IR focus register marks


coker

Link Posted 26/07/2018 - 18:17
Does anyone know, would the little red points on man. focus (older) lenses still work on/for digital?
E.g., Pentax 200mm f4 m, 50mm f1.7m, Kiron 28mm f2.....?

Thanks,

Roger.
The more I look, the more there is to see!

tigershoot

Link Posted 26/07/2018 - 18:27
Can't see why not - the sensor is still in the same place as the film used to be i.e. the focal plane.
K3ii, K-5, K-x, DA150-450mm, DA16-85WR, DA16-45, DA18-55WR, DA18-135WR, DA35 F2.4, M100mm F4 Macro, DA55-300mm, FA50mm 1.4, AF360 Flash, AF540 Flash

petrochemist

Link Posted 26/07/2018 - 18:31
As Tigershoot reasoned, they work just the same, but for cameras with live-view thats generally a better option.
I used the IR marks when shoot IR with my k100d.
Mike
.
Pentax:K7, K100D, DA18-55, DA10-17, DA55-300, DA50-200, F100-300, F50, DA35 AL, 4* M50, 2* M135, Helicoid extension, Tak 300 f4 (& 6 film bodies)
3rd Party: Bigmos (Sigma 150-500mm OS HSM),2* 28mm, 100mm macro, 28-200 zoom, 35-80 zoom, 80-200 zoom, 80-210 zoom, 300mm M42, 600 mirror, 1000-4000 scope, 50mm M42, enlarger lenses, micro 4/3 cameras with various PK mounts, Zenit E...
Far to many tele-converters, adapters, project parts & extension tubes etc.

.[size=11:].Flickr WPF Panoramio

coker

Link Posted 26/07/2018 - 19:08
Thanks, Gavin & Mike.

In live view, with the R72 filter on, it's too dark to focus, surely?

Isn't it?

Roger.
The more I look, the more there is to see!

petrochemist

Link Posted 26/07/2018 - 19:19
coker wrote:
Thanks, Gavin & Mike.

In live view, with the R72 filter on, it's too dark to focus, surely?

Isn't it?

Roger.

Not with my 4/3 bodies even the unmodified ones
Mike
.
Pentax:K7, K100D, DA18-55, DA10-17, DA55-300, DA50-200, F100-300, F50, DA35 AL, 4* M50, 2* M135, Helicoid extension, Tak 300 f4 (& 6 film bodies)
3rd Party: Bigmos (Sigma 150-500mm OS HSM),2* 28mm, 100mm macro, 28-200 zoom, 35-80 zoom, 80-200 zoom, 80-210 zoom, 300mm M42, 600 mirror, 1000-4000 scope, 50mm M42, enlarger lenses, micro 4/3 cameras with various PK mounts, Zenit E...
Far to many tele-converters, adapters, project parts & extension tubes etc.

.[size=11:].Flickr WPF Panoramio

redbusa99

Link Posted 26/07/2018 - 23:01
tried on my K3ii and you cannot see a thing. the IR point definitely works , tried that out on my Tamron Adptall 35-70 which has a mark for 35mm and one for 70mm. the 35 IR point is 6mm from standard but the 70 is only 1.5 mm, how you sort out distances between i have no idea. Pentax A70-210 has one mark that slopes through the whole zoom range my other lenses for IR are primes, 24, 28, 90.
K3 II and the odd lens or 2

Flickr

derek897

Link Posted 26/07/2018 - 23:47
Back when I had a converted K01 I used the ir points on my m 28mm, f8 and focus points lined up and was good to go no issues at all.
Same when using the r72nm filter.
I know what i like, If not always why.
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