389
My bad, I meant 21.64mm radius. It's a very common radius for 35mm.
Forum: Pentax SLR Lens Discussion 01-26-2022, 12:56 PM  
Pentax 94mm f/1.8?
Posted By Pond-Curtis
Replies: 16
Views: 1,389
I was thinking that too but it looks like the image circle is 21.64mm so that's not going to cover more than 35mm.
Forum: Pentax SLR Lens Discussion 01-25-2022, 07:48 PM  
Pentax 94mm f/1.8?
Posted By Pond-Curtis
Replies: 16
Views: 1,389
What originally caught my eye was the very low the distortion and the focusing mechanism is also interesting. I think It's safe to say this has never been manufactured and sold.
Forum: Pentax SLR Lens Discussion 01-25-2022, 02:53 PM  
Pentax 94mm f/1.8?
Posted By Pond-Curtis
Replies: 16
Views: 1,389
"True" isn't what I should have said. I meant that the advertised focal length or maximum aperture can be different from what you get when you do the math. So it's possible that the person who made this database made errors but also companies do lie or round the numbers
Forum: Pentax SLR Lens Discussion 01-25-2022, 12:45 PM  
Pentax 94mm f/1.8?
Posted By Pond-Curtis
Replies: 16
Views: 1,389
Thanks, that's very helpful!
Forum: Pentax SLR Lens Discussion 01-25-2022, 12:44 PM  
Pentax 94mm f/1.8?
Posted By Pond-Curtis
Replies: 16
Views: 1,389
I think they are listed by their true specs since they differ from what a lens is sold as.
Forum: Pentax SLR Lens Discussion 01-25-2022, 10:42 AM  
Pentax 94mm f/1.8?
Posted By Pond-Curtis
Replies: 16
Views: 1,389
This site https://www.photonstophotos.net/GeneralTopics/Lenses/OpticalBench/OpticalBench.htm has a schematic for a "Pentax 94mm 1.8" but I haven't find any info. Maybe it's just from a patent? Regardless, the design interests me and I'd appreciate any info.
Forum: Welcomes and Introductions 01-25-2022, 10:19 AM  
Hi
Posted By Pond-Curtis
Replies: 6
Views: 327
I've been using this site for a while but only just registered today. I shoot digital with mostly manual vintage lenses and like to tinker with adapting and macro. I don't have much pentax gear but I love my super tak 50mm f/1.4.
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