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tv lens

stu62
Posted 24/11/2014 - 22:44 Link
Hi folks

Any one out there know any thing about a pentax tv lens and what mount it would be

as i was just wondering if it would fit my k5


Many thanks stu
johnriley
Posted 24/11/2014 - 23:46 Link
If it's a CCTV lens then it might be 25mm screw thread, or C mount as it's known. A simple adapter will allow its use on the Pentax Q cameras, but it would be a bit small to be effective on any of the DSLRs.

I've tried some of these lenses on the Q and the results were just dreadful.
Best regards, John
stu62
Posted 25/11/2014 - 06:18 Link
johnriley wrote:
If it's a CCTV lens then it might be 25mm screw thread, or C mount as it's known. A simple adapter will allow its use on the Pentax Q cameras, but it would be a bit small to be effective on any of the DSLRs.

I've tried some of these lenses on the Q and the results were just dreadful.

Thankks john

I think i will give it a miss then

Regards stu
petrochemist
Posted 25/11/2014 - 12:18 Link
Many CCTV lenses are CS rather than C mount. Exactly the same thread but a further reduced rear focusing distance. Normal C mount must be ~17.5 mm in front of the sensor for infinty focus, CS reduces this by 5mm.
Coverage varies considerably but I don't think any are designed to cover more than a 16mm diagonal, many only cover 8mm.
Neither will be able to focus anywhere near infinity on a DSLR (of any type) but can potentially be used for macro where the increased lens-sensor distance will improve coverage as well.

Results from c-mounts are also very variable, the cheapest usable ones are rather quirky in the swirling bokeh they produce, which can make them usable for 'creative' work.

Pentax CCTV lenses will be amoung the more expensive models.
Mike
.
Pentax:K5ii, 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, Sony & micro 4/3 cameras with various PK mounts, Zenit E...
Far to many tele-converters, adapters, project parts & extension tubes etc.

.[size=11:].FlickrWPFPanoramio

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