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Comment by Spad posted on Sigma 10-20mm f3.5 EX DC HSM at 22/06/2025 - 11:00
Thanks Chris, I'll give that a try.
Comment by Spad posted on Sigma AF hunting issue. at 21/06/2025 - 14:37
Has anyone else here got a Sigma 17-50 f2.8 EX DC OS?
I had one delivered today and the AF just hunts, and hunts, and hunts! Occasionally it focuses, mostly at 17mm, but anything above that. It just will not focus!
Tried on both my K5 and K3.... same results on both bodies. Tried all focusing modes. Still no joy.... Also tried with the OS on/off, and body stabilisation on/off....
Has anyone else had an issue with this lens?
I had one delivered today and the AF just hunts, and hunts, and hunts! Occasionally it focuses, mostly at 17mm, but anything above that. It just will not focus!
Tried on both my K5 and K3.... same results on both bodies. Tried all focusing modes. Still no joy.... Also tried with the OS on/off, and body stabilisation on/off....
Has anyone else had an issue with this lens?
Comment by Spad posted on Sigma AF hunting issue. at 21/06/2025 - 12:30
Ignore previous post.... I missread yours Steve!
Lubbyman wrote:
Steve
In that case then a K mount T adaptor on a genuine adaptor should work. As that will give the necessary 55mm back focus.Spad wrote:
Biggest problem will be what is its longest exposure setting or if it has it got a bulb setting?
'Bulb' mode is available if you use a genuine Pentax K-Q adapter, not if a 3rd party adapter is used. The reason is that 'bulb' mode is only available if the lens has a leaf shutter (there is no shutter in the camera itself). The main Q lenses (01, 02, 06 etc) contain a shutter. The genuine Pentax adapter also has a shutter, so the camera believes that any attached K mount lens (and presumably telescope) has a shutter. Non-Pentax K-Q adapters do not have a shutter, so bulb mode is not available with them. Without a shutter in the lens or adapter, the max exposure (via electronic shutter) is 2 sec.Biggest problem will be what is its longest exposure setting or if it has it got a bulb setting?
Steve
Comment by Spad posted on I Photographed the Moon … with the Q S-1 at 20/06/2025 - 14:00
It's not possible to do any galaxy or deep sky work. Min shutter is 30 to 60 secs.
Unless....
The adaptor that Geoff used has a shutter? The mount I presume is either R or EF mount. If that is so, it maybe possible to do it.
Unless....
The adaptor that Geoff used has a shutter? The mount I presume is either R or EF mount. If that is so, it maybe possible to do it.
Comment by Spad posted on I Photographed the Moon … with the Q S-1 at 20/06/2025 - 13:48
If i can get one.... or borrow one... i can give it a shot
Biggest problem will be what is its longest exposure setting or if it has it got a bulb setting?
Biggest problem will be what is its longest exposure setting or if it has it got a bulb setting?
Comment by Spad posted on I Photographed the Moon … with the Q S-1 at 20/06/2025 - 11:48
Lubbyman wrote:
Ahhhh.... ok! I've had a learning experience today! Do not include crop factor! Something I didn't know but in hindsight I should have figured out! Considering I don't do it with my telescopes!!! Spad wrote:
What gets me about this, is the f stop....
600 @ f6.3
So 600mm x2 x2 x4.65 ÷ 95mm equates to an f stop of 117!!!
Nooo... The crop factor (i.e. 4.65) should NOT be included in the calculation of f stop. It's just the equivalent of taking the centre portion of a FF image after having taken the image, the focal length of the lens and the physical aperture are unchanged. The teleconverters do change the focal length so do affect the f stop. The f stop is actually 6.3 x 2 x 2 = 25.2 .What gets me about this, is the f stop....
600 @ f6.3
So 600mm x2 x2 x4.65 ÷ 95mm equates to an f stop of 117!!!
Sorry as well to Geoff!! I implied you were trying to ohotigraph thru a tiny smegging pin hole!
Comment by Spad posted on I Photographed the Moon … with the Q S-1 at 20/06/2025 - 09:36
I saw this yonks ago.... but still thoroughly enjoyed it
What gets me about this, is the f stop....
600 @ f6.3
So 600mm x2 x2 x4.65 ÷ 95mm equates to an f stop of 117!!!
To get an f stop below f5 would need an aperture of over 2200'ish mm
FYI, anything under f5 in the telescope world is classed as fast
What gets me about this, is the f stop....
600 @ f6.3
So 600mm x2 x2 x4.65 ÷ 95mm equates to an f stop of 117!!!
To get an f stop below f5 would need an aperture of over 2200'ish mm
FYI, anything under f5 in the telescope world is classed as fast
Comment by Spad posted on I Photographed the Moon … with the Q S-1 at 20/06/2025 - 07:40
walkeja wrote:
Do camera cases count?
Yes!!Do camera cases count?
Lubbyman wrote:
Steve
Lie naked on the floor rubbing myself with them??? lesjacksons wrote:
☺
... And what you do with them in private. Spad wrote:
Is having 9 camera bags moving towards having a fetish?????
I suppose it depends wether they are full and if so, of what.Is having 9 camera bags moving towards having a fetish?????
☺
Steve
johnriley wrote:
Only nine? I can't help collecting camera bags, they gravitate towards me, the new, the old, the antique.....So don't worry, you are far from a fetish.
I now have a vision of John walking into a camera shop, and all the bags shout "quick.... get him!"Only nine? I can't help collecting camera bags, they gravitate towards me, the new, the old, the antique.....So don't worry, you are far from a fetish.
Comment by Spad posted on I think I am going peculiar.... at 19/06/2025 - 11:07
At £119.00 it is a pretty reasonable price.
I have one these and I love it.