Re: A* 600/5.6 question
Bill wrote:
"Does anyone know if the above mentioned lens needs a filter in the filter drawer to achieve it's maximum magic?
"Thanks"
Bill, the F* and FA* 600 F4 lenses do require a filter as part of the optical system. I would therefore suspect that the A* 600 does also.
Joe
On Jun 28, 2021, at 5:22 PM, jtainter jtainter@mindspring.com wrote:
Bill wrote:
"Does anyone know if the above mentioned lens needs a filter in the filter drawer to achieve it's maximum magic?
"Thanks"
Bill, the F* and FA* 600 F4 lenses do require a filter as part of the optical system. I would therefore suspect that the A* 600 does also.
I just had a look at the optical diagrams on the K-Mount Page. The F / FA optical diagram shows the filter as part of the optics but the A* 600/5.6 doesn't. I certainly wouldn't take that as gospel as I don't know where those diagrams come from. I'd tend to assume that any lens with a filter drawer would need the filter. Clear as mud :D
Cheers,
Dave
On 6/28/2021 1:49 AM, David Mann wrote:
On Jun 28, 2021, at 5:22 PM, jtainter jtainter@mindspring.com wrote:
Bill wrote:
"Does anyone know if the above mentioned lens needs a filter in the filter drawer to achieve it's maximum magic?
"Thanks"
Bill, the F* and FA* 600 F4 lenses do require a filter as part of the optical system. I would therefore suspect that the A* 600 does also.
I just had a look at the optical diagrams on the K-Mount Page. The F / FA optical diagram shows the filter as part of the optics but the A* 600/5.6 doesn't. I certainly wouldn't take that as gospel as I don't know where those diagrams come from. I'd tend to assume that any lens with a filter drawer would need the filter. Clear as mud :D
Cheers,
Dave
Interesting note about the optical diagram. I've had the question
about filters on the A* 400 f2.8 and its optical diagram does show a
filter in place. never thought to check that. I always used a UV filter
with that lens but wondered if it was really needed.
Mark
Every lens I’ve had that had a filter tray or internal filter mount like this has required a matched thickness filter in the tray to achieve their best performance. Even my Sigma 600mm reflex does.
G
On Jun 28, 2021, at 3:19 PM, Mark C pdml-mark@charter.net wrote:
On 6/28/2021 1:49 AM, David Mann wrote:
On Jun 28, 2021, at 5:22 PM, jtainter jtainter@mindspring.com wrote:
Bill wrote:
"Does anyone know if the above mentioned lens needs a filter in the filter drawer to achieve it's maximum magic?
"Thanks"Bill, the F* and FA* 600 F4 lenses do require a filter as part of the optical system. I would therefore suspect that the A* 600 does also.
I just had a look at the optical diagrams on the K-Mount Page. The F / FA optical diagram shows the filter as part of the optics but the A* 600/5.6 doesn't. I certainly wouldn't take that as gospel as I don't know where those diagrams come from. I'd tend to assume that any lens with a filter drawer would need the filter. Clear as mud :DCheers,
Dave
Interesting note about the optical diagram. I've had the question about filters on the A* 400 f2.8 and its optical diagram does show a filter in place. never thought to check that. I always used a UV filter with that lens but wondered if it was really needed.
Mark
On Mon., Jun. 28, 2021, 4:19 p.m. Mark C, pdml-mark@charter.net wrote:
On 6/28/2021 1:49 AM, David Mann wrote:
On Jun 28, 2021, at 5:22 PM, jtainter jtainter@mindspring.com wrote:
Bill wrote:
"Does anyone know if the above mentioned lens needs a filter in the
filter drawer to achieve it's maximum magic?
"Thanks"
Bill, the F* and FA* 600 F4 lenses do require a filter as part of the
optical system. I would therefore suspect that the A* 600 does also.
I just had a look at the optical diagrams on the K-Mount Page. The F /
FA optical diagram shows the filter as part of the optics but the A*
600/5.6 doesn't. I certainly wouldn't take that as gospel as I don't know
where those diagrams come from. I'd tend to assume that any lens with a
filter drawer would need the filter. Clear as mud :D
Cheers,
Dave
Interesting note about the optical diagram. I've had the question
about filters on the A* 400 f2.8 and its optical diagram does show a
filter in place. never thought to check that. I always used a UV filter
with that lens but wondered if it was really needed.
Mark
My A* 600/5.6 (I like being able to say that) came with a huge Tamron clear
filter. Probably a UV. It was a sharpness killer. I took it off and the
lens is a lot better.
I suppose I should toss a filter into the drawer and see what happens.
Bill
On Mon, Jun 28, 2021 at 08:13:19PM -0600, Bill wrote:
My A* 600/5.6 (I like being able to say that) came with a huge Tamron clear
filter. Probably a UV. It was a sharpness killer. I took it off and the
lens is a lot better.
I suppose I should toss a filter into the drawer and see what happens.
Bill
I've got a couple of lenses (A* 300/2.8, FA* 250-600/5.6) that have the
filter holders. Somehow my little sleeve of filters for the 250-600 got
lost fairly early on (probably at a race weekend), so for most of my
shots with that lens there's been nothing in the filter holder. I keep
telling myself to see if I can get a compatible filter to mount there.
I can't say I've noticed any degradation. There again most of the time
I'm using that lens on a monopod to track moving targets, so it hasn't
had an absolutely rigid platform.