Handheld what's a good F to use with SMC Pentax-M 100mm F4 Macro

normhead · 01-27-2021, 07:09 AM

Originally posted by JensE

The SMC Pentax-M 100mm F4 Macro has a nice small 49mm filter thread on a narrow inner tube. With its recessed front element. it doesn't need a hood necessarily. At 1:2, i.e. at 45cm (MFD), there should be at least 20cm in front of the lens.

I maybe the removed is a 1:1 thing. I've definitely had to remover the hood for my Sigma 70 macro, just to achieve focus.

**JensE** · 01-27-2021, 10:06 AM

Quick check on a KP with DFA100mm WR and onboard flash: no shadows at 1:2. At 1:1 no shadow without the hood, about bottom 30% with the hood.

normhead · 01-27-2021, 11:49 AM

Originally posted by JensE

Quick check on a KP with DFA100mm WR and onboard flash: no shadows at 1:2. At 1:1 no shadow without the hood, about bottom 30% with the hood.

Now that's what I was talking about..

VSTAR · 01-31-2021, 12:16 AM - **1 Like**

Originally posted by AstroDave

And whether you are near-sighted. I am 75 (in three weeks) and quite near-sighted (my distance glasses are around -5 diopters; I need to move up closer to make out the big E on the eye-guy's chart). But, I can readily focus at 10-15 cm for close-up work without glasses. (And will threaten to kill my opthalmologist when I need cataract surgery if he refuses to keep that capability! They want to set you up with new for-distance lenses. I haven't been able to see at a distance without glasses since I was 10 years old, so I am used to things as they are.).

Hi AstroDave, from Dave the eye doctor....when you require eye surgery just tell the surgeon that you want to be myopic after the surgery, as to what Rx post-op both of you have to agree on it. And on the day of the surgery again ask the nurse/surgeon what Rx you will end up with. this is routine if the eye surgeon is listening to you, so don't fret it. Best regards, David.

**AstroDave** · 01-31-2021, 09:23 AM

Originally posted by VSTAR

Originally posted by AstroDave Quote
And whether you are near-sighted. I am 75 (in three weeks) and quite near-sighted (my distance glasses are around -5 diopters; I need to move up closer to make out the big E on the eye-guy's chart). But, I can readily focus at 10-15 cm for close-up work without glasses. (And will threaten to kill my opthalmologist when I need cataract surgery if he refuses to keep that capability! They want to set you up with new for-distance lenses. I haven't been able to see at a distance without glasses since I was 10 years old, so I am used to things as they are.).
Hi AstroDave, from Dave the eye doctor....when you require eye surgery just tell the surgeon that you want to be myopic after the surgery, as to what Rx post-op both of you have to agree on it. And on the day of the surgery again ask the nurse/surgeon what Rx you will end up with. this is routine if the eye surgeon is listening to you, so don't fret it. Best regards, David.

THANK YOU - Dave the Eye Guy! I will print this out for future (probably a while yet) reference, but it may be much more relevant for my wife who will be consulting with our eye guy on this in a week or so - she almost certainly needs it now.

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01-27-2021, 07:09 AM	#31
normhead Pentaxian Join Date: Jun 2007 Location: Near Algonquin Park Photos: Gallery \| Albums Posts: 40,448	Originally posted by JensE The SMC Pentax-M 100mm F4 Macro has a nice small 49mm filter thread on a narrow inner tube. With its recessed front element. it doesn't need a hood necessarily. At 1:2, i.e. at 45cm (MFD), there should be at least 20cm in front of the lens. I maybe the removed is a 1:1 thing. I've definitely had to remover the hood for my Sigma 70 macro, just to achieve focus.

01-27-2021, 10:06 AM	#32
JensE Site Supporter Join Date: Dec 2015 Location: Leipzig Photos: Gallery \| Albums Posts: 1,964	Quick check on a KP with DFA100mm WR and onboard flash: no shadows at 1:2. At 1:1 no shadow without the hood, about bottom 30% with the hood.

01-27-2021, 11:49 AM	#33
normhead Pentaxian Join Date: Jun 2007 Location: Near Algonquin Park Photos: Gallery \| Albums Posts: 40,448	Originally posted by JensE Quick check on a KP with DFA100mm WR and onboard flash: no shadows at 1:2. At 1:1 no shadow without the hood, about bottom 30% with the hood. Now that's what I was talking about..

01-31-2021, 12:16 AM - 1 Like	#34
VSTAR Veteran Member Join Date: Mar 2010 Location: Toronto Posts: 390	Originally posted by AstroDave And whether you are near-sighted. I am 75 (in three weeks) and quite near-sighted (my distance glasses are around -5 diopters; I need to move up closer to make out the big E on the eye-guy's chart). But, I can readily focus at 10-15 cm for close-up work without glasses. (And will threaten to kill my opthalmologist when I need cataract surgery if he refuses to keep that capability! They want to set you up with new for-distance lenses. I haven't been able to see at a distance without glasses since I was 10 years old, so I am used to things as they are.). Hi AstroDave, from Dave the eye doctor....when you require eye surgery just tell the surgeon that you want to be myopic after the surgery, as to what Rx post-op both of you have to agree on it. And on the day of the surgery again ask the nurse/surgeon what Rx you will end up with. this is routine if the eye surgeon is listening to you, so don't fret it. Best regards, David.

01-31-2021, 09:23 AM	#35
AstroDave Loyal Site Supporter Join Date: May 2007 Location: Flagstaff, Arizona Posts: 1,637	Originally posted by VSTAR Originally posted by AstroDave Quote And whether you are near-sighted. I am 75 (in three weeks) and quite near-sighted (my distance glasses are around -5 diopters; I need to move up closer to make out the big E on the eye-guy's chart). But, I can readily focus at 10-15 cm for close-up work without glasses. (And will threaten to kill my opthalmologist when I need cataract surgery if he refuses to keep that capability! They want to set you up with new for-distance lenses. I haven't been able to see at a distance without glasses since I was 10 years old, so I am used to things as they are.). Hi AstroDave, from Dave the eye doctor....when you require eye surgery just tell the surgeon that you want to be myopic after the surgery, as to what Rx post-op both of you have to agree on it. And on the day of the surgery again ask the nurse/surgeon what Rx you will end up with. this is routine if the eye surgeon is listening to you, so don't fret it. Best regards, David. THANK YOU - Dave the Eye Guy! I will print this out for future (probably a while yet) reference, but it may be much more relevant for my wife who will be consulting with our eye guy on this in a week or so - she almost certainly needs it now.

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